Journal of Heredity Advance Access published online on September 19, 2006
Journal of Heredity, doi:10.1093/jhered/esl029
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1 From the Department of Horticulture, Michigan State University, East Lansing, MI 48824
* To whom correspondence should be addressed. Gametophytic self-incompatibility (GSI) is an outcrossing mechanism in flowering plants that is genetically controlled by 2 separate genes located at the highly polymorphic S-locus, termed S-haplotype. This study characterizes a pollen part mutant of the S1-haplotype present in sour cherry (Rosaceae, Prunus cerasus L.) that contributes to the loss of GSI. Inheritance of S-haplotypes from reciprocal interspecific crosses between the self-compatible sour cherry cultivar Újfehértói Fürtös carrying the mutated S1-haplotype (S1'S4SdSnull) and the self-incompatible sweet cherry (Prunus avium L.) cultivars carrying the wild-type S1-haplotype revealed that the mutated S1-haplotype confers unilateral incompatibility with a functional pistil component and a nonfunctional pollen component. The altered sour cherry S1-haplotype pollen part mutant, termed S1', contains a 615-bp Ds-like element within the S1-haplotype-specific F-box protein gene (SFB1'). This insertion generates a premature in-frame stop codon that would result in a putative truncated SFB1 containing only 75 of the 375 amino acids present in the wild-type SFB1. S1' along with 2 other previously characterized Prunus S-haplotype mutants, Sf and S6m, illustrate that mobile element insertion is an evolutionary force contributing to the breakdown of GSI.
Received January 16, 2006
Accepted July 16, 2006
Article
The Mutated S1-Haplotype in Sour Cherry Has an Altered S-Haplotype-Specific F-Box Protein Gene
Nathanael R. Hauck 1, Kazuo Ikeda 2, Ryutaro Tao 2, and Amy F. Iezzoni 1 *
2 From the Laboratory of Pomology, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan
Amy F. Iezzoni, E-mail: iezzoni{at}msu.edu
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