Prior selfing can mitigate the negative effects of mutual reproductive interference between coexisting congeners
Prior selfing can mitigate the negative effects of mutual reproductive interference between coexisting congeners
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DOI：
10.1111/1365-2435.13344
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发表时间：
2019-08-01
影响因子：
5.2
通讯作者：
Ushimaru, Atushi
中科院分区：
文献类型：
--
作者：
Katsuhara, Koki R.;Ushimaru, Atushi
当不止一种密切相关的植物物种共享相同的授粉生态位时，通过种间花粉转移产生的生殖干扰应限制它们的共存。然而，一些研究报道，即使没有生态位划分，在生殖干扰下，由同一传粉媒介授粉的两个本地近亲也能同域共存。我们研究了自然条件下近亲之间生殖干扰的频率依赖性，以及自主自交在减轻同属物种之间的负面生殖干扰效应中的潜在作用。我们调查了同域生长的鸭跖草 (Cc) 和 C. c.。 f.纤毛虫 (Ccfc) 种群。这些物种在栖息地偏好、开花物候和授粉生态位方面表现出很大的重叠，但很少产生杂交种。首先，我们进行了手工授粉实验，以检查异种花粉沉积对种子生产的负面影响以及自花授粉减轻这两个物种影响的潜力。然后，我们研究了生殖干扰对生殖成功的影响以及在野外自主自交的潜力。我们发现，在 Cc 和 Ccfc 中，异种花粉沉积对种子生产的显着负面影响以及先前和竞争性自花授粉的缓解作用。对于田间的这两个物种，随着竞争物种相对花丰度的增加，种内传粉者运动和繁殖成功率显着下降，尽管 Cc 对繁殖成功率的负面繁殖干扰效应低于 Ccfc。我们还发现 Cc 比 Ccfc 具有更大的自主自交潜力。我们的研究结果表明，Cc 花受竞争物种生殖干扰的影响较小，这可能是由于与 Ccfc 花相比，Cc 花具有更高的先期自交能力。对生殖干扰的敏感性的不对称性可以解释研究区域中 Cc 偏向的分布。这项研究提高了我们对先前的自主自交如何减少频繁传粉媒介访问的混合交配物种中竞争物种的负面生殖干扰效应的理解。本文提供了通俗易懂的语言摘要。
When more than one closely related plant species share the same pollination niche, reproductive interference via interspecific pollen transfer should limit their coexistence. However, some studies have reported the sympatric coexistence of two native close relatives pollinated by the same pollinators under reproductive interference, even without niche partitioning. We examined the frequency dependency of reproductive interference between close relatives in natural conditions and the potential roles of autonomous selfing in mitigating the negative reproductive interference effects between congeneric species. We investigated sympatrically growing Commelina communis (Cc) and C. c. f. ciliata (Ccfc) populations. These species exhibit very large overlaps in habitat preference, flowering phenology and pollination niche, but seldom produce hybrids. First, we conducted a hand-pollination experiment to examine the negative effects of heterospecific pollen deposition on seed production and the potential of self-pollination to mitigate the effects in both species. Then, we examined the effects of reproductive interference on reproductive success and the potential for autonomous selfing in the field. We found significant negative effects of heterospecific pollen deposition on seed production and the mitigation effects of prior and competing self-pollination, in both Cc and Ccfc. For both species in the field, intraspecific pollinator movements and reproductive success significantly decreased with an increase in the relative floral abundance of competing species, although the negative reproductive interference effect on reproductive success was lower in Cc than in Ccfc. We also found greater potential for prior autonomous selfing in Cc than in Ccfc. Our findings suggest that Cc flowers were less affected by reproductive interference from competing species, which was likely due to a higher prior selfing ability compared to Ccfc flowers. The asymmetry in susceptibility to reproductive interference may explain the Cc-biased distribution in the study area. The study improves our understanding of how prior autonomous selfing can reduce the negative reproductive interference effect from competing species in mixed-mating species with frequent pollinator visits. A plain language summary is available for this article.