Comparison of the fine-scale genetic structure of three dipterocarp species

Abstract

We investigated the fine-scale genetic structure of three tropical-rainforest trees, Hopea dryobalanoides, Shorea parvifolia and S. acuminata (Dipterocarpaceae), in Peninsular Malaysia, all of which cooccurred within a 6-ha plot in Pasoh Forest Reserve. A significant genetic structure was found in H. dryobalanoides, weaker (but still significant) genetic structure in S. parvifolia and nonsignificant structure in S. acuminata. Seeds of all three species are wind dispersed, and their flowers are thought to be insect pollinated. The most obvious difference among these species is their height: S. parvifolia and S. acuminata are canopy species, whereas H. dryobalanoides is a subcanopy species. Clear differences were also found among these species in their range of seed dispersal, which depends on the height of the release point; so taller trees disperse their seed more extensively. The estimates of seed dispersal area were consistent with the degree of genetic structure found in the three species. Therefore, tree height probably had a strong influence on the fine-scale genetic structure of the three species.

Genetic structure of the threatened Dipterocarpus costatus populations in lowland tropical rainforests of southern Vietnam

“…The high values of pairwise F ST (0.405) showed strong differentiation among the D. costatus populations. Due to large geographical distances between the populations (>50 km), the limited gene flow via pollen (pollination by insects within a distance of 200 m; Appanah and Chan, 1981;Fukue et al, 2007) and seed dispersal by wind or gravity (the dispersal distances of up to 500 m; Chan, 1980;Takeuchi et al, 2004). The analysis also revealed the low levels of migration among the studied populations (N m = 0.37).…”

“…Various molecular markers have been identified as efficient tools for studying genetic structure, gene flow, and mating systems, and estimating genetic variation within a species. Especially, microsatellite markers are useful in analyzing the effective pollen flow and seed dispersal among populations and within a species (Ujino et al, 1998;Iwata et al, 2000;Takeuchi et al, 2004;Pandey and Geburek, 2009;Tam et al, 2014;Trang et al, 2014). The objective of this study was to use simple sequence repeats (SSRs) as genetic markers to investigate the level of genetic variability within and among the populations of D. costatus and to provide guidelines for the conservation, management, and restoration of this species to the Forest Protection Department, Vietnam.…”

Genetic variation in and spatial structure of natural populations of Dipterocarpus alatus (Dipterocarpaceae) determined using single sequence repeat markers

“…Microsatellite markers (single sequence repeat, SSRs) are useful to analyze the effective pollen flow and seed dispersal within populations. Thus, these markers (high polymorphics) have been used for studies on gene flow, genetic structure, and mating systems (Ujino et al, 1998;Iwata et al, 2000;Takeuchi et al, 2004;Pandey and Geburek, 2009).…”

Genetic diversity of Dipterocarpus dyeri in the tropical forests of Tan Phu (Dong Nai)

“…Kỹ thuật Microsatellite là một trong những công cụ được sử dụng trong việc đánh giá các mô hình đa dạng di truyền ở thực vật và kỹ thuật này có tiềm năng, lợi thế trong điều tra các loài cây quý hiếm. Trên thế giới, kỹ thuật Microsatellites (SSR) được ứng dụng phổ biến cho các nghiên cứu về đa dạng di truyền đối với một số loài cây họ Dầu [4,9,13,15].…”