Document Detail


Angiosperm ovules: diversity, development, evolution.
MedLine Citation:
PMID:  21606056     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND: Ovules as developmental precursors of seeds are organs of central importance in angiosperm flowers and can be traced back in evolution to the earliest seed plants. Angiosperm ovules are diverse in their position in the ovary, nucellus thickness, number and thickness of integuments, degree and direction of curvature, and histological differentiations. There is a large body of literature on this diversity, and various views on its evolution have been proposed over the course of time. Most recently evo-devo studies have been concentrated on molecular developmental genetics in ovules of model plants.
SCOPE: The present review provides a synthetic treatment of several aspects of the sporophytic part of ovule diversity, development and evolution, based on extensive research on the vast original literature and on experience from my own comparative studies in a broad range of angiosperm clades.
CONCLUSIONS: In angiosperms the presence of an outer integument appears to be instrumental for ovule curvature, as indicated from studies on ovule diversity through the major clades of angiosperms, molecular developmental genetics in model species, abnormal ovules in a broad range of angiosperms, and comparison with gymnosperms with curved ovules. Lobation of integuments is not an atavism indicating evolution from telomes, but simply a morphogenetic constraint from the necessity of closure of the micropyle. Ovule shape is partly dependent on locule architecture, which is especially indicated by the occurrence of orthotropous ovules. Some ovule features are even more conservative than earlier assumed and thus of special interest in angiosperm macrosystematics.
Authors:
Peter K Endress
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Publication Detail:
Type:  Journal Article; Review     Date:  2011-05-23
Journal Detail:
Title:  Annals of botany     Volume:  107     ISSN:  1095-8290     ISO Abbreviation:  Ann. Bot.     Publication Date:  2011 Jun 
Date Detail:
Created Date:  2011-06-07     Completed Date:  2012-10-16     Revised Date:  2013-06-28    
Medline Journal Info:
Nlm Unique ID:  0372347     Medline TA:  Ann Bot     Country:  England    
Other Details:
Languages:  eng     Pagination:  1465-89     Citation Subset:  IM    
Affiliation:
Institute of Systematic Botany, University of Zurich, Zollikerstrasse 107, 8008 Zurich, Switzerland. pendress@systbot.uzh.ch
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MeSH Terms
Descriptor/Qualifier:
Angiosperms / genetics,  growth & development*,  ultrastructure
Arabidopsis / genetics,  growth & development,  ultrastructure
Biological Evolution*
Genetic Variation
Morphogenesis / genetics
Ovule / genetics,  growth & development*,  ultrastructure
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