Anbe/biol 356/656

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Floral-color Changes Floral-color changes are common among the angiosperms. At least three non-exclusive hypotheses have been proposed to explain these changes: 1. Once flowers are adequately pollinated, further pollinator visits impair reproduction by deposition of self-pollen, dislodging of pollen, or damage to floral parts. 2. Color changes mark flowers that have been depleted of their rewards (nectar or pollen). This could be advantageous to the plant in that it would make the plant more rewarding to pollinators and hence more likely to be visited. 3. Color changes mark sexually non-functional flowers, minimizing pollinator removal of inviable pollen or deposition of pollen on non-receptive stigmas.

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Anbe/biol 356/656

During the next two weeks, floral-color change could be investigated in Aster divaricatus or A. prenanthoides, both of which grow on my property. You could investigate one or more of the above hypotheses relative to the situation in Aster. For example, you could investigate whether the presence of color-changed flowers enhances the plant as a visual target for pollinators as well as determine w...

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تاریخ انتشار 2003