Racing Pollen Tubes.

Chasan, Rebecca

doi:10.1105/tpc.4.7.747

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2011

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“…Where there is less opportunity or necessity to select among pollen genotypes (as expected among predominantly selfed plants), there is no apparent negative skewness of style lengths. These results offer an evolutionary perspective on style length distributions in plants (Mulcahy and Mulcahy 1975;Chasan 1992). Viewed in this context, styles in plants are not merely 'sterile' botanical tissues, but seem to play an important role in sieving among variable pollen grains, just as marathon race tracks sieve among variable and competing athletes.…”

Section: Resultsmentioning

confidence: 89%

Stylish lengths: Mate choice in flowers

et al. 2011

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The styles of flowers may represent an arena for pollen competition in the race to fertilize ovules. Accordingly, selection should favour a longer 'race' to better discriminate among variable pollen by increasing style length. Sampling across a taxonomically diverse range of wild and outcrossed species, we found that the distribution of style lengths within plants were skewed towards longer styles, as predicted. In self-pollinated domesticated species, where discrimination among pollen is less important, we found no such pattern. We conclude that style length is under directional selection towards longer styles as a mechanism for mate choice among pollen of variable quality.

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Section: Resultsmentioning

confidence: 89%