Embryology of Petrosavia(Petrosaviaceae): evidence for the distinctness of the family from other monocot
Embryology of Petrosavia(Petrosaviaceae): evidence for the distinctness of the family from other monocot
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Petrosavia（Petrosaviaceae）的胚胎学：该科与其他单子叶植物的区别的证据
DOI：
10.1007/s10265-009-0259-z
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
H.
中科院分区：
文献类型：
--
作者：
Tobe;H. and Takahashi;H.
The affinities ofPetrosavia, a rare, leafless, mycoheterotrophic genus composed of two species indigenous to East to Southeast Asia, have long been uncertain. However, recent molecular analyses show that the genus is sister toJaponolirion osense.JaponolirionandPetrosaviacomprise the Petrosaviaceae, which are now placed in its own order, Petrosaviales, distinct from other monocots based on molecular analyses. We conducted an embryological study ofPetrosavia, comparing it toJaponolirion, as well as to basal monocots (Acorusand Araceae) and more derived monocots (Nartheciaceae, Velloziaceae, and Triuridaceae). Our results showed thatPetrosaviais very similar in embryology toJaponolirion, with both genera sharing a glandular anther tapetum, simultaneous cytokinesis in microspore mother cells, anatropous and crassinucellate ovules, T-shaped tetrads of megaspores, ab initio Cellular-type endosperm, and a mature seed coat composed of the exotesta, endotesta, and endotegmen. The two genera of Petrosaviaceae are clearly distinct fromAcorus, and all Araceae, Nartheciaceae, Velloziaceae, and Triuridaceae genera in various combinations of characters. Thus, both molecular and embryological evidence support the distinctness of the Petrosaviaceae from other monocots and its placement in its own order, Petrosaviales.
