Pueraria montana | |
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Pueraria montana var. lobata | |
Scientific classification | |
Kingdom: | Plantae |
Clade: | Tracheophytes |
Clade: | Angiosperms |
Clade: | Eudicots |
Clade: | Rosids |
Order: | Fabales |
Family: | Fabaceae |
Subfamily: | Faboideae |
Genus: | Pueraria |
Species: | P. montana |
Binomial name | |
Pueraria montana | |
Synonyms [1] [2] | |
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Pueraria montana is a species of plant in the botanical family Fabaceae. [3] At least three sub-species (alternatively called varieties) are known. It is closely related to other species in the genus Pueraria (P. edulis and P. phaseoloides ) and the common name kudzu is used for all of these species and hybrids between them. The morphological differences between them are subtle, they can breed with each other, and it appears that introduced kudzu populations in the United States have ancestry from more than one of the species. [4] [5]
It is a seasonal climbing plant, growing high where suitable surfaces (trees, cliffs, walls) are available, and also growing as ground cover where there are no vertical surfaces. It is a perennial vine with tuberous roots and rope-like, dark brown stems to 20 m (66 ft) long. It grows up to 20 metres (66 ft) per year and can achieve a height of 30 metres (98 ft). It has markedly hairy herbaceous stems.
Pueraria montana is native to East Asia, primarily subtropical and temperate regions of China, Japan, and Korea, [6] [7] with trifoliate leaves composed of three leaflets. [8] [9] Each leaflet is large and ovate with two to three lobes each and hair on the underside. [8] [10] The species can fix atmospheric nitrogen, which can supply up to 95% of leaf nitrogen to the plant in poor soils. [8] Along the vines are nodes, points at which stems or tendrils can propagate to increase support and attach to structures. [8] As a twining vine, kudzu uses stems or tendrils that can extend from any node on the vine to attach to and climb most surfaces. [6] [8] [11] In addition, the nodes of the kudzu vine have the ability to root when exposed to soil, further anchoring the vine to the ground. [6] [8] The roots are tuberous and are high in starch and water content, and the twining of the plant allows for less carbon concentration in the construction of woody stems and greater concentration in roots, which aids root growth. [8] The roots can account for up to 40% of total plant biomass. [6]
Flowers are reddish-purple and yellow, fragrant, similar to pea flowers, about 20–25 millimetres (3⁄4–1 in) wide and are produced at the leaf axis in elongated racemes about 20 centimetres (8 in) long. The flowering period extends from July through October. The fruit is a flat hairy pod about 8 centimetres (3 in) long with three seeds.
Kudzu's primary method of reproduction is asexual vegetative spread (cloning) which is aided by the ability to root wherever a stem is exposed to soil. [8] For sexual reproduction, kudzu is entirely dependent on pollinators. [8]
Although kudzu prefers forest regrowth and edge habitats with high sun exposure, the plant can survive in full sun or partial shade. [6] [8] These attributes of kudzu made it attractive as an ornamental plant for shading porches in the Southeastern United States, but they facilitated the growth of kudzu as it became a “structural parasite” of the southern states, [8] enveloping entire structures when untreated [10] and often referred to as “the vine that ate the south”. [12]
The Latin specific epithet montana refers to mountains or coming from mountains. [14]
Kudzu has been referred to as a "quasi-wild" species, since it has been farmed and selectively bred by humans for millennia in its native range, but cultivated strains have never become isolated from wild populations, resulting in repeated interchanges between wild and farmed kudzu. As a result, the gene pool of kudzu is diverse, vigorous, and strongly influenced by the plant's relationship with humans. [15] The main uses of kudzu are for food, for fiber, and as a medicinal plant; it is also used to make paper, for basketry, and as a food source for livestock.
The starchy root of kudzu has been used for food in China since before 540 CE, with specific cultivars bred for this purpose, and often sustained Chinese people during famines that occurred throughout history. Kudzu starch is used as a thickening or gelling agent similar to arrowroot, tapioca or potato starch, and has many alleged benefits as a health food. [16] [17] Kudzu is still utilized for food in China, Japan, and Korea. Kudzu starch is an important component of many Japanese confections and sweets, valued for its ability to set firmly with a fine, translucent appearance. It is also turned into flour and can be used to make noodles. [18] [19] Kudzu is furthermore considered an important medicinal plant, and is sometimes sold as a supplement in health food stores.
