Outcrossing rates and male sterility in natural populations of Plantago coronopus |
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Authors: | K Wolff B Friso J M M van Damme |
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Institution: | (1) Department of Genetics, Centre of Biological Sciences, Kerklaan 30, 9751 NN Haren, The Netherlands;(2) Department of Botanical Ecology, Institute for Ecological Research, Weevers' Duin, Duinzoom 20a, 3233 EG Oostvoorne, The Netherlands |
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Abstract: | Summary Outcrossing rates were estimated in three populations of the gynodioecious species Plantago coronopus by means of electrophoresis of adult plants and their natural progenies. A multilocus estimation procedure was used. Heterogeneity among the pollen-pool allele frequencies did not exist either in space of in time. Differences between populations in mean outcrossing rates were large (range: 0.34–0.93), probably caused by differences in densities of flowering plants. In addition, there was considerable variability between individuals, which was at least partly caused by the presence of male sterility. Population density may, via its influence on outcrossing rates, be a factor influencing the maintenance of male sterile plants in the population. The level of outcrossing in hermaphrodites was not low enough to explain the maintenance of male steriles. Outcrossing rates in two populations, established via progeny analysis, were much lower than calculated with the fixation index, possibly indicating heterozygote advantage in these natural populations.Grassland Species Research Group Publication no. 134 |
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Keywords: | Plantago coronopus Outcrossing rates Male sterility Population density |
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