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(American Journal of Botany. 1999;86:1114-1120.)
© 1999 Botanical Society of America, Inc.

Population differences in self-fertility in the "self-incompatible" milkweed Asclepias exaltata (Asclepiadaceae)1

Sara R Lipow 2, 5, Steven B Broyles 3 and Robert Wyatt 4, 6

2Department of Botany, University of Georgia, Athens, Georgia 30602; 3Department of Biological Sciences, State University of New York College at Cortland, New York 13045; and 4Institute of Ecology, University of Georgia, Athens, Georgia 30602

Individual plants of Asclepias exaltata (Asclepiadaceae) typically express an unusual self-incompatibility system under single-gene control. Hand-pollinations performed in six natural populations detected occasional self-fertile plants. The frequency of self-fertile individuals ranged from 0 to 34.0% and differed significantly among populations. Self-fertility appears to be under genetic control, as the ability of most plants (80.0 %) to set fruit following self-pollinations was identical under natural and greenhouse conditions. Seed- and fruit-set, however, were significantly lower from self- vs. cross-pollinations. Allozyme analysis of the population with the highest frequency of self-fertility revealed that adult plants were not significantly inbred. Finally, fruit-set following within-population cross-pollinations did not differ from that following wide, between-population cross-pollinations.

Key Words: Asclepiadaceae • genetic diversity • mating systems • milkweed • pollinations • pseudo-self-fertility • self-incompatibility




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