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103-471: Lepimenes epithymum ( L. ) Raf. Cuscuta europaea var. epithymum L. Cuscuta epithymum ( dodder , lesser dodder , hellweed , strangle-tare ) is a parasitic plant assigned to the family Cuscutaceae or Convolvulaceae , depending on the taxonomy . It is red-pigmented, not being photosynthetically active. It has a filiform habit, like a group of yarns . Its leaves are very small, like flakes. Its flowers , disposed in little glomerules, have

206-542: A "disagreement" with Rudbeck's wife and had to move out of his mentor's house; his relationship with Rudbeck did not appear to suffer. That Christmas, Linnaeus returned home to Stenbrohult to visit his parents for the first time in about three years. His mother had disapproved of his failing to become a priest, but she was pleased to learn he was teaching at the University. During a visit with his parents, Linnaeus told them about his plan to travel to Lapland ; Rudbeck had made

309-479: A catalogue of the botanical holdings in the herbarium and botanical garden of Hartekamp. He wrote it in nine months (completed in July 1737), but it was not published until 1738. It contains the first use of the name Nepenthes , which Linnaeus used to describe a genus of pitcher plants . Linnaeus stayed with Clifford at Hartekamp until 18 October 1737 (new style), when he left the house to return to Sweden. Illness and

412-446: A chemical shock. The osmotic changes that occur as a result are characterized by increased quantities of osmotically active material and induce the cell metaplasia and gall formation. When the chemical shock is of high intensity, metaplasia does not occur. Instead, the plant cells local to the shock die, thereby rejecting the insect and defending the plant tissue. Galls are rich in resins and tannic acid and have been used widely in

515-466: A child's talents than develop them". Two years after his tutoring had begun, he was sent to the Lower Grammar School at Växjö in 1717. Linnaeus rarely studied, often going to the countryside to look for plants. At some point, his father went to visit him and, after hearing critical assessments by his preceptors, he decided to put the youth as an apprentice to some honest cobbler. He reached

618-643: A collector of natural history, and to see his cabinet , as well as to visit the Chelsea Physic Garden and its keeper, Philip Miller . He taught Miller about his new system of subdividing plants, as described in Systema Naturae . At first, Miller was reluctant to use the new binomial nomenclature , preferring instead the classifications of Joseph Pitton de Tournefort and John Ray . Nevertheless, Linnaeus applauded Miller's Gardeners Dictionary . The conservative Miller actually retained in his dictionary

721-430: A copy of Sir Hans Sloane's Natural History of Jamaica , a rare book, if he let Linnaeus stay with him, and Burman accepted. On 24 September 1735, Linnaeus moved to Hartekamp to become personal physician to Clifford, and curator of Clifford's herbarium. He was paid 1,000 florins a year, with free board and lodging. Though the agreement was only for a winter of that year, Linnaeus practically stayed there until 1738. It

824-555: A curriculum designed for boys preparing for the priesthood. In the last year at the gymnasium, Linnaeus's father visited to ask the professors how his son's studies were progressing; to his dismay, most said that the boy would never become a scholar. Rothman believed otherwise, suggesting Linnaeus could have a future in medicine. The doctor offered to have Linnaeus live with his family in Växjö and to teach him physiology and botany. Nils accepted this offer. Rothman showed Linnaeus that botany

927-560: A director of the Dutch East India Company and the owner of a rich botanical garden at the estate of Hartekamp in Heemstede . Clifford was very impressed with Linnaeus's ability to classify plants, and invited him to become his physician and superintendent of his garden. Linnaeus had already agreed to stay with Burman over the winter, and could thus not accept immediately. However, Clifford offered to compensate Burman by offering him

1030-529: A dissertation, written back in Sweden, entitled Dissertatio medica inauguralis in qua exhibetur hypothesis nova de febrium intermittentium causa , in which he laid out his hypothesis that malaria arose only in areas with clay-rich soils. Although he failed to identify the true source of disease transmission, (i.e., the Anopheles mosquito ), he did correctly predict that Artemisia annua ( wormwood ) would become

1133-456: A family, he received permission to marry his fiancée, Sara Elisabeth Moræa. Their wedding was held 26 June 1739. Seventeen months later, Sara gave birth to their first son, Carl . Two years later, a daughter, Elisabeth Christina , was born, and the subsequent year Sara gave birth to Sara Magdalena, who died when 15 days old. Sara and Linnaeus would later have four other children: Lovisa, Sara Christina, Johannes and Sophia. In May 1741, Linnaeus

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1236-476: A naturalist." Linnaeus has been called Princeps botanicorum (Prince of Botanists) and "The Pliny of the North". He is also considered one of the founders of modern ecology . In botany, the abbreviation L. is used to indicate Linnaeus as the authority for a species' name. In zoology, the abbreviation Linnaeus is generally used; the abbreviations L., Linnæus and Linné are also used. In older publications,

1339-472: A new benefactor, Olof Celsius , who was a professor of theology and an amateur botanist. He received Linnaeus into his home and allowed him use of his library, which was one of the richest botanical libraries in Sweden. In 1729, Linnaeus wrote a thesis, Praeludia Sponsaliorum Plantarum on plant sexual reproduction . This attracted the attention of Rudbeck; in May 1730, he selected Linnaeus to give lectures at

