heterostyly


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heterostyly

a combination of the morphological and physiological mechanisms that promote cross-pollination in flowering plants. Structurally, there are usually two flower forms (e.g. the ‘pin’ and ‘thrum’ forms of the primrose) which ensure that the pollen collected from the stamens of one type is deposited on the stigma of the other (see ENTOMOPHILY). There is also SELF-INCOMPATIBILITY between pollen and stigma from the same flower type, although there is compatibility between flowers of different types. Compare HOMOSTYLY.
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The occurrence of subgene G in buckwheat outside the heterostyly locus.
A molecular phylogeny of the Lythraceae and inference of the evolution of heterostyly.
It would be useful to determine whether reduced stigma-anther separation, lack of cryptic self-incompatibility, or both are responsible for the lower outcrossing rates measured in these latter two species, especially because competing theories for the evolution of heterostyly hinge on the order of acquisition of incompatibility (Charlesworth and Charlesworth 1978; Lloyd and Webb 1992).
Barrett (1992: 1) defined heterostyly as "a genetic
Other papers consider the adaptive significance of various floral features, such as flower lifespan, flower size dimorphisms, deceitfully nectarless flowers and heterostyly.
Sometimes, variation can be linked with heterostyly or coincides with infraspecific taxa.
The genetical architecture of heterostyly in Primula sinensis.
bilateral symmetry, flag-flowers, trap flowers and the "struggle for space" within the bud; "Floral Adaptation" which looks at different pollinators (mode, style) (Chapter 4) gives us a fascinating array of co-evolutionary syndromes; "Special Differentiations of Pollinator Attractions" (Chapter 5) covers nectaries, elaiophores, perfumes, optical displays, and visual clues; "Special Differentiations Associated with Breeding Systems" (Chapter 6) deals with sex expression, heterostyly, and male/female allocation; and finally "The Process of Anthesis" (Chapter 7) focuses on structural changes during flowering, longevity, rhythmicity, the flowering within individuals and whole populations (Gentry's "Big Bang" species vs.
An important issue concerned with the evolution of heterostyly is the order of establishment of the morphological and physiological components of the syndrome (Barrett 1992).
In the two Psychotria colonists, separate sexes probably were derived from heterostyly.
Autogamy, dominance, flower size, heterosis, heterostyly, homeostasis, mating system, mutation rate, mutation-selection balance, overdominance, pollination, polyploidy.