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Population genetics of Cordia alliodora (Boraginaceae), a neotropical tree. 2. Mating system
Author(s) -
Boshier David H.,
Chase Michael R.,
Bawa Kamaljit S.
Publication year - 1995
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1995.tb15667.x
Subject(s) - outcrossing , biology , mating system , boraginaceae , mating , population , pollen , botany , zoology , ecology , demography , sociology
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 (t m = 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.