1442-564: A number of pre-Linnaean binomial signifiers discarded by Linnaeus but which have been retained by modern botanists. He only fully changed to the Linnaean system in the edition of The Gardeners Dictionary of 1768. Miller ultimately was impressed, and from then on started to arrange the garden according to Linnaeus's system. Linnaeus also travelled to Oxford University to visit the botanist Johann Jacob Dillenius . He failed to make Dillenius publicly fully accept his new classification system, though

1545-427: A nutritive cellular layer. In a general gall wasp gall, the outermost layer is the epidermis followed by outer cortex and then inner cortex. In some galls these two cortex layers are separated by a lignified layer. The innermost part of a gall is the larval chamber. The nutritive layer is situated between the larval chamber and the inner cortex. There is a nutritional gradient (high to low) from inside to outside of

1648-611: A physician, and thus to make it possible to support a family. Once again, Linnaeus found a patron; he became acquainted with Count Carl Gustav Tessin , who helped him get work as a physician at the Admiralty. During this time in Stockholm, Linnaeus helped found the Royal Swedish Academy of Science ; he became the first Praeses of the academy by drawing of lots. Because his finances had improved and were now sufficient to support

1751-556: A practical way, making this the first proto-modern Flora . The account covered 534 species, used the Linnaean classification system and included, for the described species, geographical distribution and taxonomic notes. It was Augustin Pyramus de Candolle who attributed Linnaeus with Flora Lapponica as the first example in the botanical genre of Flora writing. Botanical historian E. L. Greene described Flora Lapponica as "the most classic and delightful" of Linnaeus's works. It

1854-605: A range of colors (red, green, yellow, and black). Different taxonomic groups of gall inducers vary in the complexity and diversity of gall formation and organization, with insect induced galls generally being more complex and diverse. Additionally, gall frequency varies based on factors such as weather, plant susceptibility, and pest populations. There are four stages of gall development: initiation, growth and differentiation, maturation, and dehiscence. Gall tissues are nutritive and present high concentrations of lipids, proteins, nitrogen, and other nutrients. The formation of galls which

1957-642: A range of colors (red, green, yellow, and black). Different taxonomic groups of gall inducers vary in the complexity and diversity of gall formation and organization, with insect induced galls generally being more complex and diverse. Additionally, gall frequency varies based on factors such as weather, plant susceptibility, and pest populations. There are four stages of gall development: initiation, growth and differentiation, maturation, and dehiscence. Gall tissues are nutritive and present high concentrations of lipids, proteins, nitrogen, and other nutrients. The formation of galls begins with insect saliva on plants inducing

2060-566: A small group of students to Dalarna . Funded by the Governor of Dalarna, the expedition was to catalogue known natural resources and discover new ones, but also to gather intelligence on Norwegian mining activities at Røros . His relations with Nils Rosén having worsened, Linnaeus accepted an invitation from Claes Sohlberg, son of a mining inspector, to spend the Christmas holiday in Falun , where Linnaeus

2163-462: A source of antimalarial medications. Within two weeks he had completed his oral and practical examinations and was awarded a doctoral degree. That summer Linnaeus reunited with Peter Artedi , a friend from Uppsala with whom he had once made a pact that should either of the two predecease the other, the survivor would finish the decedent's work. Ten weeks later, Artedi drowned in the canals of Amsterdam , leaving behind an unfinished manuscript on

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2266-452: A thesis along with Frederick Lindberg, a physician student, based on their experiences. In the tradition of the period, this dissertation was essentially an idea of the presiding reviewer ( prases ) expounded upon by the student. Linnaeus's dissertation was translated into French by J. E. Gilibert in 1770 as La Nourrice marâtre, ou Dissertation sur les suites funestes du nourrisage mercénaire . Linnaeus suggested that children might absorb

2369-588: A white corolla , with the androecium welded to the corolla. In Eurasia , this species of dodder would often attach itself to the Conehead thyme ( Thymus capitatus ), taking on the plant's pungency. This gave rise to its specific name, which means upon thyme and from whence it also derived its host's Arabic name, al-ṣaʿitrah . C.epithymum is a rootless holoparasitic plant. It has thin (0.25–0.40 mm) hairless filiform (thread-like) stems that are pink, red, yellow or purple. Its leaves are very small and scale-like on

2472-530: A wild rice, produces an edible gall highly valued as a food source in the Zhejiang and Jiangsu provinces of China. Gall-causing bacteria include Agrobacterium tumefaciens and Pseudomonas savastanoi . Gall forming virus was found on rice plants in central Thailand in 1979 and named rice gall dwarf. Symptoms consisted of gall formation along leaf blades and sheaths, dark green discoloration, twisted leaf tips, and reduced numbers of tillers. Some plants died in

2575-428: Is controlled by the insect. Galls act as both the habitat and food source for the maker of the gall. The interior of a gall can contain edible nutritious starch and other tissues. Some galls act as "physiologic sinks", concentrating resources in the gall from the surrounding plant parts. Galls may also provide the insect with physical protection from predators. Insect galls are usually induced by chemicals injected by

2678-447: Is induction begins with insect saliva on plants. Insect saliva contains various chemicals, induces shock and osmotic changes in the host plant cell. The severity of insect feeding injures the plant varies depending on the insect. The osmotic changes that occur as a result are characterized by increased quantities of osmotically active material and induce the cell metaplasia and gall formation. Gall growth occurs gradually over time, with

