Linked Life Data

16915517

Source:http://linkedlifedata.com/resource/pubmed/id/16915517

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pubmed-article:16915517pubmed:dateCreated2006-9-26lld:pubmed
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pubmed-article:16915517pubmed:abstractTextTetraploid sour cherry (Prunus cerasus) exhibits a genotype-dependent loss of gametophytic self-incompatibility that is caused by the accumulation of non-functional S-haplotypes with disrupted pistil component (stylar-S) and/or pollen component (pollen-S) function. Genetic studies using diverse sour cherry germplasm identified non-functional S-haplotypes for which an equivalent wild-type S-haplotype was present in sweet cherry (Prunus avium), a diploid progenitor of sour cherry. In all cases, the non-functional S-haplotype resulted from mutations affecting the stylar component S-RNase or Prunus pollen component S-haplotype-specific F-box protein (SFB). This study determines the molecular bases of three of these S-haplotypes that confer unilateral incompatibility, two stylar-part mutants (S(6m2) and S(13m)) and one pollen-part mutant (S(13)'). Compared to their wild-type alleles, S(6m2)-RNase has a 1 bp deletion, S(13m) -RNase has a 23 bp deletion and SFB(13)' has a 1 bp substitution that lead to premature stop codons. Transcripts were identified for these three alleles, S(6m2)-RNase, S(13m)-RNase, and SFB(13)', however, these transcripts presumably result in altered proteins with a resulting loss of activity. Our characterization of natural pollen-part and stylar-part mutants in sour cherry along with other natural S-haplotype mutants identified in Prunus supports the view that loss of pollen specificity and stylar rejection evolve independently and are caused by structural alterations affecting the S-haplotype. The prevalence of non-functional S-haplotypes in sour cherry but not in sweet cherry (a diploid) suggests that polyploidization and gene duplication were indirectly responsible for the dysfunction of some S-haplotypes and the emergence of self-compatibility in sour cherry. This resembles the specific mode of evolution in yeast where accelerated evolution occurred to one member of the duplicated gene pair.lld:pubmed
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pubmed-article:16915517pubmed:pagination371-83lld:pubmed
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pubmed-article:16915517pubmed:year2006lld:pubmed
pubmed-article:16915517pubmed:articleTitleMolecular characterization of three non-functional S-haplotypes in sour cherry (Prunus cerasus).lld:pubmed
pubmed-article:16915517pubmed:affiliationDepartment of Horticulture, Michigan State University, East Lansing, 48824, USA.lld:pubmed
pubmed-article:16915517pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:16915517pubmed:publicationTypeResearch Support, U.S. Gov't, Non-P.H.S.lld:pubmed
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