Kudzu cloth is called "ko-pu" and archaeological records indicate that ko-pu was used in China at least 6,000 years ago. From the Zhou dynasty to the early twentieth century, kudzu was one of three major textile materials used in China, with the others being silk and ramie. Kudzu textiles were inexpensive and widespread, and formed such a major part of commerce that the Zhou dynasty had a specific office for dealing with kudzu-related affairs. [15] In Japan, the earliest evidence for kudzu cloth dates back to 300-538 CE, and it continued to be used into the Edo period. Kudzu fiber is a bast fiber, like linen or hemp. To obtain the bast fibers, the new young vines are harvested in summer and boiled, then left to be fermented by the action of naturally occurring bacteria in mounds of grass until the outer bark becomes slimy and can be washed off in running water. [18]
In 2023, kudzu was used to develop a biodegradable alternative to plastic food packaging. [20]
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The natural range of Pueraria montana can be found in India, Myanmar, Indochina, China, Korea, Japan, Thailand, Malaysia, the Pacific Islands, and in north Australia. [21] In its native habitat, it and its closely related species occur across wide areas; the species have diverged genetically due to vicariance. Its invasiveness can be attributed to similarities between both native and newly invaded niches, effectively expanding its habitable range into areas with climates it may not be able to endure otherwise. [22]
Some researchers argue that, because of the close relationship shared between kudzu and humans since the Neolithic, human harvesting is the main ecological control mechanism that keeps kudzu in check in its natural range. In Eastern Asia, where kudzu is a valuable plant with many benefits to humans, many millennia of human selection and cultivation have facilitated the spread of the plant to new areas and resulted in a broad, adaptable gene pool. However, although humans have provided benefits to kudzu, harvesting the vines and roots regularly would decrease the plant's competitiveness and aggressive growth, meaning humans have essentially served as a biological control for kudzu. [15]
Like other exotic species, the introduction to other areas is due to human actions. Seeds are spread by mammals and birds. Kudzu are plants adapted to drought. Only above ground portions are damaged by frost; thick storage roots grow as deep as 1 metre. It forms new perennial root crowns from stem nodes touching the ground.
The ecological requirements of the species are those of the subtropical and temperate habitat areas. [23]
In Europe, Pueraria montana grows in several places in the warm regions of Switzerland and Italy near Lake Maggiore and Lake Lugano.
During World War II, kudzu was introduced to Vanuatu and Fiji by United States Armed Forces to serve as camouflage for equipment. It is now a major weed there. [24]
Pueraria montana is also becoming a problem in Queensland.
In the United States, Pueraria montana is extensively reported in the coastal states from eastern Texas to Florida, North to Maryland, as well as inland in Arkansas, Kentucky, Missouri, Pennsylvania, Tennessee, Washington, D.C., and West Virginia. Since 2004, Kudzu has moved farther North along the Ohio River, appearing in Illinois, Indiana, and Ohio. [25] Of all affected states, three in the southeast have the heaviest infestations: Georgia, Alabama, and Mississippi.
Due to the aggressive, climbing nature of P. montana it often causes shading and death of native vegetation, resulting in a monoculture of P. montana. As P. montana spreads, it shades and crushes its competitors with its weight, eliminating everything in its path. As a result of growing over native plants and trees, it blocks their access of vital resources such as sunlight, killing off young vegetation. These result in dramatic reductions in native biodiversity at the local level. [8]
Other than the loss of biodiversity of plant species, P. montana may have a negative effect on animals. Many plant species that are suppressed by P. montana because of its uncontrolled and rapid growth negatively impacts some wildlife animals that have specific mutualisms or feeding relationships with these plant species. [8] This potentially could lead to the death of certain animal species, specifically herbivores, that depend on some vegetation as a resource for both food and shelter. These are important factors that lead to habitat destruction and reduction in animal biodiversity.
