Alloteropsis és un gènere de plantes de la família de les poàcies, ordre de les poals, subclasse de les commelínides, classe de les liliòpsides, divisió dels magnoliofitins.
Alloteropsis és un gènere de plantes de la família de les poàcies, ordre de les poals, subclasse de les commelínides, classe de les liliòpsides, divisió dels magnoliofitins.
Alloteropsis (from the Greek allotrios ("strange") and opsis ("appearance")) is a genus of Old World plants in the grass family.[4][5][6][7][8][2][9][10]
The group is widely distributed in tropical and subtropical parts of Africa, Asia and Australia, as well as on certain islands in the Indian and Pacific Oceans.[11] The genus is unusual among plants in that it includes species with both C3 and C4 photosynthetic pathways, and ongoing research is investigating these taxa as a case study in how carbon concentrating mechanisms for photosynthesis evolve in land plants.[12]
Most of the species of Alloteropsis use variants of the C4 photosynthetic pathway, but A. semialata ssp. eckloniana uses the C3 photosynthetic pathway. Phylogenetic reconstructions of the evolutionary relationships between these species have led to two hypotheses about how photosynthetic pathways have evolved within the group. First, C4 photosynthesis evolved in three lineages within this group, leading to independently derived realisations of this pathway (the hypothesis of multiple C4 origins).[13][14] Secondly, that there was a single origin of C4 photosynthesis within the genus, and the C3 taxon, A. s. ecklonia, was subsequently derived from a C4 ancestor (the reversion hypothesis).[12][13] Since C4 photosynthesis is a complex trait, its evolution followed by a reversion to the ancestral type of C3 photosynthesis would represent an exception to Dollo's law.
The reversion hypothesis is the most parsimonious explanation of phylogenetic relationships within Alloteropsis.[12] However, direct evidence for the hypothesis, in the form of C4 genes or pseudogenes in the C3 taxon, is currently lacking.[13][15] Instead, two pieces of evidence better support the hypothesis of multiple C4 origins. First, different variants of C4 leaf anatomy are found in three different Alloteropsis lineages.[13] Secondly, key C4 enzymes (PEPC and PEPCK) were recruited multiple times to function in C4 biochemistry across independent lineages.[15]
C4 photosynthetic pathway evolution in Alloteropsis also represents an example of adaptive evolution via horizontal gene transfer in eukaryotes.[15] It is the first such example of gene transfer between plant species that are not in direct physical contact (as in a host-parasite relationship). In each case, genes adapted for an important function in C4 photosynthesis have been transferred from grass lineages that diverged from Alloteropsis more than 20 million years ago,[15] and independently evolved C4 photosynthesis. Horizontally inherited genes encode the photosynthesis enzymes PEPC and PEPCK. All other genes expressed in the mature C4 leaf of A. s. semialata were vertically inherited from a common ancestor with the C3 taxon A. s. eckloniana.[15]
Alloteropsis (from the Greek allotrios ("strange") and opsis ("appearance")) is a genus of Old World plants in the grass family.
The group is widely distributed in tropical and subtropical parts of Africa, Asia and Australia, as well as on certain islands in the Indian and Pacific Oceans. The genus is unusual among plants in that it includes species with both C3 and C4 photosynthetic pathways, and ongoing research is investigating these taxa as a case study in how carbon concentrating mechanisms for photosynthesis evolve in land plants.
Alloteropsis, es un género de plantas herbáceas perteneciente a la familia Poaceae.[1] Es originario del este de África, Madagascar, Malasia y Nueva Caledonia. Comprende 13 especies descritas y de estas, solo 5 aceptadas.[2]
El género fue descrito por Jan Svatopluk Presl y publicado en Reliquiae Haenkeanae 1(4–5): 343, pl. 47. 1830.[3]
Alloteropsis, es un género de plantas herbáceas perteneciente a la familia Poaceae. Es originario del este de África, Madagascar, Malasia y Nueva Caledonia. Comprende 13 especies descritas y de estas, solo 5 aceptadas.
Alloteropsis est un genre de plantes monocotylédones de la famille des Poaceae.
Alloteropsis est un genre de plantes monocotylédones de la famille des Poaceae.
Alloteropsis is een geslacht uit de grassenfamilie (Poaceae). De soorten van dit geslacht komen voor in Afrika, Azië en Australië.[1]
Van het geslacht zijn de volgende 14 soorten bekend [bron?]:
Alloteropsis is een geslacht uit de grassenfamilie (Poaceae). De soorten van dit geslacht komen voor in Afrika, Azië en Australië.
Alloteropsis C.Presl é um género botânico pertencente à família Poaceae[1], subfamília Panicoideae, tribo Paniceae.
Espécies de plantas encontradas na África, Ásia, Australásia, Pacífico e América do Norte.
Alloteropsis C.Presl é um género botânico pertencente à família Poaceae, subfamília Panicoideae, tribo Paniceae.
Espécies de plantas encontradas na África, Ásia, Australásia, Pacífico e América do Norte.
Alloteropsis là một chi thực vật có hoa trong họ Hòa thảo (Poaceae).[1]
Chi Alloteropsis gồm các loài:
Alloteropsis là một chi thực vật có hoa trong họ Hòa thảo (Poaceae).
Alloteropsis J.Presl (1830)
Синонимы
Alloterópsis (лат.) — род травянистых растений семейства Злаки (Poaceae), распространённых в тропиках Африки, Азии и Австралии.
Многолетние травянистые растения. Лигула бахромчатая или бахромчато-плёнчатая.
Общее соцветие состоит из неразветвлённых веточек со скученными на одной стороне колосками. Нижняя колосковая чешуя значительно меньше верхней. Нижняя цветковая чешуя с остью (может отсутствовать у самых нижних).
Фотосинтез: C3 и C4.
Хромосомное число — 2n = 18, 54.
По информации базы данных The Plant List, род включает 5 видов[2]:
Alloterópsis (лат.) — род травянистых растений семейства Злаки (Poaceae), распространённых в тропиках Африки, Азии и Австралии.
毛颖草属（学名：Alloteropsis）是禾本科下的一个属，为一年生或多年生草本植物。该属共有5种，分布于东半球温带地区。[1]
这是一篇與植物相關的小作品。你可以通过编辑或修订扩充其内容。 
