Document Detail


Tapetal cell fate, lineage and proliferation in the Arabidopsis anther.
MedLine Citation:
PMID:  20570940     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The four microsporangia of the flowering plant anther develop from archesporial cells in the L2 of the primordium. Within each microsporangium, developing microsporocytes are surrounded by concentric monolayers of tapetal, middle layer and endothecial cells. How this intricate array of tissues, each containing relatively few cells, is established in an organ possessing no formal meristems is poorly understood. We describe here the pivotal role of the LRR receptor kinase EXCESS MICROSPOROCYTES 1 (EMS1) in forming the monolayer of tapetal nurse cells in Arabidopsis. Unusually for plants, tapetal cells are specified very early in development, and are subsequently stimulated to proliferate by a receptor-like kinase (RLK) complex that includes EMS1. Mutations in members of this EMS1 signalling complex and its putative ligand result in male-sterile plants in which tapetal initials fail to proliferate. Surprisingly, these cells continue to develop, isolated at the locular periphery. Mutant and wild-type microsporangia expand at similar rates and the 'tapetal' space at the periphery of mutant locules becomes occupied by microsporocytes. However, induction of late expression of EMS1 in the few tapetal initials in ems1 plants results in their proliferation to generate a functional tapetum, and this proliferation suppresses microsporocyte number. Our experiments also show that integrity of the tapetal monolayer is crucial for the maintenance of the polarity of divisions within it. This unexpected autonomy of the tapetal 'lineage' is discussed in the context of tissue development in complex plant organs, where constancy in size, shape and cell number is crucial.
Authors:
Xiaoqi Feng; Hugh G Dickinson
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Development (Cambridge, England)     Volume:  137     ISSN:  1477-9129     ISO Abbreviation:  Development     Publication Date:  2010 Jul 
Date Detail:
Created Date:  2010-06-23     Completed Date:  2010-07-13     Revised Date:  2014-10-14    
Medline Journal Info:
Nlm Unique ID:  8701744     Medline TA:  Development     Country:  England    
Other Details:
Languages:  eng     Pagination:  2409-16     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Arabidopsis* / genetics,  growth & development,  metabolism
Cell Differentiation / genetics
Cerebellar Cortex / metabolism
Flowers / genetics,  growth & development*,  metabolism*
Genotype
Mutation
Grant Support
ID/Acronym/Agency:
P18336//Biotechnology and Biological Sciences Research Council

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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