Androdioecy is a rare breeding system in which low male frequency is expected in populations because males require a strong increase in their fertility to be maintained by selection. Phillyrea angustifolia L. has previously been reported as possibly functionally androdioecious. However, 1:1 sex ratios have been reported and suggest functional dioecy. In this article, we compared both pollen tube growth and siring success of male and hermaphrodite pollen in two single‐donor pollination experiments. We verified at both pre‐ and postzygotic levels that hermaphrodites produce functional pollen. Self‐incompatibility was also clearly established. However, pollen from hermaphrodites was less efficient than male pollen. The probability of a pollen tube growing through the style was higher for male than for hermaphrodite pollen donors, and males sired twice as many fruits as hermaphrodites. The twofold male advantage in relative fecundity was mainly because of lower pollen fertility of hermaphrodites and possible cross‐incompatibility among hermaphrodites.

中文翻译：

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Phillyrea angustifolia（木犀科）的自交不亲和和雄性受精成功

雄性雌雄同体是一种罕见的育种系统，其中预期种群中的雄性频率较低，因为雄性需要通过选择来维持其生育力的大幅增加。Phillyrea angustifolia L. 以前曾被报道为可能具有雄性雌雄同株。然而，已经报道了 1:1 的性别比例，并表明存在功能性的雌雄同体。在本文中，我们在两个单供体授粉实验中比较了雄性和雌雄同体花粉的花粉管生长和繁殖成功率。我们在合子前和合子后水平验证了雌雄同体产生功能性花粉。还明确确定了自交不相容性。然而，雌雄同体的花粉效率不如雄性花粉。雄性花粉管通过花柱生长的可能性高于雌雄同体花粉供体，雄性的后代果实数量是雌雄同体的两倍。雄性在相对繁殖力方面的双重优势主要是由于雌雄同体的花粉育性较低和雌雄同体之间可能存在交叉不亲和。