Heterostyly: speciation within a species
Heterostyly: speciation within a species
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DOI：
10.1007/s10144-004-0191-y
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发表时间：
2004-12-01
影响因子：
1.7
通讯作者：
Toquenaga, Y
中科院分区：
文献类型：
--
作者：
Sakai, S;Toquenaga, Y
自然界中几乎所有的生物都表现出不同程度的非随机交配。非随机交配的两个极端结果是物种形成和性分化。异型花柱是一种性别分化的形式，被认为是为了解决两性花的雄性和雌性功能之间的冲突而进化的。我们的研究探讨了必要和充分条件，建立异型花柱使用配置个人为基础的模型。以前的模型假设一个突变表型入侵到一个单态野生型的人口。相比之下，我们的模型表明，异型花柱可以建立从一个人口与连续的表型变异，一个命题，需要更简单的假设比以前的假设。模拟结果表明，柱头和花药高度之间存在遗传连锁，这对建立花柱异长是必要的。雄蕊或柱头高度基因的显性效应不是必需的，但它们促进了花柱异长的进化。花柱异型性的演化概率还取决于柱头-花药距离与性干扰强度之间的函数关系以及花粉沉积成功的距离和概率。讨论了物种形成与性别分化的相似性和差异。
Almost all organisms in nature show nonrandom mating to different degrees. Two extreme results of nonrandom mating are speciation and sexual differentiation. Heterostyly is a form of sexual differentiation considered to have evolved to resolve conflicts between male and female functions of hermaphrodite flowers. Our study examines necessary and sufficient conditions for establishment of heterostyly using a configuration individual-based model. Previous models assume invasion of a mutant phenotype into a population with monomorphic wild phenotype. In contrast, our model demonstrates that heterostyly can be established from a population with continuous phenotypic variation, a proposition that requires simpler assumptions than the previous hypotheses. Results of our simulation show that genetic linkage between stigma and anther heights is essential for establishment of heterostyly. Dominance effects on the genes for stamen or stigma heights are not necessary, but they promote evolution of heterostyly. Probability of evolution of heterostyly also depends on the functional relationship between stigma-anther distance and strength of sexual interference, and the distance and probability of pollen deposition success. Parallelity and difference between speciation and sexual differentiation are also discussed.