1246719517

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AID: 1246719517
Английский
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Effects of Natural Rates of Geitonogamy on Fruit Set in Asclepias speciosa (Apocynaceae): Evidence Favoring the Plant's Dilemma
American Journal of Botany, . Т. 90. 12. С. 17461750 (5).
The role of geitonogamy in the evolution of inflorescence design is not well understood. The plant's dilemma hypothesis proposes that evolution of larger inflorescences is driven by selection for greater pollinator attraction, but constrained by higher rates of geitonogamy experienced by larger inflorescences. Here we investigate the role of geitonogamy on fruit set in natural populations of Asclepias speciosa. We compared fruit set from three pollination treatments: (1) inflorescences bagged before and after receiving 6 hand outcross pollinia (Bag), (2) inflorescences unbagged and receiving 6 hand outcross pollinia (Open), and (3) naturally pollinated inflorescences (Control). The Bag and Open treatments initiated significantly more fruits than the Control. Bag aborted significantly fewer fruits than Open or Control. Fruit set was significantly higher in Bag than Open, and Open had significantly higher fruit set than Control. From these results, we conclude that (1) high rates of geitonogamy significantly increase fruit abortion and reduce fruit set in natural populations of A. speciosa and (2) natural populations are compatible pollen limited. Both findings are consistent with the plant's dilemma hypothesis.
ТЕМАТИЧЕСКИЕ СПИСКИ
Ключевые словаInflorescence design, Plant's dilemma, Опыление, Geitonogamy
Таксоны растенийAsclepias speciosa

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