Changes in the global environment such as higher CO2 levels, higher temperatures, greater rates of nitrogen deposition, and greater fragmentation of natural habitats are predicted to increase the spread of P. montana.
Kudzu is highly responsive to increased CO2 levels as it results in maximal leaf expansion, increase in leaf size, and an overall 12% increase in leaf production. In turn, the plant has higher turgor pressure which results in the improvements in its growth potential. As the atmospheric CO2 concentration continues to rise, it is possible for the potential enhancement of P. montana’s invasiveness. [26]
With global warming, overnight temperatures tend to increase. Data collected in the United States over the past few decades showed a reduction in frost days, an earlier date for the last freeze in spring, and a later date for the first freeze in fall. [8] These favour the spread of P. montana.
The northward distribution of P. montana is hypothesized to be limited by low temperatures. Cold temperatures cause their leaves to be killed off and their leaf expansion to be lagged. However, with the continuous rise in global temperature, it is predicted that P. montana will rapidly spread northward as a result of the increased number of warmer days. [8]
Kudzu, also called Japanese arrowroot or Chinese arrowroot, is a group of climbing, coiling, and trailing deciduous perennial vines native to much of East Asia, Southeast Asia, and some Pacific islands, but invasive in many parts of the world, primarily North America.
A vine is any plant with a growth habit of trailing or scandent stems, lianas, or runners. The word vine can also refer to such stems or runners themselves, for instance, when used in wicker work.
Toxicodendron radicans, commonly known as eastern poison ivy or poison ivy, is an allergenic flowering plant that occurs in Asia and eastern North America. The species is well known for causing urushiol-induced contact dermatitis, an itchy, irritating, and sometimes painful rash, in most people who touch it. The rash is caused by urushiol, a clear liquid compound in the plant's sap. The species is variable in its appearance and habit, and despite its common name, it is not a true ivy (Hedera), but rather a member of the cashew and pistachio family (Anacardiaceae). T. radicans is commonly eaten by many animals and the seeds are consumed by birds, but poison ivy is most often thought of as an unwelcome weed. It is a different species from western poison ivy, T. rydbergii, which has similar effects.
The parsnip is a root vegetable closely related to carrot and parsley, all belonging to the flowering plant family Apiaceae. It is a biennial plant usually grown as an annual. Its long taproot has cream-colored skin and flesh, and, left in the ground to mature, becomes sweeter in flavor after winter frosts. In its first growing season, the plant has a rosette of pinnate, mid-green leaves. If unharvested, it produces a flowering stem topped by an umbel of small yellow flowers in its second growing season, later producing pale brown, flat, winged seeds. By this time, the stem has become woody, and the tap root inedible. Precautions should be taken when handling the stems and foliage, as parsnip sap can cause a skin rash or even blindness if exposed to sunlight after handling.
Pueraria is a genus of 15–20 species of legumes native to south, east, and southeast Asia and to New Guinea and northern Australia. The best known member is kudzu, also called Japanese arrowroot. The genus is named after 19th century Swiss botanist Marc Nicolas Puerari.
Imperata cylindrica is a species of perennial rhizomatous grass native to tropical and subtropical Asia, Micronesia, Melanesia, Australia, Africa, and Southern Europe. It has also been introduced to Latin America, the Caribbean, and the Southeastern United States. It is a highly flammable pyrophyte, and can spread rapidly by colonizing disturbed areas and encouraging more frequent wildfires.
Canna indica, commonly known as Indian shot, African arrowroot, edible canna, purple arrowroot, Sierra Leone arrowroot, is a plant species in the family Cannaceae. It is native to much of South America, Central America, the West Indies, and Mexico. It is also naturalized in the southeastern United States, and much of Europe, sub-Saharan Africa, Southeast Asia, and Oceania.
Daidzein is a naturally occurring compound found exclusively in soybeans and other legumes and structurally belongs to a class of compounds known as isoflavones. Daidzein and other isoflavones are produced in plants through the phenylpropanoid pathway of secondary metabolism and are used as signal carriers, and defense responses to pathogenic attacks. In humans, recent research has shown the viability of using daidzein in medicine for menopausal relief, osteoporosis, blood cholesterol, and lowering the risk of some hormone-related cancers, and heart disease. Despite the known health benefits, the use of both puerarin and daidzein is limited by their poor bioavailability and low water solubility.
