Document Detail

Segregation analyses of partial self-incompatibility in self and cross progeny of Solanum carolinense reveal a leaky S-allele.
MedLine Citation:
PMID:  17660567     Owner:  NLM     Status:  MEDLINE    
Natural populations of self-incompatible species often exhibit marked phenotypic variation among individuals in the strength of self-incompatibility (SI). In previous studies, we found that the strength of the SI response in Solanum carolinense, a weedy invasive with RNase-mediated SI, is a plastic trait. Selfing can be particularly important for weeds and other successional species that typically undergo repeated colonization and local extinction events and whose population sizes are often small. We applied a PCR-based protocol to identify the S-alleles present in 16 maternal genotypes and their offspring and performed a two-generation greenhouse study to determine whether variation in the strength of SI is due to the existence of weak and strong S-alleles differing in their ability to recognize and reject self-pollen. We found that allele S9 sets significantly more self seed than the other S-alleles in the population we sampled and that its ability to self is not dependent on interactions with other S-alleles. Our data suggest that the observed variations in self-fertility are likely due to factors that directly influence the expression of SI by altering the translation, turnover, or activity of the S-RNase. The variability in the strength of SI among individuals that we have observed in this and our previous studies raises the possibility that plasticity in the strength of SI in S. carolinense may play a role in the colonization and establishment of this weedy species.
Jorge I Mena-Ali; Andrew G Stephenson
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2007-07-29
Journal Detail:
Title:  Genetics     Volume:  177     ISSN:  0016-6731     ISO Abbreviation:  Genetics     Publication Date:  2007 Sep 
Date Detail:
Created Date:  2007-09-24     Completed Date:  2007-12-18     Revised Date:  2013-06-06    
Medline Journal Info:
Nlm Unique ID:  0374636     Medline TA:  Genetics     Country:  United States    
Other Details:
Languages:  eng     Pagination:  501-10     Citation Subset:  IM    
Department of Biology, Pennsylvania State University, University Park, Pennsylvania 16802, USA.
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MeSH Terms
Chromosome Segregation*
Evolution, Molecular
Gene Frequency
Linkage Disequilibrium
Models, Genetic*
Polymerase Chain Reaction
Solanum / genetics*

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