2781-425: Is influenced by plant vigor and module size, with larger, fast-growing plant modules resulting in larger galls. Conversely, galls are easily induced on smaller plant modules. Galls are unique growths on plants, and how the plant's genetic instructions could produce these structures in response to external factors is still a fresh field of science. Genetic mechanisms of gall formation is a unique interplay between

2884-446: The Beast of Revelation . Even at the risk of incurring the mayor's wrath, Linnaeus made his observations public, dashing the mayor's dreams of selling the hydra for an enormous sum. Linnaeus and Sohlberg were forced to flee from Hamburg. Linnaeus began working towards his degree as soon as he reached Harderwijk , a university known for awarding degrees in as little as a week. He submitted

2987-984: The Order of the Polar Star , the first civilian in Sweden to become a knight in this order. He was then seldom seen not wearing the order's insignia. Gall Galls develop on various plant organs, providing nutrition and shelter to inducing insects. Galls display vast variation in morphology , size, and wall composition. The size of insect galls can range significantly, from approximately two inches in diameter to less than one-sixteenth of an inch. Some galls are so small that they are merely slightly thickened patches on leaves. Their shape can range from spherical to bursiform, bullet-shaped, flower-shaped, cylindrical, or diamond-like. Factors influencing gall morphology include plant species, tissue type, gall-inducing agent, and environmental conditions. They typically exhibit symmetrical forms, although their end shapes vary due to differences in

3090-490: The curate of the small village of Stenbrohult in Småland. Christina was the daughter of the rector of Stenbrohult, Samuel Brodersonius. A year after Linnaeus's birth, his grandfather Samuel Brodersonius died, and his father Nils became the rector of Stenbrohult. The family moved into the rectory from the curate's house. Even in his early years, Linnaeus seemed to have a liking for plants, flowers in particular. Whenever he

3193-418: The larvae of the insects into the plants and possibly mechanical damage. After the galls are formed, the larvae develop inside until fully grown, when they leave. To form galls, the insects must take advantage of the time when plant cell division occurs quickly: the growing season, usually spring in temperate climates, but which is extended in the tropics. The meristems , where plant cell division occurs, are

Cuscuta epithymum - Misplaced Pages Continue

3296-614: The woolly aphid Adelges abietis , which parasitises coniferous trees such as the Sitka spruce and the Norway spruce. Some dipteran flies such as the cecidomyiid gall midges Dasineura investita and Neolasioptera boehmeriae , and some Agromyzidae leaf-miner flies cause galls. Mites, small arachnids, cause distinctive galls in plants such as the lime tree . Nematodes are microscopic worms that live in soil. Some nematodes ( Meloidogyne species or root-knot nematodes ) cause galls on

3399-567: The Scottish doctor Isaac Lawson , the manuscript was published as Systema Naturae (1735). Linnaeus became acquainted with one of the most respected physicians and botanists in the Netherlands, Herman Boerhaave , who tried to convince Linnaeus to make a career there. Boerhaave offered him a journey to South Africa and America, but Linnaeus declined, stating he would not stand the heat. Instead, Boerhaave convinced Linnaeus that he should visit

3502-547: The Swedish province of Västergötland . He set out from Uppsala on 12 June and returned on 11 August. On the expedition his primary companion was Erik Gustaf Lidbeck, a student who had accompanied him on his previous journey. Linnaeus described his findings from the expedition in the book Wästgöta-Resa , published the next year. After he returned from the journey, the Government decided Linnaeus should take on another expedition to

3605-490: The University although the young man was only a second-year student. His lectures were popular, and Linnaeus often addressed an audience of 300 people. In June, Linnaeus moved from Celsius's house to Rudbeck's to become the tutor of the three youngest of his 24 children. His friendship with Celsius did not wane and they continued their botanical expeditions. Over that winter, Linnaeus began to doubt Tournefort's system of classification and decided to create one of his own. His plan

3708-521: The abbreviation "Linn." is found. Linnaeus's remains constitute the type specimen for the species Homo sapiens following the International Code of Zoological Nomenclature , since the sole specimen that he is known to have examined was himself. Linnaeus was born in the village of Råshult in Småland , Sweden, on 23 May 1707. He was the first child of Nicolaus (Nils) Ingemarsson (who later adopted

3811-425: The adult exits either by chewing its way out or utilizing an opening created by the larval stage. Conversely, insects with sucking mouthparts rely on partially open galls or those that naturally open to facilitate emergence. An example of the latter type is the aphid, which forms marble-sized galls on the leaf stems of cottonwood trees. While these galls have thin walls, they harbor entire colonies of aphids within. When

3914-534: The age of 17, Linnaeus had become well acquainted with the existing botanical literature. He remarks in his journal that he "read day and night, knowing like the back of my hand, Arvidh Månsson's Rydaholm Book of Herbs, Tillandz's Flora Åboensis, Palmberg's Serta Florea Suecana, Bromelii's Chloros Gothica and Rudbeckii's Hortus Upsaliensis". Linnaeus entered the Växjö Katedralskola in 1724, where he studied mainly Greek , Hebrew , theology and mathematics ,

4017-442: The botanist Johannes Burman . After his visit, Burman, impressed with his guest's knowledge, decided Linnaeus should stay with him during the winter. During his stay, Linnaeus helped Burman with his Thesaurus Zeylanicus . Burman also helped Linnaeus with the books on which he was working: Fundamenta Botanica and Bibliotheca Botanica . In August 1735, during Linnaeus's stay with Burman, he met George Clifford III ,

