S-RNases and sexual incompatibility: structure, functions, and evolutionary perspectives.
S-RNases and sexual incompatibility: structure, functions, and evolutionary perspectives.
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DOI：
10.1016/s1055-7903(03)00195-7
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发表时间：
2003-12
影响因子：
4.1
通讯作者：
E. Roalson;A. McCubbin
中科院分区：
文献类型：
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作者：
E. Roalson;A. McCubbin
基于S-RNase的配子体自交不亲和性是被子植物中最广泛的自交不亲和性，在茄科、玄参科和蔷薇科均有报道。这种种内繁殖障碍是由一个称为S的单一遗传位点控制的。自花花粉的排斥已被证明是由雌蕊中高度多态性的核糖核酸酶介导的，但到目前为止，这种识别系统的花粉成分尚未被确定。在这里，我们回顾了我们目前的知识有关的结构，功能和进化的S-RNases和S-位点，他们居住。此外，我们还提出了两种新的S-RNase系统发育分析，表明（1）S-等位基因之间的序列变异性分布在整个基因中，并且不像通常认为的那样聚集;（2）有证据表明S-RNase的两个不同区域中存在重组和/或多样化选择。这些研究结果的影响进行了讨论。
S-RNase-based gametophytic self-incompatibility appears to be the most phylogenetically widespread form of self-incompatibility found in the angiosperms, having been reported in the Solanaceae, Scrophulariaceae, and Rosaceae. This intraspecific breeding barrier is controlled by a single genetic locus termed S. Rejection of self-pollen has been shown to be mediated in the pistil by a highly polymorphic series of ribonucleases, but as yet the pollen component of this recognition system has not been identified. Here we review our present knowledge concerning the structure, functions, and evolution of S-RNases and the S-loci in which they reside. In addition we present two new phylogenetic analyses of S-RNases which suggest that (1) sequence variability between S-alleles is spread across the whole gene and is not as clustered as is generally believed and (2) there is evidence of recombination and/or diversifying selection in two distinct regions of S-RNases. The implications of these findings are discussed.