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- W1979735601 abstract "Observations of the habitats and relative flowering of a Clarkia species with hairy flower buds and several with hairless flower buds led to the hypothesis that long hairs on flower buds regulate bud temperature. This hypothesis predicts that hairless buds would be warmer and develop faster than hairy buds, which would be cooler, develop more slowly, and avoid high temperature stress. The hypothesis was tested by comparing flower bud growth rates and temperatures in three genetically similar biotypes of Clarkia unguiculata and in all six species of section Phaeostoma. Flower buds of the three biotypes included hairy (HY) and hairless (HN) from the same coastal population and densely hairy (HD) from an interior locality. The six species included C. unguiculata with densely hairy buds (HD) and five related species with hairless buds. Contrary to expectations, HY buds grew more rapidly than HN buds. HD buds grew more rapidly than either and also more rapidly than the hairless buds of five related species. Again contrary to expectations, the three biotypes of C. unguiculata had equivalent temperature relations, with bud temperatures mostly somewhat below air temperatures. In a comparative experiment, bud temperatures in C. unguiculata approximated air temperatures while bud temperatures in five related species mostly fell well below air temperatures. Thus, predictions of the hypothesis were not borne out. Long bud hairs apparently have minimal effect on bud growth rates and temperatures, and we conclude that physiological adaptations are more important. Bud cooling mechanisms are discussed." @default.
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- W1979735601 date "1989-12-01" @default.
- W1979735601 modified "2023-10-14" @default.
- W1979735601 title "EVOLUTIONARY MODIFICATION IN CLARKIA. II. ROLE OF FLOWER BUD PUBESCENCE IN SECTION PHAEOSTOMA" @default.
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- W1979735601 doi "https://doi.org/10.1002/j.1537-2197.1989.tb15170.x" @default.
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