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首页> 外文期刊>Evolution: International Journal of Organic Evolution >The genetic architecture of reproductive isolation in louisiana irises: Pollination syndromes and pollinator preferences
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The genetic architecture of reproductive isolation in louisiana irises: Pollination syndromes and pollinator preferences

机译：路易斯安那州虹膜生殖隔离的遗传结构：授粉综合征和授粉媒介偏好

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摘要

In animal-pollinated plants, pollinator preferences for divergent floral forms can lead to partial reproductive isolation. We describe regions of plant genomes that affect pollinator preferences for two species of Louisiana Irises, Iris brevicaulis and Iris fulva, and their artificial hybrids. Iris brevicaulis and I. fulva possess bee and bird-pollination syndromes, respectively. Hummingbirds preferred I. fulva and under-visited both I. brevicaulis and backcrosses toward this species. Lepidopterans preferred I. fulva and backcrosses toward I. fulva, but also under-visited I. brevicaulis and I. brevicaulis backcrosses. Bumblebees preferred I. brevicaulis and F-1 hybrids and rarely visited I. fulva. Although all three pollen vectors preferred one or the other species, these preferences did not prevent visitation to other hybrid/parental classes. Quantitative trait locus (QTL) mapping, in reciprocal BC1 mapping populations, defined the genetic architecture of loci that affected pollinator behavior. We detected six and nine QTLs that affected pollinator visitation rates in the BCIb and BCIf mapping populations, respectively, with as many as three QTLs detected for each trait. Overall, this study reflects the possible role of quantitative genetic factors in determining (1) reproductive isolation, (2) the pattern of pollinator-mediated genetic exchange, and thus (3) hybrid zone evolution.
机译：在动物授粉的植物中，传粉媒介对不同花型的偏爱可能导致部分生殖隔离。我们描述了植物基因组区域，该区域影响路易斯安那州鸢尾的两个物种，鸢尾鸢尾和鸢尾鸢尾及其人工杂交的授粉媒介偏好。虹膜短尾鸢尾和富叶鸢尾分别患有蜜蜂和鸟类授粉综合症。蜂鸟偏爱富勒氏菌，而对这种物种的短毛隐孢子虫和回交率均偏低。鳞翅目动物偏爱富勒艾弗尔氏菌和回交，而不偏爱富勒艾弗尔氏菌，但访问率不高的是短尾I和短尾au回交。大黄蜂更喜欢短杆菌属和F-1杂种，很少见到富勒氏菌。尽管所有三个花粉载体都优选一个或另一个物种，但这些偏好并不能阻止访问其他杂种/亲本类型。在反向BC1作图种群中，数量性状基因座（QTL）作图定义了影响授粉媒介行为的基因座的遗传结构。我们分别在BCIb和BCIf测绘种群中检测到六个和9个QTL，它们分别影响传粉者的访视率，每个性状最多检测到三个QTL。总的来说，这项研究反映了定量遗传因素在确定（1）生殖隔离，（2）传粉媒介介导的遗传交换模式以及（3）杂交区进化方面的可能作用。

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