Recognition specificity of self-incompatibility in Pyrus and Malus

文献类型： 外文期刊

第一作者： Heng, Wei

作者： Heng, Wei;Wu, Jun;Wu, Huaqing;Zhang, Shao-Ling;Nishio, Takeshi;Cao, Yufen

作者机构：

关键词： Pyrus;Malus;Self-incompatibility (SI);S-RNase;Recognition specificity;Trans-specific evolution

期刊名称：MOLECULAR BREEDING （ 影响因子：2.589； 五年影响因子：2.75 ）

ISSN： 1380-3743

年卷期： 2011 年 28 卷 4 期

页码：

收录情况： SCI

摘要： Pyrus displays gametophytic self-incompatibility controlled by a single highly polymorphic gene complex termed S locus, which comprises a stylar-expressed gene (S-RNase) tighlty linked with a pollen expressed gene, that determines the specificity of the self-incompatibility locus. Deduced amino acid sequence of 'Meigetsu' S (8) -RNase in Pyrus pyrifolia and 'Kuerlexiangli' S (28) -RNase in P. sinkiangensis showed 100% identity. S (3) -RNase in Malus spectabilis was also found to be similar to S (8) -RNase in P. pyrifolia with 96.9% identity in the deduced amino acid sequence. The intron, which is generally highly polymorphic between alleles, was also remarkably well conserved within these allele pairs. The intron of PpS (8) -RNase showed 95.3 and 91.9% identity with PsS (28) -RNase and MsS (3) -RNase, respectively. Pollen tube growth in styles, pollen tube length in artificial media containing different S-RNases and segregation of S haplotypes in F(1) plants revealed commonality of the recognition specificity between PpS (8) -RNase and PsS (28) -RNase and between PpS (8) -RNase and MsS (3) -RNase. Results suggested that PpS (8) -RNase, PsS (28) -RNase and MsS (3) -RNase have maintained the same recognition specificity after the divergence of the two species and that amino acid substitutions found between PpS (8) -RNase and MsS (3) -RNase do not alter the recognition specificity.

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