Population Genetic Diversity in The Genus Dryoblanops Gaertn. f. (Dipterocarpaceae) Based on Nucler Microsatellite Markers

Abstract

The genus Dryobalanops Gaertn. f. is a small but important genus that contains seven species and is found in the Southeast Asian tropical rain forests. Seven polymorphic nuclear microsatellite markers were analyzed in 46 natural populations of six extant Dryobalanops species (N = 700 individuals) covering the distribution range in Western Malesia. The mean gene diversity at the species level ranged from 0.392 in D. rappa to 0.635 in D. aromatica. The F ST value ranged from 0.156 in D. keithii to 0.283 in D. beccarii and all F ST values were highly significantly greater than zero. These results suggest that gene flow between populations has been limited and intensive genetic drift has occurred in all of the species. Plants with narrowly distributed species such as D. keithii and D. rappa, which are endemic to Borneo, tend to have lower levels of genetic diversity compared with widespread species such as D. aromatica. STRUCTURE analysis revealed that at least two of the six species could be effectively discriminated each other. The results of this study will be helpful for building effective conservation schemes as well as for providing basic data for future provenance trials of Dryobalanops species.

Genetic Variation and Genetic Structure of Two Closely Related Dipterocarp Species, Dryobalanops aromatica C.F. Gaertn. and D. beccarii Dyer

“…Only one isolated population is known outside of Borneo, in Panti Forest Reserve in Johor, Malaysia (Ashton, 1982). These two species are genetically closely related (Dwiyanti et al, 2015). The two species are recognised as morphologically and ecologically distinct, but identification is often difficult in the field, especially in the absence of flowers or fruits (Symington, 2004;Chua et al, 2010).…”

Population genetics and ecology of Sumatran camphor (Dryobalanops aromatica) in natural and community-owned forests in Indonesia

“…However, only a small population is being maintained because of commercial plantations, mainly oil palm plantations, offering greater economic opportunities for the local people. In addition, there is a lack of information on the genetic diversity and structure of the species in this area, which is a fundamental requirement for the development of appropriate conservation strategy and sustainable forestry management (Tsumura 2011;Dwiyanti et al 2015).…”