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• W2334768710 abstract "Darwin proposed that the function of the stamen‐style polymorphism in heterostylous plants is to increase the probability of legitimate (compatible) pollinations among the floral morphs. Conspicuous pollen trimorphism in tristylous Pontederia cordata enables a test of the hypothesis. Comparison of the composition of pollen loads in naturally pollinated stigmas of intact and emasculated flowers were made at a population in Paugh Lake, Ontario, which was visited primarily by bumblebees. The magnitude of legitimate pollination was analyzed by ANOVA. In intact flowers, significant legitimate pollination was detected in the long‐styled morph only. Following emasculation legitimate pollination was evident in the long‐ and short‐styled morphs, with the mid‐styled morph just short of displaying significant legitimate pollination. Similar results were obtained by chi‐square analysis. It has been suggested that heterostyly may reduce mutual interference between maternal and paternal reproductive function. Two aspects of pollen‐stigma interference were investigated in P. cordata. The potential importance of stigmatic or stylar clogging by incompatible pollen was examined by controlled field pollinations and measurements of seed set. The results indicate that prior application of large amounts of incompatible pollen has no significant effect on the seed set of open‐pollinated inflorescences. Comparison of legitimate pollen capture in intact and emasculated flowers provided no evidence that the presence of stamens within flowers of the floral morphs interferes with the receipt of legitimate pollen. Pollen‐stigma interference remains to be demonstrated in heterostylous plants." @default.
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• W2334768710 date "1985-07-01" @default.
• W2334768710 modified "2023-10-12" @default.
• W2334768710 title "ON THE DARWINIAN HYPOTHESIS OF THE ADAPTIVE SIGNIFICANCE OF TRISTYLY" @default.
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• W2334768710 doi "https://doi.org/10.1111/j.1558-5646.1985.tb00418.x" @default.
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