Density and the Rate of Apparent Outcrossing in Helianthus annuus (Asteraceae)

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Abstract
Previous studies on pollinator foraging behavior suggest that the apparent rate of outcrossing may be inversely correlated with plant density. The relationship of apparent outcrossing to plant density was examined for wild populations of H. annuus using alcohol dehydrogenase allozymes as genetic markers. The apparent rate of outcrossing varies from 0.54 to 0.91 (.hivin.y = 0.76) and is significantly inversely correlated with plant density. Heterozygote deficiency in the progeny also shows a significant inverse correlation. The proportion of heterozygotes in the maternal generation is not related to the rate of outcrossing.

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