4120-424: The class of organisms. Linnaeus published Species Plantarum , the work which is now internationally accepted as the starting point of modern botanical nomenclature , in 1753. The first volume was issued on 24 May, the second volume followed on 16 August of the same year. The book contained 1,200 pages and was published in two volumes; it described over 7,300 species. The same year the king dubbed him knight of

4223-409: The classification of fish. One of the first scientists Linnaeus met in the Netherlands was Johan Frederik Gronovius , to whom Linnaeus showed one of the several manuscripts he had brought with him from Sweden. The manuscript described a new system for classifying plants. When Gronovius saw it, he was very impressed, and offered to help pay for the printing. With an additional monetary contribution by

Cuscuta epithymum - Misplaced Pages Continue

4326-484: The developing gall wasp larva. The defense-related genes are found to be suppressed in inner gall tissues as a strategy to accommodate the feeding activity of the parasite. Plant galls are caused by a wide range of organisms, including animals such as insects, mites, and nematodes; fungi; bacteria; viruses; and other plants. Insect galls are the highly distinctive plant structures formed by some herbivorous insects as their own microhabitats. They are plant tissue which

4429-519: The efficacy of resistance genes deployed in agriculture. The evolutionary arms race between plants and parasites, underscored by the expansion of gene families involved in biotic interactions, shapes their genomic landscape, influencing their adaptive strategies and diversification. Crown galls formed under the influence of the bacterium Agrobacterium tumefaciens exhibit several distinctive characteristics when compared to other types of galls. This bacterium transfers genetic material known as T-DNA into

4532-584: The establishment of metaplasied cells and localized metabolic changes to repair the wound and neutralize stress. Osmotic stress leads to the development of metaplasied cells, characterized by increased quantities of osmotically active material. The rejection response by the plant triggers the synthesis of defense compounds and enzymes . There are two primary categories of galls: closed and open. Insects such as wasps, moths, and flies, possessing chewing mouthparts during their adult or larval stages, typically inhabit completely enclosed galls. Upon reaching maturity,

4635-440: The expedition were later published in Öländska och Gothländska Resa , written in Swedish. Like Flora Lapponica , it contained both zoological and botanical observations, as well as observations concerning the culture in Öland and Gotland. During the summer of 1745, Linnaeus published two more books: Flora Suecica and Fauna Suecica . Flora Suecica was a strictly botanical book, while Fauna Suecica

4738-411: The family name Linnaeus) and Christina Brodersonia. His siblings were Anna Maria Linnæa, Sofia Juliana Linnæa, Samuel Linnæus (who would eventually succeed their father as rector of Stenbrohult and write a manual on beekeeping ), and Emerentia Linnæa. His father taught him Latin as a small child. One of a long line of peasants and priests, Nils was an amateur botanist , a Lutheran minister , and

4841-422: The first edition of his Systema Naturae in the Netherlands. He then returned to Sweden where he became professor of medicine and botany at Uppsala. In the 1740s, he was sent on several journeys through Sweden to find and classify plants and animals. In the 1750s and 1760s, he continued to collect and classify animals, plants, and minerals, while publishing several volumes. By the time of his death in 1778, he

4944-544: The flora and fauna in the vicinity of Uppsala. Linnaeus published Philosophia Botanica in 1751. The book contained a complete survey of the taxonomy system he had been using in his earlier works. It also contained information of how to keep a journal on travels and how to maintain a botanical garden. During Linnaeus's time it was normal for upper class women to have wet nurses for their babies. Linnaeus joined an ongoing campaign to end this practice in Sweden and promote breast-feeding by mothers. In 1752 Linnaeus published

5047-414: The gall while defense gradient to the opposite direction. Gall morphogenesis involves the regulation of the organ on which the gall occurs while maintaining differentiation freedom. Gall development begins from a single or group of metaplasied cells and progresses through promoter-mediated cell expansion, cell multiplication, programmed differentiation, and control of symmetry. Plant response involves

5150-503: The glasshouse in the later stages of infection. The causal agent was transmitted by the hemipteran bug Nephotettix nigropictus after an incubation of two weeks. Polyhedral particles of 65 nm diameter in the cytoplasm of phloem cells were always associated with the disease. No serologic relationship was found between this virus and that of rice dwarf. The hemiparasitic plant mistletoe forms woody structures sometimes called galls on its hosts. More complex interactions are possible;

5253-435: The host. The stems of the parasite are tightly coiled around the host while other stems remain loosely coiled, allowing them to seek out other parts of the host or a new host. The plant flowers and is either pollinated by insects or, if necessary, is self-pollinated. The seeds are dispersed on the ground beneath the host to await future germination. On some perennial hosts it forms small galls , where parasitic tissue can survive

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5356-730: The import of contaminated seed from crops that it parasitizes, such as alfalfa. C.epithymum parasitizes a wide range of plant species. In Hungary alone it has 391 different host species, 191 of which it was the only Cuscuta species to parasitize. The commonest (>20% affected) host plants are Achillea millefolium (Yarrow), Galium verum (Lady's bedstraw), Arrhenatherum elatius (False oat grass), Plantago lanceolata (Ribwort plantain), Lotus corniculatus (Bird's foot trefoil), Sanguisorba minor (Salad burnet), Festuca rupicola (Furrowed fescue), Teucrium chamaedrys (Wall germander), Daucus carota (Wild carrot) and Convolvulus arvensis (Field bindweed). In northwestern Europe

