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首页> 外文期刊>Genetics: A Periodical Record of Investigations Bearing on Heredity and Variation >S locus F-box brothers: multiple and pollen-specific F-box genes with S haplotype-specific polymorphisms in apple and Japanese pear.
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S locus F-box brothers: multiple and pollen-specific F-box genes with S haplotype-specific polymorphisms in apple and Japanese pear.

机译:S位点F-box兄弟:苹果和日本梨中具有S单倍型特异性多态性的多个和花粉特异性F-box基因。

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摘要

Although recent findings suggest that the F-box genes SFB/SLF control pollen-part S specificity in the S-RNase-based gametophytic self-incompatibility (GSI) system, how these genes operate in the system is unknown, and functional variation of pollen S genes in different species has been reported. Here, we analyzed the S locus of two species of Maloideae: apple (Malus domestica) and Japanese pear (Pyrus pyrifolia). The sequencing of a 317-kb region of the apple S9 haplotype revealed two similar F-box genes. Homologous sequences were isolated from different haplotypes of apple and Japanese pear, and they were found to be polymorphic genes derived from the S locus. Since each S haplotype contains two or three related genes, the genes were named SFBB for S locus F-box brothers. The SFBB genes are specifically expressed in pollen, and variable regions of the SFBB genes are under positive selection. In a style-specific mutant S haplotype of Japanese pear, the SFBB genes are retained. Apart from their multiplicity, SFBB genes meet the expected characteristics of pollen S. The unique multiplicity of SFBB genes as the pollen S candidate is discussed in the context of mechanistic variation in the S-RNase-based GSI system.
机译:尽管最近的发现表明F-box基因SFB / SLF在基于S-RNase的配子体自交不亲和性(GSI)系统中控制花粉部分S的特异性,但这些基因如何在系统中运作尚不清楚,并且花粉的功能变异已经报道了不同物种中的S基因。在这里,我们分析了两种Maloideae的S基因座:苹果(Malus domestica)和日本梨(Pyrus pyrifolia)。苹果S9单倍型的317kb区域的测序揭示了两个相似的F-box基因。从苹果和日本梨的不同单倍型中分离出同源序列,发现它们是来源于S基因座的多态性基因。由于每个S单倍型都包含两个或三个相关基因,因此该基因被命名为SFBB F-box兄弟基因。 SFBB基因在花粉中特异性表达,并且SFBB基因的可变区处于正选择状态。在日本梨的一种风格特定的突变体S单倍型中,保留了SFBB基因。除了其多样性之外,SFBB基因还满足花粉S的预期特征。在基于S-RNase的GSI系统中的机械变异的背景下,讨论了作为花粉S候选物的SFBB基因的独特多样性。

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