A weed is a plant considered undesirable in a particular situation, growing where it conflicts with human preferences, needs, or goals. Plants with characteristics that make them hazardous, aesthetically unappealing, difficult to control in managed environments, or otherwise unwanted in farm land, orchards, gardens, lawns, parks, recreational spaces, residential and industrial areas, may all be considered weeds. The concept of weeds is particularly significant in agriculture, where the presence of weeds in fields used to grow crops may cause major losses in yields. Invasive species, plants introduced to an environment where their presence negatively impacts the overall functioning and biodiversity of the ecosystem, may also sometimes be considered weeds.
Daidzin is a natural organic compound in the class of phytochemicals known as isoflavones. Daidzin can be found in Japanese plant kudzu and from soybean leaves.
Puerarin, one of several known isoflavones, is found in a number of plants and herbs, such as the root of the kudzu plant
Echinocystis is a monotypic genus in the gourd family, Cucurbitaceae. The sole species is E. lobata, commonly called wild cucumber, prickly cucumber or bur cucumber. It is an annual, sprawling plant that is native to North America.
Diacetylverrucarol is a natural trichothecene produced by the fungus Myrothecium verrucaria. Chemically, it is an acetate derivative of verrucarol.
Bryonia alba is a vigorous vine in the family Cucurbitaceae, found in Europe and Northern Iran. It has a growth habit similar to kudzu, which gives it a highly destructive potential outside its native range as a noxious weed. Other common names include false mandrake, English mandrake, wild vine, and wild hops, wild nep, tamus, ladies' seal, and tetterbury.
Kudzu is an invasive plant species in the United States, introduced from Asia with devastating environmental consequences, earning it the nickname "the vine that ate the South". It has been spreading rapidly in the Southern United States, "easily outpacing the use of herbicide, spraying, and mowing, as well increasing the costs of these controls by $6 million annually". Estimates of the vine's spread vary, from the United States Forest Service's 2015 estimate of 2,500 acres per year to the Department of Agriculture's estimate of as much as 150,000 acres annually.
Pueraria tuberosa, commonly known as kudzu, Indian kudzu, or Nepalese kudzu, Vidarikand, Sanskrit: Bhukushmandi (भूकुशमंडी) is a climber with woody tuberculated stem. It is a climbing, coiling and trailing vine with large tuberous roots. The tubers are globose or pot-like, about 25 centimetres (9.8 in) across and the insides are white, starchy and mildly sweet. Leaves are trifoliate and alternate, while the leaflets are egg-shaped, with round base and unequal sides. They are 18 cm (7.1 in) long and 16 cm (6.3 in) wide and are hairless above. Flowers are bisexual, around 1.5 cm (0.59 in) across and blue or purplish-blue in color. The fruit pods are linear, about 2–5 cm (0.79–1.97 in) long and constricted densely between the seeds. They have silky, bristly reddish-brown hair. Seeds vary from 3 to 6 in number.
Sisyrinchium dichotomum is a rare species of flowering plant in the iris family known by the common names wishbone blue-eyed grass, white irisette, and reflexed blue-eyed grass. It is native to North Carolina and South Carolina in the United States, where fewer than ten populations remain in four counties. It is threatened by the loss and degradation of its habitat and is a federally listed endangered species of the United States.
Arrowroot is a starch obtained from the rhizomes (rootstock) of several tropical plants, traditionally Maranta arundinacea, but also Florida arrowroot from Zamia integrifolia, and tapioca from cassava, which is often labeled arrowroot. Polynesian arrowroot or pia, and Japanese arrowroot, also called kudzu, are used in similar ways. In India, it is called palua.
Neustanthus is a monotypic genus of flowering plants belonging to the pea family Fabaceae and its tribe Phaseoleae. The only species is Neustanthus phaseoloides, called tropical kudzu. This species is a forage crop and cover crop used in the tropics. It is known as puero in Australia and tropical kudzu in most tropical regions.
Pueraria montana var. lobata, the East Asian arrowroot, or kudzu vine, is a perennial plant in the family Fabaceae.