自交不亲和核糖核酸酶之间的进化关系。
Evolutionary relationships among self-incompatibility RNases.
作者信息
Igic B, Kohn J R
机构信息
Section of Ecology, Behavior, and Evolution, University of California at San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA.
出版信息
Proc Natl Acad Sci U S A. 2001 Nov 6;98(23):13167-71. doi: 10.1073/pnas.231386798.
T2-type RNases are responsible for self-pollen recognition and rejection in three distantly related families of flowering plants-the Solanaceae, Scrophulariaceae, and Rosaceae. We used phylogenetic analyses of 67 T2-type RNases together with information on intron number and position to determine whether the use of RNases for self-incompatibility in these families is homologous or convergent. All methods of phylogenetic reconstruction as well as patterns of variation in intron structure find that all self-incompatibility RNases along with non-S genes from only two taxa form a monophyletic clade. Several lines of evidence suggest that the best interpretation of this pattern is homology of self-incompatibility RNases from the Scrophulariaceae, Solanaceae, and Rosaceae. Because the most recent common ancestor of these three families is the ancestor of approximately 75% of dicot families, our results indicate that RNase-based self-incompatibility was the ancestral state in the majority of dicots.
T2 型核糖核酸酶负责在三个远缘相关的开花植物科——茄科、玄参科和蔷薇科中进行自花花粉识别和排斥。我们利用 67 种 T2 型核糖核酸酶的系统发育分析以及内含子数量和位置信息，来确定这些科中核糖核酸酶用于自交不亲和性是同源的还是趋同的。系统发育重建的所有方法以及内含子结构的变异模式均表明，所有自交不亲和性核糖核酸酶以及仅来自两个分类单元的非 S 基因形成一个单系类群。多条证据表明，对这种模式的最佳解释是玄参科、茄科和蔷薇科的自交不亲和性核糖核酸酶具有同源性。由于这三个科的最近共同祖先是大约 75% 的双子叶植物科的祖先，我们的结果表明基于核糖核酸酶的自交不亲和性是大多数双子叶植物的祖先状态。
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