Document Detail

The STUD gene is required for male-specific cytokinesis after telophase II of meiosis in Arabidopsis thaliana.
MedLine Citation:
PMID:  9224679     Owner:  NLM     Status:  MEDLINE    
During male meiosis in wild-type Arabidopsis the pollen mother cell (PMC) undergoes two meiotic nuclear divisions in the absence of cell division. Only after telophase II is a wall formed which partitions the PMC into four microspores. Each microspore undergoes two subsequent mitotic divisions to produce one vegetative cell and two sperm cells in the mature pollen grain. In this paper we describe the isolation and the phenotypic characterization of mutations in the STUD (STD) gene, which is specifically required for male-specific cytokinesis after telophase II of meiosis. Although the male meiotic nuclear divisions are normal in std mutant plants, no walls are formed resulting in a tetranucleate microspore. Despite the absence of cell division in the PMC, postmeiotic development in the coenocytic microspore proceeds relatively normally, resulting in the formation of large pollen grains which contain four vegetative nuclei and up to eight sperm cells. Interestingly, these enlarged pollen grains which contain multiple vegetative nuclei and extra sperm cells behave as single male gametophytes, producing only single pollen tubes and resulting in partial male fertility in std mutant plants. Characterization of the process of pollen development and pollen function in std mutants thus reveals two different types of developmental regulation. Each of the four nuclei found in a std microspore following meiosis is capable of independently undergoing the complete mitotic cell division (including cytokinesis) which the single nucleus of a wild-type microspore would normally undertake. The ability of the four meiotic products to independently continue through mitosis does not depend on their division into separate cells, but is controlled by some subcellular component found within the coenocytic microspore. By contrast, the mature std pollen grain functions as a unit and produces only a single pollen tube despite the presence of multiple nuclei within the vegetative cell, suggesting that this process is controlled at the cellular level independently of the extra subcellular components.
M Hulskamp; N S Parekh; P Grini; K Schneitz; I Zimmermann; S J Lolle; R E Pruitt
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Developmental biology     Volume:  187     ISSN:  0012-1606     ISO Abbreviation:  Dev. Biol.     Publication Date:  1997 Jul 
Date Detail:
Created Date:  1997-08-07     Completed Date:  1997-08-07     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0372762     Medline TA:  Dev Biol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  114-24     Citation Subset:  IM    
Lehrstuhl für Entwicklungsgenetik, Tübingen, Germany.
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MeSH Terms
Arabidopsis / cytology,  genetics,  growth & development*
Cell Cycle* / drug effects,  radiation effects
Cell Division / genetics
Cell Nucleus / physiology,  ultrastructure
Ethyl Methanesulfonate
Gamma Rays
Genes, Plant*
Meiosis / genetics
Microscopy, Electron, Scanning
Pollen / ultrastructure
Seeds / physiology,  ultrastructure
Telophase / genetics
Reg. No./Substance:
62-50-0/Ethyl Methanesulfonate

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