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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
Vol. 3, No. 4 (Winter, 1978), pp. 403-407
Published by: American Society of Plant Taxonomists
Stable URL: http://www.jstor.org/stable/2418752
Page Count: 5
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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.
Systematic Botany © 1978 American Society of Plant Taxonomists