Arceuthobium est un genre de plantes dicotylédones.

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  • Arceuthobium est un genre de plantes dicotylédones.
  • Die Zwergmisteln (Arceuthobium) sind eine Pflanzengattung aus der Familie der Sandelholzgewächse (Santalaceae). Es sind parasitische Pflanzen, die auf Kieferngewächsen (Pinaceae) und Zypressengewächsen (Cupressaceae) wachsen.
  • Арцеуто́биум (лат. Arceuthóbium) — род полупаразитических кустарников и трав семейства Санталовые, распространённых в Евразии, Африке, Северной и Южной Америке. Ранее этот род помещали в семейство Омеловые или семейство Ремнецветниковые.Синоним научного названия — Razoumofskya Hoffm.
  • Arceuthobium es un género de 42 especies de plantas parásitas que parasíta miembros de la familia Pinaceae y Cupressaceae en Norteamérica, Centroamérica, Asia y África. De las 42 especies, 39 y 21 son endémicas de Norteamérica y Estados Unidos, respectivamente. Tienen unos brotes y hojas reducidas (la mayoría reducidas a escalas). Recientemente el número de especies se ha reducido a 26 como resultado de un análisis filogenético más detallado.En los bosques de Norteamérica estas especies están consideradas como una peste porque destruyen los árboles que infectan.Hay también varias especies de Europa y Asia incluyendo una de las más pequeñas del género, A. minutissimum que se hospeda en Pinus wallichiana en el Himalaya.
  • Arceuthobium é um género botânico pertencente à família Santalaceae que inclui 42 espécies de plantas parasitas que têm como hospedeiro membros das famílias Pinaceae e Cupressaceae na América do Norte, América Central, Ásia, Europa e África. Das 42 espécies correntemente aceites, 39 e 21 são endémicas da América do Norte e dos Estados Unidos da América, respectivamente. O género caracteriza-se por ter caules de cor amarelo-esverdeada, brilhante, com raras ramificações secundárias verticiladas e folhas vestigiais, em geral reduzidas a escamas. Em resultado de uma análise filogenética mais detalhada, foi recentemente proposta a redução do número de espécies para apenas 26.Nas florestas da América do Norte estas espécies são consideradas como uma praga, pois em geral destroem as árvores que infestam.Existem também várias espécies na Europa e Ásia, incluindo uma das mais diminutas do género, A. minutissimum, que parasita a espécie Pinus wallichiana na cadeia dos Himalaias.
  • The genus Arceuthobium, commonly called Dwarf Mistletoes, is a genus of 42 species of parasitic plants that parasitize members of Pinaceae and Cupressaceae in North America, Central America, Asia and Africa. Of the 42 species, 39 and 21 are endemic to North America and the United States, respectively. They all have very reduced shoots and leaves (mostly reduced to scales) with the bulk of the plant living under the host's bark. Recently the number of species within the genus has been reduced to 26 as a result of more detailed genetic analysis.In western forest ecosystems of North America, numerous dwarf mistletoe species are considered to be serious forest-borne disease agents. Severe dwarf mistletoe infection can result in a reduction in tree growth, premature tree mortality, reduced seed and cone development, reduced wood quality, and increase the susceptibility of the host tree to pathogen and/or insect attack. Most of the commercially important conifers in western North America are parasitized by one or more dwarf mistletoes.The interaction between dwarf mistletoes and their host can be generalized as a source-to-sink relationship. Dwarf mistletoes derive the majority of their nutrition from the host’s vascular tissues. Dwarf mistletoes have a root-like endophytic system, composed of primary and secondary haustoria, which invade, but do not injure, both the xylem and phloem of the host. Because this root-like endophytic system is not soil-borne, dwarf mistletoes are solely dependent on their host for water. Along a xylem-to-xylem link, dwarf mistletoes draw water from their host due to differences in water potential between dwarf mistletoes and their hosts. Dwarf mistletoes facilitate this water gradient by having greater transpiration rates, thereby producing lower water