Document Detail


Sporogenesis and development of gametophytes in an endangered plant, Tetracentron sinense Oliv.
MedLine Citation:
PMID:  23558997     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
The sporogenesis and development of gametophytes in Tetracentron sinense Oliv. were studied with light microscopy. The anther has four microsporangia; its primary anther wall consists of an epidermis, an endothecium, one or two middle layers and one glandular tapetum. Simultaneous cytokinesis follows meiosis, forming a tetrahedral tetrad. Mature pollen grains are two-celled at the time of anther dehiscence. Its ovule is anatropous, bitegmic and crassinucellate; the development of the female gametophyte is of the monosporic 8-nucleate Polygonum type. Significantly, some striking features were first found in T. sinense: (1) anther dehiscence occurs soon after the endothecium fibrously thickens and the intersporangial septum degenerates; (2) tapetum degeneration is retarded, persisting up to the stage of two-celled pollen grain; (3) a few cellular events such as the vacuolization and the contraction and deformation of the pollen mother cell (PMC) and microspore are not normal at the PMC, dyad and tetrad stages. The abnormalities during male reproduction might be one of important factors resulting in the poor natural regeneration of T. sinense.
Authors:
Xiaohong Gan; Dan Xie; Lingling Cao
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Biological research     Volume:  45     ISSN:  0717-6287     ISO Abbreviation:  Biol. Res.     Publication Date:  2012  
Date Detail:
Created Date:  2013-04-05     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9308271     Medline TA:  Biol Res     Country:  Chile    
Other Details:
Languages:  eng     Pagination:  393-8     Citation Subset:  IM    
Affiliation:
College of Life Science, China West Normal University, Nanchong, China.
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