Density-dependent regulation of the sex ratio in an annual plant.

Density-dependent regulation of the sex ratio in an annual plant. Research Abstract Details 

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Density-dependent regulation of the sex ratio in an annual plant. Abstract Text:

Sex ratios are subject to strong frequency-dependent selection regulated by the mating system and the relative male versus female investment. In androdioecious plant populations, where males co-occur with hermaphrodites, the sex ratio depends on the rate of self-fertilization by hermaphrodites and on the relative pollen production of males versus hermaphrodites. Here, we report evolutionary changes in the sex ratio from experimental mating arrays of the androdioecious plant Mercurialis annua. We found that the progeny sex ratio depended strongly on density, with fewer males in the progeny of plants grown under low density. This occurred in part because of a plastic adjustment in pollen production by hermaphrodites, which produced more pollen when grown at low density than at high density. Our results provide support for the prediction that environmental conditions govern sex ratios through their effects on the relative fertility of unisexual versus hermaphrodite individuals.

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Density-dependent regulation of the sex ratio in an annual plant. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: The American naturalist

VOLUME: 171

Page Numbers: 824-30

Journal Abbreviation: Am. Nat.

ISSN: 1537-5323

DAY: 8

MONTH: Jun

YEAR: 2008

Density-dependent regulation of the sex ratio in an annual plant. Information

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LANGUAGE: eng

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Grant and Affiliation Information for Density-dependent regulation of the sex ratio in an annual plant.

AFFILIATION: Department of Plant Sciences, South Parks Road, University of Oxford, Oxford OX1 3RB, United Kingdom. marceldorken@trentu.ca

Country: United States

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MEDLINETA: Am Nat

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