Patterns of evolution at the gametophytic self-incompatibility Sorbus aucuparia (Pyrinae) S pollen genes support the non-self recognition by multiple factors model.
Patterns of evolution at the gametophytic self-incompatibility Sorbus aucuparia (Pyrinae) S pollen genes support the non-self recognition by multiple factors model.
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DOI：
10.1093/jxb/ert098
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发表时间：
2013-05
影响因子：
6.9
通讯作者：
Vieira CP
中科院分区：
文献类型：
--
作者：
Aguiar B;Vieira J;Cunha AE;Fonseca NA;Reboiro-Jato D;Reboiro-Jato M;Fdez-Riverola F;Raspé O;Vieira CP
基于s - rase的配子体自交不亲和性在菊科和蔷薇科分裂前进化了一次。在桃树（蔷薇科杏仁核科）中，自交不亲和的s -花粉是一个F-box基因，具有预期的进化特征。然而，在苹果和梨（玫瑰科梨亚族）中，已经描述了仅在花粉中表达并与S-RNase基因相关的F-box基因簇（称为SFBBs）。尽管SFBB基因具有多态性，但其多样性水平低于S-RNase基因。他们被认为是假定的s -花粉基因，在一个由多种因素非自我识别的系统中。不同SFBB基因的等位基因产物亚群与非自身S-RNases相互作用，标记它们进行降解，并允许相容授粉。本研究通过对梨科Sorbus aucuparia (Pyrinae) SFBB基因的详细表征，探讨了多因素模型对非自我识别的三种预测。正如预测的那样，SFBB基因的数量很大，可以解释许多S-RNase特异性。其次，与S-RNase基因一样，SFBB基因也很古老。第三，使用密码子模型分析单倍型SFBB基因时，确定了正选择下的氨基酸，即可能参与特异性决定的氨基酸。总体而言，本研究结果支持多因素非自我认知模型。
S-RNase-based gametophytic self-incompatibility evolved once before the split of the Asteridae and Rosidae. In Prunus (tribe Amygdaloideae of Rosaceae), the self-incompatibility S-pollen is a single F-box gene that presents the expected evolutionary signatures. In Malus and Pyrus (subtribe Pyrinae of Rosaceae), however, clusters of F-box genes (called SFBBs) have been described that are expressed in pollen only and are linked to the S-RNase gene. Although polymorphic, SFBB genes present levels of diversity lower than those of the S-RNase gene. They have been suggested as putative S-pollen genes, in a system of non-self recognition by multiple factors. Subsets of allelic products of the different SFBB genes interact with non-self S-RNases, marking them for degradation, and allowing compatible pollinations. This study performed a detailed characterization of SFBB genes in Sorbus aucuparia (Pyrinae) to address three predictions of the non-self recognition by multiple factors model. As predicted, the number of SFBB genes was large to account for the many S-RNase specificities. Secondly, like the S-RNase gene, the SFBB genes were old. Thirdly, amino acids under positive selection—those that could be involved in specificity determination—were identified when intra-haplotype SFBB genes were analysed using codon models. Overall, the findings reported here support the non-self recognition by multiple factors model.
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