ANDRODIOECY AND THE EVOLUTION OF DIOECY
ANDRODIOECY AND THE EVOLUTION OF DIOECY
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DOI：
10.1111/j.1095-8312.1984.tb01683.x
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发表时间：
1984-01-01
影响因子：
1.9
通讯作者：
CHARLESWORTH, D
中科院分区：
文献类型：
--
作者：
CHARLESWORTH, D
的可能性，diodiopathy可以通过androdiodiopathy演变进行检查。雌性不育突变不太可能侵入自交亲和的雌雄同体物种的种群，即使雌雄同体用于种子生产的资源可以转移到提高生存率和提高雄性生育力。这些发现与雄甾烯的稀有性相一致。对声称的雌雄异株的案例进行了审查。所有物种[三白草属，Nivenia、Datisca glomerata、Decaspermum、Acer、Dipteronia、Nothospondias、Spondianthus、Ternstroemia、Symplocos、Camperia、Colpoon、Fusanus、Nanodea、Erythrina montana、Nephropylappaceum、Dapania]似乎在功能上是雌雄异株的，雌性保留了大量的花药痕迹。有人认为，这种形态学的androdiopathy是在没有办法表明以前的功能androdioecious状态。这些物种的生殖生物学细节似乎与它们通过雌蕊异生体进化出异生体相一致。雄二雄的稀有性，作为一种途径的进化diodiopsis，表明生殖资源的重新分配是不太可能是唯一的重要因素，并支持避免近亲繁殖的重要作用。某些雌雄异株物种中的雌性保留着相当大的花药，含有相当数量的花粉，这一事实进一步支持了这样一种观点，即雄性不育突变有时可能是有利的，即使很少或没有资源被重新分配给雄性功能。如果没有大量的自交和近交，这是不可能的。避免近亲繁殖在雌雄异株的进化中通常是重要的，尽管生殖资源的重新分配也是必要的。
The likelihood that dioecy could evolve via androdioecy is examined. Female-sterility mutations are unlikely to be able to invade populations of self-compatible hermaphrodite species, even if the resources that an hermaphrodite devotes to seed production can be diverted to yield increased survival and also to increase male fertility. These findings are in agreement with the great rarity of androdioecy. Claimed cases of androdioecy are reviewed. All of the species [Saurauia spp., Nivenia, Datisca glomerata, Decaspermum, Acer, Dipteronia, Nothospondias, Spondianthus, Ternstroemia, Symplocos, Camperia, Colpoon, Fusanus, Nanodea, Erythrina montana, Nephelium lappaceum, Dapania] in question appear to be functionally dioecious, with females retaining substantial anther vestiges. It is argued that this morphological androdioecy is in no way indicative of a previous functionally androdioecious state. The details of the reproductive biology of many of these species seem rather to be consistent with their having evolved dioecy via gynodioecy. The rarity of androdioecy, as a route to the evolution of dioecy, suggests that re-allocation of reproductive resources is unlikely to be the sole factor of importance, and supports an important role for inbreeding avoidance. The fact that females in some dioecious species retain anthers of substantial size, containing considerable quantities of pollen, gives further support to the view that male-sterility mutations can sometimes be favored even when little or no resources are re-allocated to male functions. This is impossible without substantial selfing and inbreeding. Inbreeding avoidance is generally important in the evolution of dioecy, though reallocation of reproductive resources is also necessary.