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Citation:

Genetic Diversity of Populus laurifolia and Populus nigra Along Erqis River

  • Received Date: 2013-11-28
  • The genetic diversity and population genetic differentiation of Populus laurifolia and P.nigra distributed along Erqis River were studied by using nuclear microsatellite markers (SSR). The results showed that the P. laurifolia and P. nigra populations had an abundant genetic diversity, especially P. laurifolia. Higher gene flow (Nm=10.0585) was found in P.nigra than in P.laurifolia, which prevented the genetic differentiation among populations. It was found that 97.57% genetic variation resulted from intra-populations. In addition, there existed a higher heterozygosity in P. laurifolia and P. nigra populations, and many genetic coefficients of populations were smaller than those of species. The inbreeding coefficients among populations were negative, indicating that all SSR loci investigated were deviated from Hardy-Weinberg equilibrium at the level of individuals and populations, which suggested that excess of heterozygotes was present in the population.
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Genetic Diversity of Populus laurifolia and Populus nigra Along Erqis River

  • 1. State Key Laboratory of Tree Genetics and Breeding, Key Laboratory of Tree Breeding and Cultivation, State Forestry Administration, Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, China
  • 2. Research Institute of Resources Insects, Chinese Academy of Forestry, Kunming 650224, Yunnan, China
  • 3. Altai Research Institute of Forestry, Altai 836500, Xinjiang, China
  • 4. Habahe County Forestry Bureau, Habahe 836700, Xinjiang, China

Abstract: The genetic diversity and population genetic differentiation of Populus laurifolia and P.nigra distributed along Erqis River were studied by using nuclear microsatellite markers (SSR). The results showed that the P. laurifolia and P. nigra populations had an abundant genetic diversity, especially P. laurifolia. Higher gene flow (Nm=10.0585) was found in P.nigra than in P.laurifolia, which prevented the genetic differentiation among populations. It was found that 97.57% genetic variation resulted from intra-populations. In addition, there existed a higher heterozygosity in P. laurifolia and P. nigra populations, and many genetic coefficients of populations were smaller than those of species. The inbreeding coefficients among populations were negative, indicating that all SSR loci investigated were deviated from Hardy-Weinberg equilibrium at the level of individuals and populations, which suggested that excess of heterozygotes was present in the population.

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