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Scientia Silvae Sinicae ›› 2014, Vol. 50 ›› Issue (7): 37-43.doi: 10.11707/j.1001-7488.20140706

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Optimization of a SRAP-PCR System for Analysis of Genetic Diversity of Liriodendron

Zhao Yaqi1, Cheng Tielong2, Shi Jisen1, Wang Xinmin1, Xu Yang1, Liu Weidong1, Chen Jinhui1   

  1. 1. Key Laboratory of Forest Genetics and Biotechnology of Ministry of Education Nanjing Forestry University Nanjing 210037;
    2. Science and Technology Department, CAF Beijing 100091
  • Received:2013-07-29 Revised:2014-02-03 Online:2014-07-25 Published:2014-07-04
  • Contact: 陈金慧

Abstract:

The SRAP-PCR reaction system of Liriodendron was optimized with an orthogonal design to choose the most proper concentrations of Mg2+, dNTPs, primers, Taq polymerase and template DNA at four levels. The concentrations of Mg2+, Taq polymerase, template DNA were further fine-adjusted with a single-factor design. The optimized SRAP-PCR system (total 20 μL)was as follows: Mg2+3.0 mmol·L-1, dNTPs 0.3 mmol·L-1, primer 0.9 μmol·L-1, Taq polymerase 2.0 μmol·min-1 and DNA template 90 ng, 2 μL 10×PCR buffer and ddH2O. With the system, genetic diversity of 10 provenances of Liriodendron was analyzed. The results showed that, 182 loci were generated from the 15 screened primer pairs, of which 149 loci were polymorphic. The percent of polymorphic loci was 81.87%. The dendrogram of Liriodendron was constructed based on cluster analysis (UPGMA) with the Package of POPGEN 32.The genetic distance and relative relationship of the 10 provenances of Liriodendron was shown by the dendrogram distinctly. It indicated that SRAP molecular marker could be widely used in genetic diversity analysis of Liriodendron.

Key words: Liriodendron, SRAP, system optimization, genetic diversity

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