Mating system parameters in a tropical tree species, Shorea leprosula Miq. (Dipterocarpaceae), from Malaysian lowland dipterocarp forest

S. L. Lee, R Wickneswari V Ratnam, M. C. Mahani, A. H. Zakr

Research output: Contribution to journalArticle

42 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)693-702
Number of pages10
JournalBiotropica
Volume32
Issue number4
Publication statusPublished - 2000

Fingerprint

Shorea
Dipterocarpaceae
mating systems
reproductive strategy
lowlands
pollen
seedling
apomixis
outcrossing
genetic analysis
inbreeding
allozyme
loci
fixation
inbreeding coefficient
allele
genotype
fertilization (reproduction)
ovules
allozymes

Keywords

  • Allozyme
  • Apomixis
  • Dipterocarpaceae
  • Malaysia
  • Mating system
  • Shorea leprosula
  • Tropical lowland dipterocarp forest
  • Tropical timber species

ASJC Scopus subject areas

  • Ecology

Cite this

Mating system parameters in a tropical tree species, Shorea leprosula Miq. (Dipterocarpaceae), from Malaysian lowland dipterocarp forest. / Lee, S. L.; V Ratnam, R Wickneswari; Mahani, M. C.; Zakr, A. H.

In: Biotropica, Vol. 32, No. 4, 2000, p. 693-702.

Research output: Contribution to journalArticle

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