Inheritance of hetero-diploid pollen S-haplotype in self-compatible tetraploid Chinese cherry (Prunus pseudocerasus Lindl).
Inheritance of hetero-diploid pollen S-haplotype in self-compatible tetraploid Chinese cherry (Prunus pseudocerasus Lindl).
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自交亲和四倍体樱桃异二倍体花粉S单倍型的遗传
DOI：
10.1371/journal.pone.0061219
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发表时间：
2013
期刊：
影响因子：
3.7
通讯作者：
Zhang SL
中科院分区：
文献类型：
--
作者：
Gu C;Liu QZ;Yang YN;Zhang SJ;Khan MA;Wu J;Zhang SL
四倍体蔷薇科植物自交不亲和性的破坏可能是由于非功能性S-单倍型的积累或两种不同功能性S-单倍型之间的竞争性相互作用引起的。本研究以2个四倍体中国樱桃（Prunus pseudoceretum）和1个二倍体甜樱桃（Prunus avium）为材料，研究了花粉倍性和花粉S等位基因的遗传。对两个中国樱桃品种异交授粉后代的S基因型进行遗传分析，结果表明，中国樱桃品种花粉为异源二倍体，两个S单倍型由四种可能的S单倍型中的两种组合而成。单倍型在自交和异交后代中的分布也不平衡。在两个自交和两个异花授粉后代中，两种不同S-单倍型的个体数不等。在两个自交后代中，含有两种不同S单倍型（S1-和S5-，S5-和S8-，S1-和S4-）的个体数明显多于其它个体，表明这些异源二倍体花粉粒中的一些可能具有将S-RNase插入花粉管中的能力，并能更好地生长到子房中。
The breakdown of self-incompatibility, which could result from the accumulation of non-functional S-haplotypes or competitive interaction between two different functional S-haplotypes, has been studied extensively at the molecular level in tetraploid Rosaceae species. In this study, two tetraploid Chinese cherry (Prunus pseudocerasus) cultivars and one diploid sweet cherry (Prunus avium) cultivar were used to investigate the ploidy of pollen grains and inheritance of pollen-S alleles. Genetic analysis of the S-genotypes of two intercross-pollinated progenies showed that the pollen grains derived from Chinese cherry cultivars were hetero-diploid, and that the two S-haplotypes were made up of every combination of two of the four possible S-haplotypes. Moreover, the distributions of single S-haplotypes expressed in self- and intercross-pollinated progenies were in disequilibrium. The number of individuals of the two different S-haplotypes was unequal in two self-pollinated and two intercross-pollinated progenies. Notably, the number of individuals containing two different S-haplotypes (S1- and S5-, S5- and S8-, S1- and S4-haplotype) was larger than that of other individuals in the two self-pollinated progenies, indicating that some of these hetero-diploid pollen grains may have the capability to inactivate stylar S-RNase inside the pollen tube and grow better into the ovaries.
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