Dichogamy


Also found in: Dictionary, Medical, Wikipedia.
Related to Dichogamy: heterostyly

dichogamy

[dī′käg·ə·mē]
(biology)
Producing mature male and female reproductive structures at different times.

Dichogamy

 

the maturation of the anthers and stigmas of flowers at different times. The importance of dichogamy for cross-pollination was first noted by A. T. Bolotov in 1780. In some flowers the anthers are the first to mature (protandry), and in others it is the stigma (protogyny). Dichogamy occurs not only in bisexual flowers but also in the unisexual flowers of monoecious and dioecious plants. Dichogamy is termed complete if the stigmas mature after the wilting of the stamens (or vice versa). More often dichogamy is incomplete, that is, the later maturing organs attain sexual maturity while the organs of the opposite sex have not lost their function. Protandry occurs in almost all the plants of the families Compositae and Umbelliferae. Protogyny is encountered more rarely, for example, in plants of the families Cruciferae, Rosaceae, and Ranunculaceae (anemones). The maturation of organs of different sexes at different times in cryptogams is also termed dichogamy.

References in periodicals archive ?
New (evolutionary) aspects are also expected by comparison of symmetry types with other features, such as genetics of breeding systems via dichogamy (Kalisz et al., 2006), or with floral variability (Herrera et al., 2008).
Here we suggest that it could also be a case of herkogamy or dichogamy, preventing selfing.
Dichogamy (time delay between expression of male and female functions within flowers) and pollinator movements on inflorescences can create different transfer probabilities for pollen at different positions and thus influence sex allocation.
Plants have evolved a variety of traits that have been interpreted as adaptations to avoid inbreeding, including separation of male and female flowers in space and time (dioecy, dichogamy), distinctive floral polymorphisms (e.g., heterostyly), and various self-incompatibility mechanisms (Darwin, 1876; Bateman, 1952; Faegri and van der Pijl, 1979; Dickinson, 1994).
The influence of pollinator directionality on fruit and seed set will depend on the order of floral development, the degree of dichogamy, and the level of inbreeding depression.
Dichogamy (temporal displacement of anther and stigma maturation within the flower) is widespread among the angiosperms.
Low-copy nuclear DNA, phylogeny and the evolution of dichogamy in the betel nut palms and their relatives (Arecinae; Arecaceae).
The failure of individual flowers to self may be due to [TABULAR DATA FOR TABLE 3 OMITTED] dichogamy, or temporal separation of pollen release and stigma receptivity.
Second, SC plants commonly exhibit floral traits, particularly the spatial or temporal separation of male and female organs (herkogamy, dichogamy, certain manifestations of monoecy) that usually have been assumed to have evolved to reduce inbreeding.
Dichogamy is remarkably widespread within the angiosperms (Bertin
Most Begonia species exhibit characters that promote outcrossing: The large majority of species are monoecious and in many the male and female phases are temporally separated (dichogamy).
The interaction of gynomoecy, dichogamy, and wind-pollination in Gunneraperpensa L.