Document Detail

A population dynamic model for facultative agamosperms.
MedLine Citation:
PMID:  12051978     Owner:  NLM     Status:  MEDLINE    
Plants that can reproduce both sexually and agamically are called facultative apomicts. Some species, such as Taraxacum, contain both sexual diploids and triploid facultative apomicts. Triploids produce seeds without gamete fusion and recombination, and can also produce pollen and fertilize diploids. We present a population dynamic model that deals with gene flow and competition between diploids and triploids, with differing allocation towards reproductive investment in seeds and pollen. This paper examines whether diploids and triploids of plants with facultative agamospermy can coexist within a single population. We analyse the global behavior of such a dynamic system. Features of the system are significantly affected by the germination rates of diploids and triploids. Either diploids or triploids persist alone when the germination rate of diploids is sufficiently larger or smaller than that of triploids, respectively. Competitive exclusion occurs when both germination rates are sufficiently large. Coexistence is possible under certain specific conditions when: (I) the germination rates of both diploid sexuals and triploids are not sufficiently large, and (II) triploids produce sufficient pollen. When diploid sexuals and triploids coexist, triploids cannot exist alone, implying that the pollen of triploids is necessary to exploit diploid ovules.
Yuu Nakayama; Hiromi Seno; Hirouyki Matsuda
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of theoretical biology     Volume:  215     ISSN:  0022-5193     ISO Abbreviation:  J. Theor. Biol.     Publication Date:  2002 Mar 
Date Detail:
Created Date:  2002-06-07     Completed Date:  2002-08-06     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0376342     Medline TA:  J Theor Biol     Country:  England    
Other Details:
Languages:  eng     Pagination:  253-62     Citation Subset:  IM    
Copyright Information:
Copyright 2002 Elsevier Science Ltd. All rights reserved.
Ocean Research Institute, University of Tokyo, 1-15-1 Minamidai, Nakano-ku, Tokyo, 164-8639, Japan.
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MeSH Terms
Models, Biological
Plant Physiological Phenomena*
Population Dynamics
Reproduction, Asexual

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

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