Enantiostyly
Under Enantiostylie (in German: Schiefgriffligkeit) is understood in the Botany the phenomenon that, in some types of the stylus in the female flowering stage of the stamens away from the axis core of Cocked (dextrostylous or sinstrostylous) and thus self-pollination prevent. It is a form of reciprocal herogamy . It often occurs in nectarless species, the flowers are also mostly disc-shaped, and it is often combined with heteranthropy , the different formation of the anthers .
A distinction is made between dimorphic and monomorphic non-reciprocal enantiostyly, in the dimorphic form the styles of all flowers or inflorescences on different individuals of a population incline in the same direction, in the monomorphic form the styles of the flowers in the inflorescences on an individual incline mixed or all equally to the left or right, the mixed distributed can be arranged arbitrarily or alternately, alternating (pendulum asymmetry) in the inflorescences. The reciprocal enatostyly is also possible, here the styles and also the stamens incline to the other side.
Enantiostyly is a form of spatial separation of male and female sex in a flower ( hercogamy ) and is often coupled with a temporal separation ( dichogamy ). Another form of stylus adaptation is heterostyly (different grips).
literature
- Linley K. Jesson & Spencer CH Barrett: Enantiostyly: Solving the puzzle of mirror-image flowers. In: Nature. 417 (707), 2002, p. 707, doi : 10.1038 / 417707a .
Individual evidence
- ↑ a b Pat Willmer: Pollination and Floral Ecology. Princeton Univ. Press, 2011, ISBN 978-0-691-12861-0 , pp. 74, 80.
- ↑ Thomas J. Givnish, Kenneth J. Sytsma: Molecular Evolution and Adaptive Radiation. Cambridge Univ. Press, 1997, ISBN 0-521-57329-7 , p. 236.
- ↑ Spencer CH Barrett: The evolution of plant sexual diversity. In: Nature Reviews Genetics. 3, 2002, pp. 274–284, doi : 10.1038 / nrg776 , online (PDF, 3.4 MB) at mihantarjomeh.com, accessed on December 7, 2017.