NDLI: Pre-zygotic embryological characters ofPlatycrater arguta, a rare and endangered species endemic to East Asia

Content Provider	Springer Nature Link
Author	Ao, Cheng Qi
Copyright Year	2008
Abstract	Platycrater arguta Sieb. et Zucc. is a rare and endangered species endemic to East Asia. It produces two floral morphs viz. bisexual and male flowers. For bisexual flowers, simultaneous cytokinesis in the microsporocyte meiosis leads to a tetrahedral tetrad. The mature pollen grain is shed at 2-cell stage. The young anther wall is composed of epidermis, endothecium that develops fibrous thickenings at maturity, 1–2 middle layers and tapetum. The tapetum with uninucleate to binucleate cells, disintegrates in situ (glandular tapetum), yet in a small percentage of the anthers (about 37.6%), the tapetum does not disintegrate, causing complete male sterility. The ovules are anatropous, unitegmic, tenuinucellar and the formation of the embryo sac follows the monosporic, Polygonum type. Antipodal cells are lacking in the mature embryo sacs. Before fertilization, two polar nuclei fuse into a secondary nucleus. The formation of microsporangial wall, microsporogenesis and male gametogenesis in male flowers are analogous to those in the bisexual. Prezygotic embryological characters ofP. arguta were reported for the first time, revealing that its endangerment is correlated with the abortion of pollen of a part but not to the female development that is normal.
Starting Page	116
Ending Page	121
Page Count	6
File Format	PDF
ISSN	12269239
Journal	Journal of Plant Biology
Volume Number	51
Issue Number	2
e-ISSN	18670725
Language	English
Publisher	Springer-Verlag
Publisher Date	2008-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	anther wall endangerment mechanism gametogenesis Platycrater arguta rare and endangered sporogenesis Plant Sciences Plant Breeding/Biotechnology Plant Genetics & Genomics Plant Systematics/Taxonomy/Biogeography Plant Ecology
Content Type	Text
Resource Type	Article
Subject	Plant Science

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