Allozyme variation of the endemic and vulnerable Dyera lowii Hook.f. in Central Kalimantan: Implications for genetic resources conservation

Abstract

Dyera lowii is an endemic and vulnerable tree species of commercial value as chewing gum found in peat swamp forests, scatteredly distributed in Sumatra, Kalimantan, and Peninsular Malaysia. Their existence is now under severe threat due to habitat conversion. This study is aimed to assess genetic diversity within four natural populations (Hampangen, Parahangan, Sebangau, Selat Nusa ) and one plantation in Central Kalimantan based on allozyme variation. Electrophoresis procedures were conducted with an isoelectric focusing polyacrylamide slab gel system. The result showed high genetic diversity (HE=0.52) and gene fl ow (3.402) seemed to be effective. A total of 14 alleles were found among all the analysed population. Mean number of alleles per locus (Aa) was 3.206, and the effective number of alleles per locus (Ae) was 2.21. Genetic differentiation between populations (FST) was signifi cant at the moderately level (0.0685). Most allozyme variation was found within population (93.2%). Special attention is essential to conserve a private allele of Got-1-e (9%) at Selat Nusa population. Sebangau population missed the alleles of Est-2-b and Got-1-a, as found in other populations. Selat Nusa population is expected to enhance the effective management for genetic resources conservation of this vulnerable species in the future.

Keywords

• allozyme
• genetic diversity
• genetic differentiation
• populations
• Dyera lowii