Pleiotropic effects of an allele producing white flowers in Ipomoea purpurea
Pleiotropic effects of an allele producing white flowers in Ipomoea purpurea
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DOI：
10.1111/j.1558-5646.2008.00355.x
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发表时间：
2008-05-01
期刊：
影响因子：
3.3
通讯作者：
Rausher, Mark D.
中科院分区：
文献类型：
--
作者：
Coberly, L. Caitlin;Rausher, Mark D.
虽然人们普遍认为传粉者是驱动花色进化的主要选择因子，但最近有人提出，影响花色的突变的多效性效应可能是花进化的重要制约因素。我们研究了这一假设，使用普通牵牛花，Ipomoea purpurea的白花变种。先前的实验表明，白花a等位基因具有传递优势，因为增加了自交和没有检测到的花粉折扣。我们证实了这种传输优势，使用大型田间试验中，自交率和异交成功率进行了测量，所有三种基因型在A位点。我们还表明，这种传输优势是反对明显的多效性效应，在aa个人表现为减少从发芽到开花的生存。这种效应的大小，加上已知的近亲繁殖衰退的大小，超过了传播优势的补偿。因此，我们的研究结果支持有害多效性可能会影响花色突变体的进化轨迹的概念。
Although it is generally believed that pollinators are the primary selective agents driving flower-color evolution, it has recently been suggested that pleiotropic effects of mutations affecting flower color may serve as important constraints on floral evolution. We examined this hypothesis using white-flowered variants of the common morning glory, Ipomoea purpurea. Previous experiments indicate that the white-flowered a allele has a transmission advantage because of increased selfing and no detectable pollen discounting. We confirm this transmission advantage using a large field experiment in which both selfing rate and outcross success were measured for all three genotypes at the A locus. We also demonstrate that this transmission advantage is opposed by apparent pleiotropic effects in aa individuals manifested as reduced survival from germination to flowering. The magnitude of this effect, in combination with the known magnitude of inbreeding depression, more than compensates for the transmission advantage. Our results thus support the notion that deleterious pleiotropy may influence the evolutionary trajectory of flower-color mutants.