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

Tâm, Nguyễn Minh; Duy, Vu Dinh; Đức, Nguyễn Minh; Giap, V.D.; Xuan, Bui Thi Tuyet

doi:10.4238/2014.july.24.17

Cited by 19 publications

(16 citation statements)

References 11 publications

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“…It is widely distributed in evergreen and dry deciduous forests on ancient alluvial, granite, and basalt rocks with low relief and gentle slopes, in areas where water levels rise and fall rapidly during both the dry and rainy seasons. Optimal conditions for the species include humidity of 75-85%, precipitation of 1500-2200 mm, mean annual temperatures of 25-27 C, and a dry season lasting 4-6 months (Tam et al 2014; The Forest Herbarium 2017).…”

Section: Introductionmentioning

confidence: 99%

Modeling habitat suitability of Dipterocarpus alatus (Dipterocarpaceae) using MaxEnt along the Chao Phraya River in Central Thailand

Kamyo

Asanok

2019

Forest Science and Technology

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Dipterocarpus alatus plays a dominant role in the ecology and economics of riparian forests in Thailand. Using MaxEnt modeling, we identified potentially suitable regions for D. alatus along the Chao Phraya River in central Thailand. The modeling procedure used 465 occurrence records and 19 Worldclim environmental factors as well as aspect, slope and elevation data. The results indicated that precipitation is the key influential factor affecting the distribution of D. alatus. Highly suitable regions for this species included Nakhon Sawan, Uthai Thani, Loburi, Phra Nakhon Si Ayudhya, and Ang Thong Provinces along the Chao Phraya River. The statistically significant area under the receiver operating characteristics curve value (0.904) indicated that MaxEnt can be used to accurately predict suitable regions for growing commercially valuable plants such as D. alatus. These model results can facilitate habitat conservation and sustainable resource utilization of rare and important plants.

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Section: Introductionmentioning

confidence: 99%

Modeling habitat suitability of Dipterocarpus alatus (Dipterocarpaceae) using MaxEnt along the Chao Phraya River in Central Thailand

Kamyo

Asanok

2019

Forest Science and Technology

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“…The STRUCTURE results suggest distinct differentiation among D. costatus populations due to habitat fragmentation and isolation. Tam et al, 2014). Therefore, the low genetic diversities might be a consequence of allelic loss within the populations of D. costatus.…”

Section: Population Structurementioning

confidence: 99%

“…This level of genetic variation was considered high when compared to Shorea species in Indonesia with a 43% genetic variation within populations (Cao et al, 2009), and low when compared to D. alatus in Vietnam with a genetic variation of 74.9% within populations and the genetic differentiation of 0.266 (Tam et al, 2014). The high values of pairwise F ST (0.405) showed strong differentiation among the D. costatus populations.…”

Section: Population Structurementioning

confidence: 99%

“…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.…”

Section: Introductionmentioning

confidence: 99%

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

Đức

Duy²,

Xuan

et al. 2016

Genet. Mol. Res.

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ABSTRACT. Dipterocarpus costatus is an endangered species restricted to the lowland forests of southern Vietnam. Habitat loss and over-exploitation of D. costatus wood are the major threats to this species. We investigated the level of genetic variability within and among populations of D. costatus in order to provide guidelines for the conservation, management, and restoration of this species to the Forest Protection Department, Vietnam. respectively, in the lowland forests of southeast Vietnam. The low genetic diversity might be a consequence of inbreeding within the small and isolated populations of D. costatus owing to its habitat loss and over-exploitation. All populations deviated from Hardy-Weinberg equilibrium showing reduced heterozygosity. Alleles were lost from the populations by genetic drift. Genetic differentiation among populations was high (average pairwise F ST = 0.405), indicating low gene flow (<1) and isolated populations due to its destructed habitat and large geographical distances (P < 0.05) among populations. Heterozygosity excess tests (except of Bu Gia Map only under infinite allele model) were negative. The high genetic variation (62.7%) was found within populations. The STRUCTURE and neighbor joining tree results suggest strong differentiation among D. costatus populations, with the three genetic clusters, Phu Quoc, Tan Phu and Bu Gia Map, and Lo Go-Xa Mat due to habitat fragmentation and isolation. The threatened status of D. costatus was related to a lack of genetic diversity, with all its populations isolated in small forest patches. We recommend the establishment of an ex situ conservation site for D. costatus with a new big population comprising all genetic groups in order to enhance its survival under different environmental stresses.

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“…Molecular markers such as random amplified polymorphic DNA (RAPD), amplified fragment length polymorphism (AFLP), simple sequence repeat (SSR) and inter-simple sequence repeat (ISSR) are frequently used for evaluating the genetic variation of plants (Baye 2012;Karp et al 2012;Frascaroli et al 2013;Tam et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Genetic diversity of Castanea sativa an endangered species in the Hyrcanian forest

Janfaza¹,

Yousefzadeh²,

Nasr³

et al. 2017

Silva Fenn.

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Highlights• This is the first report of genetic diversity of the few remaining populations of C. sativa in the southern limits of its distribution in Eurasia.• Low genetic diversity and high genetic differentiation among small isolated populations of C. sativa with low geographical distance represent serious genetic erosion indicators in the Hyrcanian forest, even hinting at an ongoing extinction vortex. AbstractCastanea sativa Mill. is one of the most endangered tree species in Iran where it is represented by small fragmented populations in the north of the country. 18 simple sequence repeat (SSR) loci (10 nuclear and 8 chloroplastic) were used to evaluate the genetic diversity and population structure of C. sativa from the Hyrcanian forest. For nuclear SSR, the number of alleles detected per locus ranged from 1 to 5 and observed heterozygosity (H O ) was between 0.125 and 1.000. Analysis of molecular variance (AMOVA) indicated a high level of variation within populations (84%) and low levels between populations (16%). Based on structure analysis, the four studied populations were divided into two main clusters that have genetic distance F st = 0.3. The Shafaroud population was separated in the first cluster, Siyahmazgi, Qalehroudkhan and Veysroud were placed in the second cluster. The UPGMA analysis confirmed the results of Structure analysis, separating the Shafaroud population from the others. The 8 chloroplast SSR loci used to screen the populations showed no polymorphism. In General, low nuclear genetic diversity, no polymorphism in cpDNA and considerable genetic differentiation among populations in short geographical distance represent a serious genetic erosion threat for C. sativa in the Hyrcanian forest, even hinting at an ongoing extinction vortex. Therefore, due to significant decline in genetic diversity, it is essential to introduce constraints protection upon the areas of distribution of all four populations of this species in Iran.

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

Cited by 19 publications

References 11 publications

Modeling habitat suitability of Dipterocarpus alatus (Dipterocarpaceae) using MaxEnt along the Chao Phraya River in Central Thailand

Modeling habitat suitability of Dipterocarpus alatus (Dipterocarpaceae) using MaxEnt along the Chao Phraya River in Central Thailand

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

Genetic diversity of Castanea sativa an endangered species in the Hyrcanian forest

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