Abstract
The ADH isoenzymes were investigated for seeds, seedlings and leaves of mature trees in a tropical tree species, Hopea odorata. The isoenzymes were dimeric and controlled by two loci;Adh 1 consisted of 3 alleles designated asAdh 1S, Adh 1N andAdh 1F, andAdh 2 was isoallelic. A differential gene expression of these loci was described. With use ofAdh 1 as a genetic marker outbreeding rate (t=0.634), interpopulational pollen flow rate (u =0.315) and selection coefficient for N/N genotype (s=0.486) were estimated in an experimental plantation consisting of two separate stands; S/S, S/N and N/N genotypes growing at Site I and S/S, S/F and F/F genotypes at Site II.