potentials and allowing water to flow from the hosts to the dwarf mistletoes. The water gradient or transpiration stream is consistently maintained, even when the host is under moderate water deficits. In addition to host-water dependence, dwarf mistletoes must acquire carbohydrate and mineral nutrition from their hosts. Dwarf mistletoes have both chlorophyll a and chlorophyll b and the necessary mechanisms for photosynthesis, but chlorophyll concentrations in dwarf mistletoes are approximately 1/5 to 1/10 of those found in their host’s foliage, and dwarf mistletoes have low photosynthetic rates as measured by the rate of carbon fixation. The principal carbohydrate transported from the host to dwarf mistletoe is sucrose. Dwarf mistletoes are phloem deficient; therefore, dwarf mistletoes draw carbohydrates from their hosts by connections to the host phloem and ray parenchyma. The rate of carbohydrate transport between dwarf mistletoes varies according to season, but dwarf mistletoes continuously draw carbohydrates from their hosts throughout the year.They are dioecious, individual plants being either male or female. The fruit is unusual in that it builds up hydrostatic pressure internally when ripe and shoots the single sticky seed up to speeds nearly 50 miles per hour (80 km/h), an example of rapid plant movement. The seeds are enveloped in a hygroscopic, glue-like substance called viscin. Many fail to land on a suitable host's shoot, but some succeed, and in this way they are spread through the forests as a pest front. The spread of dwarf mistletoes in forest stands is greatest from the overstory to the understory, due to gravity. Advantageous stand conditions for the spread of dwarf mistletoes include an uneven-aged stand structure with severely infected-hosts in dominant and codominant crown classes, species composition dominated by the primary host, and tree densities that are between 175 - 500 trees/ha.There are also a number of species from Europe and Asia including one of the smallest in the genus, A. minutissimum that lives on its host, Pinus wallichiana in the Himalaya.
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  • Category:Arceuthobium
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  • Arceuthobium
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  • Arceuthobium est un genre de plantes dicotylédones.
  • Die Zwergmisteln (Arceuthobium) sind eine Pflanzengattung aus der Familie der Sandelholzgewächse (Santalaceae). Es sind parasitische Pflanzen, die auf Kieferngewächsen (Pinaceae) und Zypressengewächsen (Cupressaceae) wachsen.
  • Арцеуто́биум (лат. Arceuthóbium) — род полупаразитических кустарников и трав семейства Санталовые, распространённых в Евразии, Африке, Северной и Южной Америке. Ранее этот род помещали в семейство Омеловые или семейство Ремнецветниковые.Синоним научного названия — Razoumofskya Hoffm.
  • Arceuthobium es un género de 42 especies de plantas parásitas que parasíta miembros de la familia Pinaceae y Cupressaceae en Norteamérica, Centroamérica, Asia y África. De las 42 especies, 39 y 21 son endémicas de Norteamérica y Estados Unidos, respectivamente. Tienen unos brotes y hojas reducidas (la mayoría reducidas a escalas).
  • The genus Arceuthobium, commonly called Dwarf Mistletoes, is a genus of 42 species of parasitic plants that parasitize members of Pinaceae and Cupressaceae in North America, Central America, Asia and Africa. Of the 42 species, 39 and 21 are endemic to North America and the United States, respectively. They all have very reduced shoots and leaves (mostly reduced to scales) with the bulk of the plant living under the host's bark.
  • Arceuthobium é um género botânico pertencente à família Santalaceae que inclui 42 espécies de plantas parasitas que têm como hospedeiro membros das famílias Pinaceae e Cupressaceae na América do Norte, América Central, Ásia, Europa e África. Das 42 espécies correntemente aceites, 39 e 21 são endémicas da América do Norte e dos Estados Unidos da América, respectivamente.
rdfs:label
  • Arceuthobium
  • Arceuthobium
  • Arceuthobium
  • Arceuthobium
  • Zwergmisteln
  • Арцеутобиум
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