Document Detail

Ploidy frequencies in plants with ploidy heterogeneity: fitting a general gametic model to empirical population data.
MedLine Citation:
PMID:  23193129     Owner:  NLM     Status:  MEDLINE    
Genome duplication (polyploidy) is a recurrent evolutionary process in plants, often conferring instant reproductive isolation and thus potentially leading to speciation. Outcome of the process is often seen in the field as different cytotypes co-occur in many plant populations. Failure of meiotic reduction during gametogenesis is widely acknowledged to be the main mode of polyploid formation. To get insight into its role in the dynamics of polyploidy generation under natural conditions, and coexistence of several ploidy levels, we developed a general gametic model for diploid-polyploid systems. This model predicts equilibrium ploidy frequencies as functions of several parameters, namely the unreduced gamete proportions and fertilities of higher ploidy plants. We used data on field ploidy frequencies for 39 presumably autopolyploid plant species/populations to infer numerical values of the model parameters (either analytically or using an optimization procedure). With the exception of a few species, the model fit was very high. The estimated proportions of unreduced gametes (median of 0.0089) matched published estimates well. Our results imply that conditions for cytotype coexistence in natural populations are likely to be less restrictive than previously assumed. In addition, rather simple models show sufficiently rich behaviour to explain the prevalence of polyploids among flowering plants.
Jan Suda; Tomás Herben
Related Documents :
23685119 - Are incentive programs working? landowner attitudes to ecological restoration of agric...
24419869 - A model for the determination of the variance in genetic relationship among offspring f...
24398119 - Plant domestication versus crop evolution: a conceptual framework for cereals and grain...
23508139 - Spatial distribution characteristics of polycyclic musks as a chemical marker in river ...
24995799 - The gravity of pollination: integrating at-site features into spatial analysis of conte...
23454909 - A polyphasic approach for assessing the suitability of bioremediation for the treatment...
21882039 - Histologic, immunologic and endocrine biomarkers indicate contaminant effects in fishes...
24150499 - Identification of novel phytase genes from an agricultural soil-derived metagenome.
18342329 - Is the social parasite vespa dybowskii using chemical transparency to get her eggs acce...
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Proceedings. Biological sciences / The Royal Society     Volume:  280     ISSN:  1471-2954     ISO Abbreviation:  Proc. Biol. Sci.     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2012-11-29     Completed Date:  2013-05-06     Revised Date:  2014-01-23    
Medline Journal Info:
Nlm Unique ID:  101245157     Medline TA:  Proc Biol Sci     Country:  England    
Other Details:
Languages:  eng     Pagination:  20122387     Citation Subset:  IM    
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Angiosperms / genetics*
Flow Cytometry
Gametogenesis, Plant / genetics*
Genetic Heterogeneity*
Models, Genetic*
Species Specificity

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

Previous Document:  An allometry-based approach for understanding forest structure, predicting tree-size distribution an...
Next Document:  Phenological response of sea turtles to environmental variation across a species' northern range.