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

Norman C. Ellstrand, Andrew M. Torres and Donald A. Levin
Systematic Botany
Vol. 3, No. 4 (Winter, 1978), pp. 403-407
DOI: 10.2307/2418752
Stable URL: http://www.jstor.org/stable/2418752
Page Count: 5
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
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 ought to be inversely correlated with plant density. The relationship of apparent outcrossing to plant density was examined for wild populations of Helianthus annuus using alcohol dehydrogenase allozymes as genetic markers. The apparent rate of outcrossing varies from 0.54 to 0.91 (x̄ = 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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