Population genetics of Cordia alliodora (Boraginaceae), a neotropical tree. 2. Mating system |
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Authors: | David H. Boshier Michael R. Chase Kamaljit S. Bawa |
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Affiliation: | 1. Oxford Forestry Institute, Department of Plant Sciences, University of Oxford, South Parks Road, Oxford, OX1 3RB UK;2. Department of Biology, University of Massachusetts/Boston, Boston, Massachusetts, 02125 |
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Abstract: | A multilocus mixed mating model was used to evaluate the mating system of a natural population of Cordia alliodora (Boraginaceae), a neotropical tree. The population was highly outcrossed (tm = 0.966 ± 0.027), in agreement with results from controlled crosses. Departures from the mixed mating model were evident, suggesting some nonrandom, correlated mating. Pollen pool heterogeneity and variation in estimates of individual outcrossing rates indicated that the population may be genetically substructured. Individual outcrossing rates obtained for the samples taken from within different parts of the same tree indicated reduced levels of outcrossing due to limited sampling of the pollen pool. The incompatibility mechanism in C. alliodora, combined with variation in flowering and stand density, appears to lead to both temporal and spatial substructuring of the population. |
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