Evidence for reproductive isolate selection in Mediterranean orchids: karyotype differences compensate for the lack of pollinator specificity
Evidence for reproductive isolate selection in Mediterranean orchids: karyotype differences compensate for the lack of pollinator specificity
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DOI：
10.1098/rsbl.2004.0166
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发表时间：
2004-08-07
影响因子：
4.7
通讯作者：
Widmer, A
中科院分区：
文献类型：
--
作者：
Cozzolino, S;D'Emerico, S;Widmer, A
地中海兰花的亚族Orchidinae是高度多样化的，并显示了一系列迷人的授粉策略。根据观察，兰花与传粉者的关系往往是高度专业化和物种特异性的，达尔文和其他人认为，对不同传粉者的选择是兰花进化多样化背后的驱动力。这可能是真正的兰花，吸引不同的，专门的传粉者，作为前合子生殖障碍。然而，目前尚不清楚如何密切相关的共同开花的地中海兰花，共享传粉者生存的挑战。我们发现，种对与广义池的传粉者有显着更趋分歧的核型与不同的传粉者的种对相比。这些结果表明，核型差异，作为合子后生殖障碍可能发挥了重要作用，地中海兰花多样性的演变。
Mediterranean orchids of the subtribe Orchidinae are highly diverse and display a range of fascinating pollination strategies. Based on observations that orchid-pollinator relationships are often highly specialized and species specific, Darwin and others have argued that selection for different pollinators has been the driving force behind the evolutionary diversification of orchids. This may be true for orchids that attract different, specialized pollinators that act as prezygotic reproductive barriers. It is, however, not clear how closely related co-flowering Mediterranean orchids that share pollinators survive the challenge of sympatry. We show that species pairs with a generalized pool of pollinators have significantly more divergent karyotypes compared with species pairs with different pollinators. These results show that karyotype differences that act as postzygotic reproductive barriers may have played an important role in the evolution of Mediterranean orchid diversity.