5459-803: The initial defense layer of plant cells, activated upon detection of "danger signals." These signals, termed damage-associated-molecular-patterns (DAMPs) if originating from the plant or microbe/pathogen-associated-molecular-patterns (MAMPs, PAMPs, or HAMPs) if from the parasite, engage pattern-recognition receptors (PRRs) triggering signaling cascades. PRRs, classified as receptor-like kinases (RLKs), mediate intercellular communication by bridging external stimuli with intracellular defense mechanisms. Antagonists, employing effector-triggered susceptibility (ETS) manipulate host-cell functions through effector molecules encoded by effector genes, aiming primarily at suppressing plant defenses. Notably, some effectors exploit plant traits, known as "plant susceptibility traits," diverting

5562-877: The journey in 1695, but the detailed results of his exploration were lost in a fire seven years afterwards. Linnaeus's hope was to find new plants, animals and possibly valuable minerals. He was also curious about the customs of the native Sami people , reindeer-herding nomads who wandered Scandinavia's vast tundras. In April 1732, Linnaeus was awarded a grant from the Royal Society of Sciences in Uppsala for his journey. Linnaeus began his expedition from Uppsala on 12 May 1732, just before he turned 25. He travelled on foot and horse, bringing with him his journal, botanical and ornithological manuscripts and sheets of paper for pressing plants. Near Gävle he found great quantities of Campanula serpyllifolia , later known as Linnaea borealis ,

5665-577: The kindness of Dutch friends obliged him to stay some months longer in Holland. In May 1738, he set out for Sweden again. On the way home, he stayed in Paris for about a month, visiting botanists such as Antoine de Jussieu . After his return, Linnaeus never again left Sweden. When Linnaeus returned to Sweden on 28 June 1738, he went to Falun , where he entered into an engagement to Sara Elisabeth Moræa . Three months later, he moved to Stockholm to find employment as

5768-524: The last year of the Lower School when he was fifteen, which was taught by the headmaster, Daniel Lannerus, who was interested in botany. Lannerus noticed Linnaeus's interest in botany and gave him the run of his garden. He also introduced him to Johan Rothman, the state doctor of Småland and a teacher at Katedralskolan (a gymnasium ) in Växjö. Also a botanist, Rothman broadened Linnaeus's interest in botany and helped him develop an interest in medicine. By

5871-490: The length, breadth, and height of the galls increasing proportionally. The growth rate is maximal during the insect's early developmental stages and slows as it approaches adulthood. Hormones like auxins play a crucial role in gall growth. The presence of stress and insect secretions stimulates the synthesis of growth-promoting substances, possibly involving a combination of different growth promoters like auxins and kinins. Gall growth involves both cell enlargement and division, but

5974-409: The main host species are dry heathland species such as Ulex europaeus (Gorse), Clover and Calluna vulgaris (Common heather). In Spain it parasitizes Hormathophylla spinosa (Spiny madwort). C.epithymum is generally regarded as annual and grows from seeds that germinate when conditions are right. The seeds have evidence of both physiological and physical dormancy, allowing them to survive in

6077-526: The manufacturing of permanent inks (such as iron gall ink ) and astringent ointments, in dyeing , and in leather tanning . The Talmud records using gallnuts as part of the tanning process as well as a dye-base for ink. Medieval Arabic literature records many uses for the gall, called ˁafṣ in Arabic. The Aleppo gall , found on oak trees in northern Syria , was among the most important exports from Syria during this period, with one merchant recording

6180-521: The number, grouping and structure of the flowers. As a native species C.epithymum occurs from Macaronesia in the west throughout most of Europe to as far east as Xinjiang in Northwest China . It is also present in parts of western North Africa . C.epithymum has been unintentionally introduced into North and South America, Southern Africa, Australia, New Zealand and Primorsky Krai (southeastern Russia). Such introductions probably occurred from

6283-423: The outer gall transcriptome resembles that of twigs, leaf buds, and reproductive structures, the inner gall transcriptome is distinct from normal oak tissues, underscoring the complexity of gall formation. Furthermore, there is an upregulation of genes related to sugar and amino acid metabolism in both outer and inner gall tissues, suggesting a role in transporting plant metabolites to support the nutritional needs of

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6386-406: The parasite and the host plant in shaping the developmental trajectory of the gall organ. The 'zigzag' model introduced by Jones & Dangl (2006) demonstrates the molecular interactions underlying gall induction. This model, refined over time and subject to ongoing enhancements, illustrates the intricate dynamics between antagonistic molecular players. Pattern-triggered immunity (PTI), constitutes

6489-489: The parasitic plant Cassytha filiformis sometimes preferentially feeds on galls induced by the cynipid wasp Belonocnema treatae . Insects induce the formation of galls on plants from which they receive various services, such as a source of nutrition and a place to lay eggs, develop, and be provided protection from the environment and enemies. The gall producers are specific to specific plants, thus inducing galls with unique appearances (balls, knobs, lumps, warts, etc.) and

6592-455: The personality of their wet nurse through the milk. He admired the child care practices of the Lapps and pointed out how healthy their babies were compared to those of Europeans who employed wet nurses. He compared the behaviour of wild animals and pointed out how none of them denied their newborns their breastmilk. It is thought that his activism played a role in his choice of the term Mammalia for

