Genetic variation and outcrossing rates of the endangered tropical species Dipterocarpus dyeri

Duc N. M., . and Duy V. D., . and Hien D. P., . and Trang N. T. P., . and Tam N. M., . and Hong N. P. L., . and Thanh T. T. V., . and Thanh N. T., . Genetic variation and outcrossing rates of the endangered tropical species Dipterocarpus dyeri. pp. 259-267. ISSN 0128-1283

Dipterocarpus dyeri is an endangered species in lowland tropical forests of Vietnam because of habitat fragmentation and over-exploitation of this species. It plays an important economic and ecological role in Vietnam. Due to the importance and lack of information on its genetic diversity and mating system we investigated genetic parameters in adults and juveniles of this species in two natural populations about 10km apart. Eight polymorphic microsatellite loci were analysed and showed high genetic diversity in adults (HO 0.475“0.563 HE 0.551“0.649) and juveniles (HO 0.47“0.513 HE 0.576“0.685) in both populations. Results revealed differences of genetic diversity between two adult (Fst 0.123) and two juvenile populations (FST 0.188). However the differences were negligible and indicated that the fragmented habitat had negligible effect on genetic diversity. Gene flow or gene migration between two populations in adults or juveniles remained (Nm 1) although this value reduced slightly in the latter. Analysis of the mating system indicated high outcrossing rate of D. dyeri (tm 0.8). Biparental mating (tm “ ts) was relatively high (0.19“0.25) and suggested high tendency of mating system between relatives. Genetic conservation should derive from correlated outcrossing.

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Abstract

Dipterocarpus dyeri is an endangered species in lowland tropical forests of Vietnam because of habitat fragmentation and over-exploitation of this species. It plays an important economic and ecological role in Vietnam. Due to the importance and lack of information on its genetic diversity and mating system we investigated genetic parameters in adults and juveniles of this species in two natural populations about 10km apart. Eight polymorphic microsatellite loci were analysed and showed high genetic diversity in adults (HO 0.475“0.563 HE 0.551“0.649) and juveniles (HO 0.47“0.513 HE 0.576“0.685) in both populations. Results revealed differences of genetic diversity between two adult (Fst 0.123) and two juvenile populations (FST 0.188). However the differences were negligible and indicated that the fragmented habitat had negligible effect on genetic diversity. Gene flow or gene migration between two populations in adults or juveniles remained (Nm 1) although this value reduced slightly in the latter. Analysis of the mating system indicated high outcrossing rate of D. dyeri (tm 0.8). Biparental mating (tm “ ts) was relatively high (0.19“0.25) and suggested high tendency of mating system between relatives. Genetic conservation should derive from correlated outcrossing.

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Item Type:	Article
AGROVOC Term:	Dipterocarpus
AGROVOC Term:	Endangered species
AGROVOC Term:	Tropical forests
AGROVOC Term:	Lowland
AGROVOC Term:	Molecular biology
AGROVOC Term:	Polymerase chain reaction
AGROVOC Term:	DNA sequence
AGROVOC Term:	Microsatellites
AGROVOC Term:	Genetic diversity within species
AGROVOC Term:	Genetic variation
Depositing User:	Mr. AFANDI ABDUL MALEK
Last Modified:	24 Apr 2025 00:54
URI:	http://webagris.upm.edu.my/id/eprint/8187

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