Hermaphroditism promotes mate diversity in flowering plants
Hermaphroditism promotes mate diversity in flowering plants
复制标题
雌雄同体促进开花植物的配偶多样性
DOI：
10.1002/ajb2.1336
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发表时间：
2019-08-01
影响因子：
3
通讯作者：
Karron, Jeffrey D.
中科院分区：
文献类型：
--
作者：
Christopher, Dorothy A.;Mitchell, Randall J.;Karron, Jeffrey D.
人们认为前提在遗传上多样化会通过降低SIB竞争的强度以及在空间或时间上异质性环境中增加幼苗建立的机会来提高父母的健康状况。几乎所有关于开花植物伴侣多样性的研究都集中在水果或母体植物中的父亲的数量上。然而，作为雌雄同体，植物还可以通过对人群中的几个花粉接受者的后代来累积伴侣的多样性。在这里，我们探讨了伴侣的组成是否在双重性功能之间重叠，并讨论对植物生殖成功的影响。方法我们建立了49个Mimulus Ringens（Monkeyflower）植物的实验人群，每个植物都将其修剪成一朵花。在野生蜜蜂的授粉之后，我们通过父亲和母体功能对每朵花的伴侣组成进行了定量。父母成功分配给240个后代，占采样种子的98％。男性和女性功能之间伴侣组成的结果比较表明，伴侣的多样性高，几乎没有同一花的两种性功能之间共享截面的伴侣。结论双重性角色在我们的Mimulus Ringens实验人群中几乎使伴侣多样性几乎增加了一倍。这一发现可能有助于解释雌雄同体的维持，否则将有利于单独性别的演变。
Premise Genetically diverse sibships are thought to increase parental fitness through a reduction in the intensity of sib competition, and through increased opportunities for seedling establishment in spatially or temporally heterogeneous environments. Nearly all research on mate diversity in flowering plants has focused on the number of fathers siring seeds within a fruit or on a maternal plant. Yet as hermaphrodites, plants can also accrue mate diversity by siring offspring on several pollen recipients in a population. Here we explore whether mate composition overlaps between the dual sex functions, and discuss the implications for plant reproductive success. Methods We established an experimental population of 49 Mimulus ringens (monkeyflower) plants, each trimmed to a single flower. Following pollination by wild bees, we quantified mate composition for each flower through both paternal and maternal function. Parentage was successfully assigned to 240 progeny, 98% of the sampled seeds. Results Comparison of mate composition between male and female function revealed high mate diversity, with almost no outcross mates shared between the two sexual functions of the same flower. Conclusions Dual sex roles contribute to a near doubling of mate diversity in our experimental population of Mimulus ringens. This finding may help explain the maintenance of hermaphroditism under conditions that would otherwise favor the evolution of separate sexes.