Laboratoire de Génétique et Evolution des Populations Végétales, UMR CNRS 8016, Université des Sciences et Technologies de Lille-Lille 1, 59655 Villeneuve d'Ascq CEDEX, France.
Science. 2010 Mar 26;327(5973):1648-50. doi: 10.1126/science.1186687.
Androdioecy is a sexual system in which males co-occur with hermaphrodites, which have both male and female function. Stable androdioecy is rare in nature, and theory suggests that it requires that males sire more than twice as many offspring as hermaphrodites. In several members of the olive family (Oleaceae), androdioecy occurs with higher frequencies of males than predicted by theory. In Phillyrea angustifolia L., we found that high male frequencies can be maintained in natural populations because hermaphrodites belong exclusively to one of two self-incompatibility groups, and thus, each can fertilize only half of all pollen recipients. In contrast, males can pollinate all hermaphrodites. Thus, in this species, the reproductive disadvantage that males face due to the loss of female function is offset by the fact that all males are fully compatible with all pollen recipients.
雌雄同体是一种既有雄性功能又有雌性功能的雌雄同体存在的性系统。稳定的雌雄同体在自然界中很少见，理论认为它需要雄性比雌雄同体多生育两倍以上的后代。在橄榄科（Oleaceae）的几个成员中，雌雄同体的雄性出现频率高于理论预测。在 Phillyrea angustifolia L. 中，我们发现高雄性频率可以在自然种群中维持，因为雌雄同体仅属于两种自交不亲和群之一，因此，每个群只能使一半的花粉接受者受精。相比之下，雄性可以给所有的雌雄同体授粉。因此，在这个物种中，雄性由于失去雌性功能而面临的繁殖劣势被所有雄性与所有花粉接受者完全兼容的事实所抵消。
