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1 December 2000 Mating System Parameters in a Tropical Tree Species, Shorea leprosula Miq. (Dipterocarpaceae), from Malaysian Lowland Dipterocarp Forest
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Abstract

The mating system in a natural population of Shorea leprosula from Malaysian lowland dipterocarp forest was quantified by allozyme analysis using the multi-locus mixed-mating model. The population was found to be predominantly outcrossed (tm = 0.837 ± 0.066). Variation in individual multi-locus outcrossing rates (range = 0.55–1.00) may have reflected variation in individual self-compatibility, heterogeneity in the pollen pool, differences in the mating neighborhood of individuals, or population substructure. Departure from the mixed-mating model was evident from the differences in pollen and ovule allele frequencies. Pollen pool heterogeneity and significant levels of biparental mating (tm − ts = 0.127, P < 0.01) indicated that the population was most probably genetically substructured. The inbreeding coefficient based on Wright's fixation index for maternal trees (Fa = −0.078) was lower than that obtained for progenies (Fe = 0.089), suggesting considerable selection against selfed progenies during growth of seedlings to reproductive size. Incidence of multiple seedlings was observed in a small proportion of seeds, but genetic analysis and genotype comparisons showed that this was not due to apomixis and may have been caused by multiple fertilization.

S. L. Lee, R. Wickneswari, M. C. Mahani, and A. H. Zakri "Mating System Parameters in a Tropical Tree Species, Shorea leprosula Miq. (Dipterocarpaceae), from Malaysian Lowland Dipterocarp Forest," BIOTROPICA 32(4), 693-702, (1 December 2000). https://doi.org/10.1646/0006-3606(2000)032[0693:MSPIAT]2.0.CO;2
Published: 1 December 2000
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