6695-529: The physical actions and chemical stimuli of different insects. Around 90% of galls occur on the leaves of dicotyledons . Galls can develop on various parts of the host plant, such as roots, leaf bases, branches, or leaflets. Internally, galls also exhibit diverse structures. Some are simple, comprising only outgrown and curved leaf tissues, while others feature complex, hierarchical arrangements with multiple chambers containing different types of tissues, including collenchyma , parenchyma , physalides-parenchyma, and

6798-596: The plant and causing growth suppression elsewhere. The bacteria possess virulence genes that control their ability to colonize plants and produce cytokinins, which influence plant growth. While parasitic gall-inducers are typically harmful to plants, researchers are exploring ways to harness their growth-promoting abilities for agricultural benefit. Some derivatives of R. fascians are being investigated for their potential to promote balanced plant growth, and scientists are also studying plant interactions with these bacteria to discover traits that could enhance crop yields. Most of

6901-510: The plant cells, where it becomes integrated into the chromosomes . The T-DNA contains genes that encode for production of auxin, cytokinin and opines. As a result, the infected plant cells undergo rapid multiplication, essentially transforming into "bacterial factories" that produce more bacterial bodies. Certain bacteria, like Rhodococcus fascians , induce the formation of leafy galls on plants, affecting their growth. These galls act as permanent sinks, diverting nutrients away from other parts of

7004-601: The plant's resources in favor of the parasite. Effectoromics, involving high-throughput expression screens, aids in identifying effector candidates crucial for colonization. Conversely, Effector-Triggered Immunity (ETI) responsible for plant's counterattack, leveraging effectors as "danger signals" to render the parasite avirulent. During ETI, nucleotide-binding domain leucine-rich repeat (NLR)-containing receptors detect perturbations induced by effectors, leading to downstream signaling events that promote defense responses. However, parasites can counteract ETI by modifying ETS, undermining

7107-455: The quality of its ferruginous water. The journey was successful, and Linnaeus's observations were published the next year in Skånska Resa . In 1750, Linnaeus became rector of Uppsala University, starting a period where natural sciences were esteemed. Perhaps the most important contribution he made during his time at Uppsala was to teach; many of his students travelled to various places in

7210-519: The roots of susceptible plants. The galls are often small. Many rust fungi induce gall formation, including western gall rust , which infects a variety of pine trees and cedar-apple rust . Galls are often seen in Millettia pinnata leaves and fruits. Leaf galls appear like tiny clubs; however, flower galls are globose. Exobasidium often induces spectacular galls on its hosts. The fungus Ustilago esculenta associated with Zizania latifolia ,

7313-405: The soil for several years. Shoots must find a host plant quickly as the seed contains only minimal nutrition. Once the shoot has found a host plant it quickly climbs over it, twisting in a counter-clockwise fashion around the host stems. It then tightens and sends out haustoria that penetrate through the epidermis into the underlying xylem , allowing the parasite to draw both water and nutrients from

7416-561: The southernmost province Scania . This journey was postponed, as Linnaeus felt too busy. In 1747, Linnaeus was given the title archiater , or chief physician, by the Swedish king Adolf Frederick —a mark of great respect. The same year he was elected member of the Academy of Sciences in Berlin . In the spring of 1749, Linnaeus could finally journey to Scania , again commissioned by the government. With him he brought his student Olof Söderberg. On

7519-536: The specific factors triggering cell enlargement remain unclear. The earliest impact from the insect leads to metaplasia in the affected cells, where they undergo changes in structure and function. When the chemical shock is of high intensity, metaplasia does not occur. Instead, the plant cells local to the shock die, thereby rejecting the insect and defending the plant tissue. Enzymes like invertases are involved in gall growth, with greater activity correlating with stronger gall development. Gall-inducing insect performance

7622-480: The stems. It attaches to the host plant via haustoria . The flowers are white or pink in groups of 7–25, growing directly on the stems. The flowers have five petals and sepals . The petals are joined together forming a cup-like corolla, which is longer than the sepals. The flowers are replaced by small round fruits topped with withered petals. The fruits contain up to four seeds, each about 1 mm long. Six different varieties of C.epithymum have been described, based on

7725-469: The time is right, a slit appears on one side of the gall, allowing the aphids to escape as the slit's lips unfold. Insects induce the formation of galls on plants from which they receive various services, such as a source of nutrition and a place to lay eggs, develop, and be provided protection from the environment and enemies. The gall producers are specific to specific plants, thus inducing galls with unique appearances (balls, knobs, lumps, warts, etc.) and

7828-406: The tissue-specific gene expression. There are substantial differences in  gene expression between inner and outer gall tissues compared to adjacent leaf tissues. Notably, approximately 28% of oak genes display differential expression in the gall compared to leaves, indicating significant transcriptional changes associated with gall development. According to the transcriptome analysis , while

7931-410: The transcriptomic studies on plant galls used entire gall samples resulting both gall and non-gall cells leading to thousands of gene expressions during gall development. Recent studies on gall induced by gall wasps (Hymenoptera: Cynipidae) Dryocosmus quercuspalustris on northern red oak ( Quercus rubra L. ) leaves demonstrate the complexity of genetic mechanisms underlying galls by quantifying

