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doi:10.1534/genetics.105.049395
A more recent version of this article appeared on February 1, 2006.
REGULAR RESEARCH PAPERS |
Accumulation of non-functional S-haplotypes results in the breakdown of gametophytic self-incompatibility in tetraploid Prunus
Nathanael R Hauck 1, Hisayo Yamane 2, Ryutaro Tao 2 and Amy F Iezzoni 1*
1 Michigan State University
2 Kyoto University
* To whom correspondence should be addressed. E-mail: iezzoni{at}msu.edu.
Submitted on August 10, 2005
Revised on September 29, 2005
Accepted on 29 September 2005
The transition from self-incompatibility (SI) to self-compatibility (SC) is regarded as one of the most prevalent transitions in Angiosperm evolution, having profound impacts on the genetic structure of populations. Yet, the identity and function of mutations that result in the breakdown of SI in nature are not well understood. This work provides the first detailed genetic description of the breakdown of S-RNase mediated gametophytic self-incompatibility (GSI) in a polyploid species that exhibits genotype-dependent loss of SI. Genetic analyses of six natural sour cherry (Rosaceae, Prunus cerasus) selections identified seven independent, non-functional S-haplotypes with disrupted pistil component (stylar-S) and/or pollen component (pollen-S) function. A genetic model is developed and validated demonstrating that the breakdown of SI in sour cherry is due to the accumulation of a minimum of two non-functional S-haplotypes within a single individual. Our finding that sour cherry is SI when only one non-functional S-haplotype is present has significant evolutionary implications since non-functional S-haplotypes would be maintained in the population without causing an abrupt shift to SC. Furthermore, we demonstrate that heteroallelic sour cherry pollen is self-incompatible, which is counter to the well-documented phenomena in the Solanaceae where SC accompanying polyploidization is frequently due to the SC of heteroallelic pollen.
Key Words: Gametophytic self-incompatibility, Heteroallelic pollen, Polyploidy, S-RNase, S-locus
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