dichogamy


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Related to dichogamy: heterostyly

dichogamy

the maturation of anthers and ovules in a flower at different times.
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Outcrossing is mainly achieved through dioecy and SI, promoted by dichogamy, and facilitated by wind pollination.
It is not surprising, then, that dichogamy involving some kind of protogyny (e.
A particular group of traits regularly co-occur: species that evolved dioecy via monoecy often show sexual specialization or compensation, they may be able to change sex, they display spatial segregation of the sexes, and they appear to have evolved primarily from ancestors that already produced unisexual flowers and possessed an outbreeding device such as dichogamy (so they would not be candidates for the IA model).
We have used Bertin's (1993a) data on dichogamy (an outbreeding system) and Bierzchudek and Eckhart's (1988) data on the spatial segregation of the sexes to determine if there is an association between plants that display spatial segregation of the sexes and families that exhibit dichogamy (those species that evolved via the monoecious route).
Table I The incidence of spatial segregation of the sexes and dichogamy
We have analyzed the proportion of species within the family known to display dichogamy.