Genetic diversity of a tropical tree species, Shorea leprosula Miq. (Dipterocarpaceae), in Malaysia: Implications for conservation of genetic resources and tree improvement

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

Research output: Contribution to journalArticle

46 Citations (Scopus)

Abstract

Genetic diversity and population genetic structure of Shorea leprosula was investigated using seven natural populations distributed throughout Peninsular Malaysia and one natural population from Borneo. The mean population and species level genetic diversity were exceptionally high (H(e) = 0.369 ± 0.025 and 0.406 ± 0.070, respectively). Heterozygosity varied among populations, ranging from 0.326 to 0.400, with the highest values found in the populations from central Peninsular Malaysia. Correlations among ecological factors (longitude, latitude, and annual rainfall) were not significant (P > 0.05), indicating that these ecological variables were not responsible for the observed genetic differences among populations. The Bangi adult population exhibited a higher level of observed heterozygosity but lower fixation indices in comparison to its seedling population. All other seedling populations also showed positive fixation indices (F), indicating a general excess of homozygotes. This also may suggest selection against homozygotes between the seedling and adult stages. A low level of population differentiation was detected (G(ST) = 0.117 with the Lambir population and G(ST) = 0.085 without the Lambir population). Furthermore, gene flow (N(m)) between populations was not significantly correlated with geographical distances for the populations within Peninsular Malaysia. Cluster analysis also did not reflect geographical proximity and gave little insight into the genetic relatedness of the populations. This may indicate that the populations sampled are part of a continuous population with fragmentation having occurred in the recent past.

Original languageEnglish
Pages (from-to)213-224
Number of pages12
JournalBiotropica
Volume32
Issue number2
Publication statusPublished - Jun 2000

Fingerprint

Shorea
Dipterocarpaceae
germplasm conservation
Malaysia
seedling
heterozygosity
genetic variation
fixation
relatedness
genetic structure
population genetics
gene flow
cluster analysis
fragmentation
rainfall
conservation of genetic resources
genetic diversity
homozygosity
seedlings
index

Keywords

  • Allozyme
  • Dipterocarpaceae
  • Genetic conservation
  • Genetic diversity
  • Malaysia
  • Population genetic structure
  • Shorea leprosula
  • Tree improvement
  • Tropical lowland and coastal hill dipterocarp forests
  • Tropical timber species

ASJC Scopus subject areas

  • Ecology

Cite this

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title = "Genetic diversity of a tropical tree species, Shorea leprosula Miq. (Dipterocarpaceae), in Malaysia: Implications for conservation of genetic resources and tree improvement",
abstract = "Genetic diversity and population genetic structure of Shorea leprosula was investigated using seven natural populations distributed throughout Peninsular Malaysia and one natural population from Borneo. The mean population and species level genetic diversity were exceptionally high (H(e) = 0.369 ± 0.025 and 0.406 ± 0.070, respectively). Heterozygosity varied among populations, ranging from 0.326 to 0.400, with the highest values found in the populations from central Peninsular Malaysia. Correlations among ecological factors (longitude, latitude, and annual rainfall) were not significant (P > 0.05), indicating that these ecological variables were not responsible for the observed genetic differences among populations. The Bangi adult population exhibited a higher level of observed heterozygosity but lower fixation indices in comparison to its seedling population. All other seedling populations also showed positive fixation indices (F), indicating a general excess of homozygotes. This also may suggest selection against homozygotes between the seedling and adult stages. A low level of population differentiation was detected (G(ST) = 0.117 with the Lambir population and G(ST) = 0.085 without the Lambir population). Furthermore, gene flow (N(m)) between populations was not significantly correlated with geographical distances for the populations within Peninsular Malaysia. Cluster analysis also did not reflect geographical proximity and gave little insight into the genetic relatedness of the populations. This may indicate that the populations sampled are part of a continuous population with fragmentation having occurred in the recent past.",
keywords = "Allozyme, Dipterocarpaceae, Genetic conservation, Genetic diversity, Malaysia, Population genetic structure, Shorea leprosula, Tree improvement, Tropical lowland and coastal hill dipterocarp forests, Tropical timber species",
author = "Lee, {S. L.} and {V Ratnam}, {R Wickneswari} and Mahani, {M. C.} and Zakri, {A. H.}",
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T1 - Genetic diversity of a tropical tree species, Shorea leprosula Miq. (Dipterocarpaceae), in Malaysia

T2 - Implications for conservation of genetic resources and tree improvement

AU - Lee, S. L.

AU - V Ratnam, R Wickneswari

AU - Mahani, M. C.

AU - Zakri, A. H.

PY - 2000/6

Y1 - 2000/6

N2 - Genetic diversity and population genetic structure of Shorea leprosula was investigated using seven natural populations distributed throughout Peninsular Malaysia and one natural population from Borneo. The mean population and species level genetic diversity were exceptionally high (H(e) = 0.369 ± 0.025 and 0.406 ± 0.070, respectively). Heterozygosity varied among populations, ranging from 0.326 to 0.400, with the highest values found in the populations from central Peninsular Malaysia. Correlations among ecological factors (longitude, latitude, and annual rainfall) were not significant (P > 0.05), indicating that these ecological variables were not responsible for the observed genetic differences among populations. The Bangi adult population exhibited a higher level of observed heterozygosity but lower fixation indices in comparison to its seedling population. All other seedling populations also showed positive fixation indices (F), indicating a general excess of homozygotes. This also may suggest selection against homozygotes between the seedling and adult stages. A low level of population differentiation was detected (G(ST) = 0.117 with the Lambir population and G(ST) = 0.085 without the Lambir population). Furthermore, gene flow (N(m)) between populations was not significantly correlated with geographical distances for the populations within Peninsular Malaysia. Cluster analysis also did not reflect geographical proximity and gave little insight into the genetic relatedness of the populations. This may indicate that the populations sampled are part of a continuous population with fragmentation having occurred in the recent past.

AB - Genetic diversity and population genetic structure of Shorea leprosula was investigated using seven natural populations distributed throughout Peninsular Malaysia and one natural population from Borneo. The mean population and species level genetic diversity were exceptionally high (H(e) = 0.369 ± 0.025 and 0.406 ± 0.070, respectively). Heterozygosity varied among populations, ranging from 0.326 to 0.400, with the highest values found in the populations from central Peninsular Malaysia. Correlations among ecological factors (longitude, latitude, and annual rainfall) were not significant (P > 0.05), indicating that these ecological variables were not responsible for the observed genetic differences among populations. The Bangi adult population exhibited a higher level of observed heterozygosity but lower fixation indices in comparison to its seedling population. All other seedling populations also showed positive fixation indices (F), indicating a general excess of homozygotes. This also may suggest selection against homozygotes between the seedling and adult stages. A low level of population differentiation was detected (G(ST) = 0.117 with the Lambir population and G(ST) = 0.085 without the Lambir population). Furthermore, gene flow (N(m)) between populations was not significantly correlated with geographical distances for the populations within Peninsular Malaysia. Cluster analysis also did not reflect geographical proximity and gave little insight into the genetic relatedness of the populations. This may indicate that the populations sampled are part of a continuous population with fragmentation having occurred in the recent past.

KW - Allozyme

KW - Dipterocarpaceae

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KW - Genetic diversity

KW - Malaysia

KW - Population genetic structure

KW - Shorea leprosula

KW - Tree improvement

KW - Tropical lowland and coastal hill dipterocarp forests

KW - Tropical timber species

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