Reproductive biology of a primitive angiosperm,Pseudowintera colorata (Winteraceae), and the evolution of pollination systems in theAnthophyta
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Abstract
Stigmatic exudate-eating chironomid flies (Smittia) and pollen-eating halodid beetles are the most common visitors to flowers ofPseudowintera colorata. Plants are self-incompatible. After selfing pollen tubes penetrate the nucellus; chase pollination experiments show that the incompatibility reaction occurs before fertilization. When pollen is applied to stigmas, the exudate dries rapidly and does not usually reappear. A review of anthophytes suggests that their common ancestor around 200 mya was bisexual and pollinated at least in part by nectar-seeking insects, possibly including flies. The angiosperm stigma appears to have evolved from a pollination drop mechanism via an adaxial stigmatic surface.
Key words
Primitive angiosperms Pseudowintera Winteraceae Magnoliidae gnetophytes anthophytes Self-incompatibility reproductive biologyPreview
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References
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