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Acta Prataculturae Sinica ›› 2016, Vol. 25 ›› Issue (9): 96-103.DOI: 10.11686/cyxb2015547

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Genetic diversity of ten Vicia unijuga populations by ISSR markers

CHEN Hui1, YANG Hui2, QIANG Wei-Ya1,*   

  1. 1.State Key Laboratory of Grassland Agro-ecosystems, School of Life Sciences, Lanzhou University, Lanzhou 730000, China;
    2.Institute of Biology, Gansu Academy of Science, Lanzhou 730000, China
  • Received:2015-12-02 Online:2016-09-20 Published:2016-09-20

Abstract: Inter-simple sequence repeat (ISSR) markers were used to investigate the genetic diversity within and among ten natural populations of Vicia unijuga. Ten ISSR primers generated 115 discernible DNA bands, of which 110 (95.65%) were polymorphic. On average each primer produced 11.5 bands, including 11 polymorphic bands. At the species level, high genetic diversity was detected-PPB (percentage of polymorphic loci): 95.65%; Nm (gene flow): 0.4553; Gst (genetic differentiation coefficient): 0.5283; Hs (gene diversity in subdivided populations): 0.2632. However, relatively low genetic diversity existed within populations; the percentage of polymorphic loci rate ranged from 24.35% to 48.70%. A relatively high level of genetic differentiation among populations was revealed by Shannon’s information measure (0.4046) and analysis of molecular variance (AMOVA, 0.5051). The results showed that the ten populations of V. unijuga had high genetic diversity, but among the populations a certain degree of genetic differentiation had occurred: the genetic differentiation among populations was higher than within populations. The results suggest that environmental pressure has a selective relationship with genetic diversity. Low environmental pressure in Yantai and high environmental pressure in Hezuo regions were associated with high levels of genetic diversity, but in the medium pressure regions there was low genetic diversity. This study suggests an important relationship between V. unijuga genetic evolution and the environment and can also be used as a reference for working with genetic resources and breeding.