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The role of homoploid hybridization in evolution: A century of studies synthesizing genetics and ecology.
MedLine Citation:
PMID:  25156978     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
While homoploid hybridization was viewed as maladaptive by zoologists, the possibility that it might play a creative role in evolution was explored and debated by botanists during the evolutionary synthesis. Owing to his synthetic work on the ecological and genetic factors influencing the occurrence and effects of hybridization, G. Ledyard Stebbins' contributions to this debate were particularly influential. We revisit Stebbins' views on the frequency of hybridization, the evolution of hybrid sterility, and the evolutionary importance of transgressive segregation, introgression, and homoploid hybrid speciation in the context of contemporary evidence. Floristic surveys indicate that ∼10% of plant species hybridize, suggesting that natural hybridization is not as ubiquitous as Stebbins argued. There is stronger support for his contention that chromosomal sterility is of greater importance in plants than in animals and that selection drives the evolution of hybrid sterility. Stebbins' assertions concerning the frequent occurrence of transgressive segregation and introgressive hybridization have been confirmed by contemporary work, but few studies directly link these phenomena to adaptive evolution or speciation. Stebbins proposed a mechanism by which chromosomal rearrangements partially isolate hybrid lineages and parental species, which spurred the development of the recombinational model of homoploid speciation. While this model has been confirmed empirically, the establishment of reproductively independent hybrid lineages is typically associated with the development of both intrinsic and extrinsic reproductive barriers. We conclude by reflecting on outcomes of hybridization not considered by Stebbins and on possible future research that may extend our understanding of the evolutionary role of hybridization beyond Stebbins' legacy.
Authors:
Sarah B Yakimowski; Loren H Rieseberg
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Publication Detail:
Type:  Journal Article     Date:  2014-08-12
Journal Detail:
Title:  American journal of botany     Volume:  101     ISSN:  1537-2197     ISO Abbreviation:  Am. J. Bot.     Publication Date:  2014 Aug 
Date Detail:
Created Date:  2014-08-26     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0370467     Medline TA:  Am J Bot     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1247-58     Citation Subset:  IM    
Copyright Information:
© 2014 Botanical Society of America, Inc.
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