Testing the ‘assortative mating’ hypothesis on a variation maintenance mechanism for flowering time within a forest‐floor population of Primula sieboldii
Testing the ‘assortative mating’ hypothesis on a variation maintenance mechanism for flowering time within a forest‐floor population of Primula sieboldii
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DOI：
10.1046/j.1442-1984.2003.00084.x
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发表时间：
2003-04
影响因子：
1.4
通讯作者：
Yasushi Okayama;Mihoko Nagai;I. Washitani
中科院分区：
文献类型：
--
作者：
Yasushi Okayama;Mihoko Nagai;I. Washitani
为了验证三叶报春花（Primula sieboldii E. Morren）自然种群在开花时间上是否存在正配交配，研究了开花物候和等位酶变异。三叶报春花是一种落叶林中约180个基因组成的多年生异花柱草本植物。花期在不同基因间有显著差异，但在异花柱形态间无显著差异。在两年的研究中，各基因的开花时间顺序基本保持不变。在开花季节，研究点光有效性的空间异质性较小。为了分析早花和晚花基因群之间的遗传分化程度，对10个位点的等位酶多样性进行了分析。早花期组和晚花期组的GST无显著差异。没有发现开花时间正分类交配的证据。花粉限制导致的花期延长可能是抑制早、晚花期群体遗传分化的重要因素之一。
Flowering phenology and allozyme variation were studied to test the existence of positive assortative mating for flowering time in a natural population of Primula sieboldii E. Morren, a heterostylous perennial herb, consisting of approximately 180 genets in a deciduous forest. There was significant variation in flowering date among genets, but not between heterostylous morphs. The temporal order of the flowering time of genets was fairly constant for the two years of the study. The spatial heterogeneity of light availability at the study site was small during the flowering season of the species. In order to analyze the extent of genetic differentiation between early- and late-flowering genet groups, allozyme diversities were analyzed with 10 loci. The GST between the early- and late-flowering groups was not significantly different from zero. Evidence of positive assortative mating for flowering time was not detected. Prolongation of flowering duration due to pollen limitation may be one important factor preventing the genetic differentiation of early- and late-flowering groups by enhancing the overlap of flowering time among genets.