8034-452: The transmission of plant viruses to crops, including sugar beet and potato. Control of this parasite is by a mixture of prevention, such as the removal of dodder seeds from the crop seeds, mechanical control, such as by shallow tillage and biological control, using fungi such as colletotrichum destructivum . Carl Linnaeus Carl Linnaeus (23 May 1707 – 10 January 1778), also known after ennoblement in 1761 as Carl von Linné ,

8137-594: The tribe Cynipini , their hosts mostly being oak trees and other members of the Fagaceae (the beech tree family). These are often restricted taxonomically to a single host species or a group of related species. Some wasps from other groups, such as the Diplolepididae and the Chalcidoidea , also cause plant galls. Among the hemipteran bugs that cause galls are the psyllid bug Pachypsylla celtidisumbilicus , and

8240-744: The twinflower that would become his favourite. He sometimes dismounted on the way to examine a flower or rock and was particularly interested in mosses and lichens , the latter a main part of the diet of the reindeer , a common and economically important animal in Lapland. Linnaeus travelled clockwise around the coast of the Gulf of Bothnia , making major inland incursions from Umeå , Luleå and Tornio . He returned from his six-month-long, over 2,000 kilometres (1,200 mi) expedition in October, having gathered and observed many plants, birds and rocks. Although Lapland

8343-636: The two men remained in correspondence for many years afterwards. Linnaeus dedicated his Critica Botanica to him, as " opus botanicum quo absolutius mundus non-vidit ". Linnaeus would later name a genus of tropical tree Dillenia in his honour. He then returned to Hartekamp, bringing with him many specimens of rare plants. The next year, 1737, he published Genera Plantarum , in which he described 935 genera of plants, and shortly thereafter he supplemented it with Corollarium Generum Plantarum , with another sixty ( sexaginta ) genera. His work at Hartekamp led to another book, Hortus Cliffortianus ,

8446-469: The two professors who taught at the medical faculty at Uppsala: Olof Rudbeck the Younger and Lars Roberg . Although Rudbeck and Roberg had undoubtedly been good professors, by then they were older and not so interested in teaching. Rudbeck no longer gave public lectures, and had others stand in for him. The botany, zoology, pharmacology and anatomy lectures were not in their best state. In Uppsala, Linnaeus met

8549-455: The use of his library, which included many books about botany. He also gave the student free admission to his lectures. In his spare time, Linnaeus explored the flora of Skåne, together with students sharing the same interests. In August 1728, Linnaeus decided to attend Uppsala University on the advice of Rothman, who believed it would be a better choice if Linnaeus wanted to study both medicine and botany. Rothman based this recommendation on

8652-687: The usual sites of galls, though insect galls can be found on other parts of the plant, such as the leaves, stalks , branches , buds , roots , and even flowers and fruits . Gall-inducing insects are usually species-specific and sometimes tissue-specific on the plants they gall. Gall-inducing insects include gall wasps , gall midges , gall flies , leaf-miner flies , aphids , scale insects , psyllids , thrips , gall moths, and weevils . Many gall insects remain to be described. Estimates range up to more than 210,000 species, not counting parasitoids of gall-forming insects. More than 1400 species of cynipid wasps cause galls. Some 1000 of these are in

8755-539: The way to Scania, he made his last visit to his brothers and sisters in Stenbrohult since his father had died the previous year. The expedition was similar to the previous journeys in most aspects, but this time he was also ordered to find the best place to grow walnut and Swedish whitebeam trees; these trees were used by the military to make rifles. While there, they also visited the Ramlösa mineral spa , where he remarked on

8858-471: The way, the pair stopped in Hamburg , where they met the mayor, who proudly showed them a supposed wonder of nature in his possession: the taxidermied remains of a seven-headed hydra . Linnaeus quickly discovered the specimen was a fake , cobbled together from the jaws and paws of weasels and the skins of snakes. The provenance of the hydra suggested to Linnaeus that it had been manufactured by monks to represent

8961-426: The wide range of hosts, its ability of its seeds to lie dormant for long periods and the damage caused to the host plants, C.epithymum is of major economic concern in agriculture, both within its native range and in many places where it has been introduced. In some cases infestation can lead to total loss of the crop. In Romania, all leguminous fodder crops are attacked by this dodder. It is also known to be involved in

9064-455: The winter, from which new shoots can grow the following spring. This dodder species is widely used in traditional medicine to treat a large variety of ailments. It has been used as a purgative and to treat insanity, depression, leprosy, diabetes, jaundice, liver disorders, spleen disorders, urinary tract disorders, vision problems, syphilis and rheumatism. There are indications of hepatotoxicity when used in high doses over long periods. Due to

9167-477: The world to collect botanical samples. Linnaeus called the best of these students his "apostles". His lectures were normally very popular and were often held in the Botanical Garden. He tried to teach the students to think for themselves and not trust anybody, not even him. Even more popular than the lectures were the botanical excursions made every Saturday during summer, where Linnaeus and his students explored

9270-528: The æ ligature, both in handwritten documents and in publications. Carl's patronymic would have been Nilsson, as in Carl Nilsson Linnæus. Linnaeus's father began teaching him basic Latin, religion, and geography at an early age. When Linnaeus was seven, Nils decided to hire a tutor for him. The parents picked Johan Telander, a son of a local yeoman . Linnaeus did not like him, writing in his autobiography that Telander "was better calculated to extinguish

