Reciprocal herkogamy promotes disassortative mating in a distylous species with intramorph compatibility
Reciprocal herkogamy promotes disassortative mating in a distylous species with intramorph compatibility
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互惠的雌雄同配促进了具有内型相容性的双柱物种的不配型交配。
DOI：
10.1111/nph.13326
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发表时间：
2015-06-01
期刊：
影响因子：
9.4
通讯作者：
Li, De-Zhu
中科院分区：
文献类型：
--
作者：
Zhou, Wei;Barrett, Spencer C. H.;Li, De-Zhu
由于生态和生殖因素影响花粉扩散，具有种内亲和性的异花柱物种的交配模式有可能偏离对称的错配交配。在这里，我们研究的潜在和已实现的交配模式在远期的紫露草(茜草科)，一种内形态相容的物种。我们的分析提供了一个机会来检验达尔文的假设，即互惠的异族婚配促进了不相称的花粉转移。我们结合性器官互惠和花粉产生的测量方法来预测中国西南种群中潜在的花粉转移和交配模式。然后，基于标记的父子关系分析被用来估计在个体和花形态水平上实现的杂色和杂色交配模式。潜在的和已实现的交配模式都表明了错配交配的重要组成部分，满足了维持花的二型性的理论条件。配合性交配水平(37.7%)显著低于非配合性交配水平(62.3%)，但大多数母本种子家系在两种花形态中都检测到大量的内交配后代。我们的结果支持达尔文关于互惠异花配子功能的交叉促进假说，但表明在大多数异花柱物种中，强烈的双等位不亲和性可能是完全错配交配的普遍要求。
Mating patterns in heterostylous species with intramorph compatibility have the potential to deviate from symmetrical disassortative mating owing to ecological and reproductive factors influencing pollen dispersal. Here, we investigate potential and realized patterns of mating in distylous Luculia pinceana (Rubiaceae), a species with intramorph compatibility. Our analysis provides an opportunity to test Darwin's hypothesis that reciprocal herkogamy promotes disassortative pollen transfer. We combined measurements of sex-organ reciprocity and pollen production to predict potential pollen transfer and mating patterns in a population from SW China. Marker-based paternity analysis was then used to estimate realized patterns of disassortative and assortative mating at the individual and floral morph levels. Both potential and realized mating patterns indicated a significant component of disassortative mating, satisfying theoretical conditions for the maintenance of floral dimorphism. Levels of assortative mating (37.7%) were significantly lower than disassortative mating (62.3%), but numerous offspring resulting from intramorph mating were detected in the majority of maternal seed families in both floral morphs. Our results provide empirical support for Darwin's cross-promotion hypothesis on the function of reciprocal herkogamy, but indicate that in most heterostylous species strong diallelic incompatibility may be a general requirement for complete disassortative mating.