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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Postzygotic isolating factor in sympatric speciation in Rhagoletis flies: Reduced response of hybrids to parental host-fruit odors.
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Postzygotic isolating factor in sympatric speciation in Rhagoletis flies: Reduced response of hybrids to parental host-fruit odors.

机译：Rhagoletis蝇的同胞形成中的合子后隔离因子蝇：杂种对亲本寄主果气味的反应降低。

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摘要

Rhagoletis pomonella is a model for sympatric speciation (divergence without geographic isolation) by means of host-plant shifts. Many Rhagoletis species are known to use fruit odor as a key olfactory cue to distinguish among their respective host plants. Because Rhagoletis rendezvous on or near the unabscised fruit of their hosts to mate, behavioral preferences for fruit odor translate directly into premating reproductive isolation among flies. Here, we report that reciprocal F(1) hybrids between the apple and hawthorn host races of R. pomonella, as well as between the host races and an undescribed sibling species infesting Cornus florida (flowering dogwood) do not respond to host fruit volatiles in wind-tunnel assays at doses that elicit maximal directed flight in parental flies. The reduced ability of hybrids to orient to fruit volatiles could result from a conflict between neural pathways for preference and avoidance behaviors, and it suggests that hybrids might suffer a fitness disadvantage for finding fruit in nature. Therefore, host-specific mating may play a dual role as an important postzygotic as well as a premating reproductive barrier to isolate sympatric Rhagoletis flies.
机译：Rhagoletis pomonella是通过寄主植物转移而进行同胞形态形成（无地理隔离的差异）的模型。已知许多Rhagoletis物种使用果实气味作为关键嗅觉线索，以区分其各自的寄主植物。由于Rhogoletis在其宿主未摘除的果实上或附近会合，因此，对于气味的行为偏好会直接转化为过早的果蝇生殖隔离。在这里，我们报道苹果和山楂寄主R. pomonella之间的相互F（1）杂种，以及寄主种族与未描述的同胞种Cornos florida（开花的山茱wood）之间的互作F（1）不会对寄主果实中的挥发性物质做出反应风洞试验的剂量可引起亲蝇的最大定向飞行。杂种定向到水果挥发物的能力降低可能是由于偏好和回避行为的神经途径之间的冲突所致，这表明杂种在自然界中寻找水果可能会遇到不利的适应性。因此，寄主特异的交配可能起着双重作用，作为重要的后合子以及隔离同胞Rhagoletis蝇的繁殖生殖屏障。

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