{"title":"Does a coexisting congener of a mixed mating species affect the genetic structure and selfing rate via reproductive interference?","authors":"Koki R Katsuhara, Atushi Ushimaru, Yuko Miyazaki","doi":"10.1007/s00442-024-05607-x","DOIUrl":null,"url":null,"abstract":"<p><p>Reproductive interference is defined as an interspecific interaction that reduces fitness via mating processes. Although its ecological and evolutionary consequences have attracted much attention, how reproductive interference affects the population genetic structures of interacting species is still unclear. In flowering plants, recent studies found that self-pollination can mitigate the negative effects of reproductive interference. Selfing-biased seed production is expected to increase population-level inbreeding and the selfing rate, and limits gene flow via pollinator outcrossing among populations. We examined the population genetics of the mixed-mating annual herb Commelina communis f. ciliata, focusing on reproductive interference by the sympatric competing congener C. communis using microsatellite markers. First, we found that almost all C. c. f. ciliata populations had relatively high inbreeding coefficients. Then, comparing sympatric and allopatric populations, we found evidence that reproductive interference from a competing congener increased the inbreeding coefficient and selfing rate. Allopatric populations exhibit varied selfing rates while almost all sympatric populations exhibit extremely high selfing rates, suggesting that population selfing rates were also influenced by unexamined factors, such as pollinator limitation. Besides, our findings revealed that reproductive interference from a competing congener did not limit gene flow among populations. We present the first report on how reproductive interference affects the genetic aspects of populations. Our results suggested that the high selfing rate of C. c. f. ciliata promotes its sympatric distribution with C. communis, even in the presence of reproductive interference, although it is not clear whether reproductive interference directly causes the high selfing rate.</p>","PeriodicalId":19473,"journal":{"name":"Oecologia","volume":" ","pages":"37-45"},"PeriodicalIF":2.3000,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11489367/pdf/","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Oecologia","FirstCategoryId":"93","ListUrlMain":"https://doi.org/10.1007/s00442-024-05607-x","RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2024/8/22 0:00:00","PubModel":"Epub","JCR":"Q2","JCRName":"ECOLOGY","Score":null,"Total":0}
引用次数: 0
Abstract
Reproductive interference is defined as an interspecific interaction that reduces fitness via mating processes. Although its ecological and evolutionary consequences have attracted much attention, how reproductive interference affects the population genetic structures of interacting species is still unclear. In flowering plants, recent studies found that self-pollination can mitigate the negative effects of reproductive interference. Selfing-biased seed production is expected to increase population-level inbreeding and the selfing rate, and limits gene flow via pollinator outcrossing among populations. We examined the population genetics of the mixed-mating annual herb Commelina communis f. ciliata, focusing on reproductive interference by the sympatric competing congener C. communis using microsatellite markers. First, we found that almost all C. c. f. ciliata populations had relatively high inbreeding coefficients. Then, comparing sympatric and allopatric populations, we found evidence that reproductive interference from a competing congener increased the inbreeding coefficient and selfing rate. Allopatric populations exhibit varied selfing rates while almost all sympatric populations exhibit extremely high selfing rates, suggesting that population selfing rates were also influenced by unexamined factors, such as pollinator limitation. Besides, our findings revealed that reproductive interference from a competing congener did not limit gene flow among populations. We present the first report on how reproductive interference affects the genetic aspects of populations. Our results suggested that the high selfing rate of C. c. f. ciliata promotes its sympatric distribution with C. communis, even in the presence of reproductive interference, although it is not clear whether reproductive interference directly causes the high selfing rate.
生殖干扰被定义为通过交配过程降低适合度的种间相互作用。尽管其生态和进化后果备受关注,但生殖干扰如何影响相互作用物种的种群遗传结构仍不清楚。最近的研究发现,在有花植物中,自花授粉可以减轻生殖干扰的负面影响。自交偏向的种子生产预计会增加种群水平的近交和自交率,并限制种群间通过授粉者外交进行的基因流动。我们利用微卫星标记研究了混交一年生草本植物 Commelina communis f. ciliata 的种群遗传学,重点研究了同域竞争同系物 C. communis 的生殖干扰。首先,我们发现几乎所有 C. c. f. ciliata 种群的近交系数都相对较高。然后,通过比较同域种群和异域种群,我们发现有证据表明,来自竞争同源物的生殖干扰会增加近交系数和自交率。异源种群的自交率各不相同,而几乎所有同源种群都表现出极高的自交率,这表明种群自交率还受到授粉者限制等未考察因素的影响。此外,我们的研究结果表明,来自竞争同源物的生殖干扰并没有限制种群间的基因流动。我们首次报告了生殖干扰如何影响种群的遗传方面。我们的研究结果表明,C. c. f. ciliata的高自交率促进了它与C. communis的同域分布,即使存在生殖干扰也是如此,但生殖干扰是否直接导致了高自交率还不清楚。
期刊介绍:
Oecologia publishes innovative ecological research of international interest. We seek reviews, advances in methodology, and original contributions, emphasizing the following areas:
Population ecology, Plant-microbe-animal interactions, Ecosystem ecology, Community ecology, Global change ecology, Conservation ecology,
Behavioral ecology and Physiological Ecology.
In general, studies that are purely descriptive, mathematical, documentary, and/or natural history will not be considered.