9373-433: Was zoological . Anders Celsius had created the temperature scale named after him in 1742. Celsius's scale was originally inverted compared to the way it is used today, with water boiling at 0 °C and freezing at 100 °C. Linnaeus was the one who inverted the scale to its present usage, in 1745. In the summer of 1746, Linnaeus was once again commissioned by the Government to carry out an expedition, this time to

9476-730: Was a Swedish biologist and physician who formalised binomial nomenclature , the modern system of naming organisms. He is known as the "father of modern taxonomy ". Many of his writings were in Latin; his name is rendered in Latin as Carolus Linnæus and, after his 1761 ennoblement , as Carolus a Linné . Linnaeus was the son of a curate and was born in Råshult , in the countryside of Småland , southern Sweden . He received most of his higher education at Uppsala University and began giving lectures in botany there in 1730. He lived abroad between 1735 and 1738, where he studied and also published

9579-413: Was a region with limited biodiversity , Linnaeus described about 100 previously unidentified plants. These became the basis of his book Flora Lapponica . However, on the expedition to Lapland, Linnaeus used Latin names to describe organisms because he had not yet developed the binomial system. In Flora Lapponica Linnaeus's ideas about nomenclature and classification were first used in

9682-629: Was a serious subject. He taught Linnaeus to classify plants according to Tournefort's system. Linnaeus was also taught about the sexual reproduction of plants, according to Sébastien Vaillant . In 1727, Linnaeus, age 21, enrolled in Lund University in Skåne . He was registered as Carolus Linnæus , the Latin form of his full name, which he also used later for his Latin publications. Professor Kilian Stobæus , natural scientist, physician and historian, offered Linnaeus tutoring and lodging, as well as

9785-441: Was appointed Professor of Medicine at Uppsala University, first with responsibility for medicine-related matters. Soon, he changed place with the other Professor of Medicine, Nils Rosén, and thus was responsible for the Botanical Garden (which he would thoroughly reconstruct and expand), botany and natural history , instead. In October that same year, his wife and nine-month-old son followed him to live in Uppsala. Ten days after he

9888-482: Was appointed professor, he undertook an expedition to the island provinces of Öland and Gotland with six students from the university to look for plants useful in medicine. They stayed on Öland until 21 June, then sailed to Visby in Gotland. Linnaeus and the students stayed on Gotland for about a month, and then returned to Uppsala. During this expedition, they found 100 previously unrecorded plants. The observations from

9991-448: Was during this expedition that Linnaeus had a flash of insight regarding the classification of mammals. Upon observing the lower jawbone of a horse at the side of a road he was travelling, Linnaeus remarked: "If I only knew how many teeth and of what kind every animal had, how many teats and where they were placed, I should perhaps be able to work out a perfectly natural system for the arrangement of all quadrupeds." In 1734, Linnaeus led

10094-612: Was here that he wrote a book Hortus Cliffortianus , in the preface of which he described his experience as "the happiest time of my life". (A portion of Hartekamp was declared as public garden in April 1956 by the Heemstede local authority, and was named "Linnaeushof". It eventually became, as it is claimed, the biggest playground in Europe. ) In July 1736, Linnaeus travelled to England, at Clifford's expense. He went to London to visit Sir Hans Sloane,

10197-547: Was named Ingemarsson after his father Ingemar Bengtsson. When Nils was admitted to the University of Lund , he had to take on a family name. He adopted the Latinate name Linnæus after a giant linden tree (or lime tree), lind in Swedish, that grew on the family homestead. This name was spelled with the æ ligature . When Carl was born, he was named Carl Linnæus, with his father's family name. The son also always spelled it with

10300-420: Was one of the most acclaimed scientists in Europe. Philosopher Jean-Jacques Rousseau sent him the message: "Tell him I know no greater man on Earth." Johann Wolfgang von Goethe wrote: "With the exception of Shakespeare and Spinoza , I know no one among the no longer living who has influenced me more strongly." Swedish author August Strindberg wrote: "Linnaeus was in reality a poet who happened to become

10403-538: Was permitted to visit the mines. In April 1735, at the suggestion of Sohlberg's father, Linnaeus and Sohlberg set out for the Dutch Republic , where Linnaeus intended to study medicine at the University of Harderwijk while tutoring Sohlberg in exchange for an annual salary. At the time, it was common for Swedes to pursue doctoral degrees in the Netherlands , then a highly revered place to study natural history. On

10506-738: Was to divide the plants by the number of stamens and pistils . He began writing several books, which would later result in, for example, Genera Plantarum and Critica Botanica . He also produced a book on the plants grown in the Uppsala Botanical Garden , Adonis Uplandicus . Rudbeck's former assistant, Nils Rosén , returned to the University in March 1731 with a degree in medicine. Rosén started giving anatomy lectures and tried to take over Linnaeus's botany lectures, but Rudbeck prevented that. Until December, Rosén gave Linnaeus private tutoring in medicine. In December, Linnaeus had

10609-414: Was upset, he was given a flower, which immediately calmed him. Nils spent much time in his garden and often showed flowers to Linnaeus and told him their names. Soon Linnaeus was given his own patch of earth where he could grow plants. Carl's father was the first in his ancestry to adopt a permanent surname. Before that, ancestors had used the patronymic naming system of Scandinavian countries: his father

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