Protogynous

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Dictionary Meaning and Definition on 'Protogynous'

Protogynous Meaning and Definition from Webster's Revised Unabridged Dictionary (1913)
    Protogynous \Pro*tog"y*nous\, a. [Proto + Gr. gynh` a woman.] (Bot.) Same as Proterogynous.
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Wikipedia Meaning and Definition on 'Protogynous'


Dichogamy, also known as sequential hermaphrodism, is the separation in time of gender expression in a hermaphroditic organism, a characteristic of some fishes, gastropods, crustaceans and most flowering plants. This is the opposite of simultaneous hermaphrodites, or homogamy.

In the context of the plant sexuality of flowering plants (angiosperms), there are two forms of dichogamy: protogyny—female function precedes male function—and protandry—male function precedes female function.

Historically, dichogamy has been regarded as a mechanism for reducing inbreeding (e.g., Darwin, 1862). However, a survey of the angiosperms found that self-incompatible (SI) plants, which are incapable of inbreeding, were as likely to be dichogamous as were self-compatible (SC) plants (Bertin, 1993). This finding led to a reinterpretation of dichogamy as a more general mechanism for reducing the impact of pollen-pistil interference on pollen import and export (reviewed in Lloyd & Webb, 1986; Barrett, 2002). Unlike the inbreeding-avoidance hypothesis, which focused on female function, this interference-avoidance hypothesis considers both gender functions.

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