Genetic diversity in fragmented populations of Populus talassica inferred from microsatellites: implications for conservation.
Populus talassica Kom. is an ecologically important species endemic to central Asia. In China, its main distribution is restricted to the Ili region in the Xinjiang Autonomous Region. An understanding of genetic diversity and population structure is crucial for the development of a feasible conservation strategy. Twenty-six high-level simple sequence repeat (SSR) markers were screened and used to genotype 220 individuals from three native populations. A high level of genetic diversity and low population differentiation were revealed. We identified 163 alleles, with a mean of 6.269 alleles per locus. The observed and expected heterozygosities ranged from 0.472 to 0.485 (with a mean of 0.477), and from 0.548 to 0.591 (mean 0.569), respectively. Analysis of molecular variance revealed 93% variation within populations and 7% among populations. A model-based population structure analysis divided P. talassica into two groups (optimal K = 2). These genetic data provide crucial insight for conservation management.
National Engineering Laboratory for Tree Breeding, Key Laboratory of Genetics and Breeding in Forest Trees and Ornamental Plants, Ministry of Education, Beijing Laboratory of Urban and Rural Ecological Environment, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, China.|College of Forestry and Horticulture, Xinjiang Agricultural University, East Nongda Road, Urumqi, China.
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XH
Zhu
Pingdingshan University, Pingdingshan, Henan Province, China.
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SP
Cheng
National Engineering Laboratory for Tree Breeding, Key Laboratory of Genetics and Breeding in Forest Trees and Ornamental Plants, Ministry of Education, Beijing Laboratory of Urban and Rural Ecological Environment, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, China.
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T
Liao
National Engineering Laboratory for Tree Breeding, Key Laboratory of Genetics and Breeding in Forest Trees and Ornamental Plants, Ministry of Education, Beijing Laboratory of Urban and Rural Ecological Environment, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, China.
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XY
Kang
D000483:Alleles; D002681:China; D014644:Genetic Variation; D005828:Genetics, Population; D005838:Genotype; D018895:Microsatellite Repeats / Q000235:genetics*; D010802:Phylogeny; D032107:Populus / Q000235:genetics*