以本氏针茅（Stipa bungeana）幼嫩叶片为材料，建立适合本氏针茅基因组I）NA提取的改良CTAB法，在此基础上采用正交试验设计和单因素分析相结合的方法，对本氏针茅SRAPPCR反应体系中的5个主要因素（DNA、Taq酶、dNTPs、Mg^2＋和引物）进行优化，旨在建立适合本氏针茅SRAP分析的反应体系。结果表明，在20pL总的反应体系中各组分的加入量分别为：DNA（20ng·μL^-1）3μL、TaqDNA酶（5U·μL^-1）0．2μL、dNTPs（2．5mmol·L^-1）1．4μL、引物（10μmol·L^-1）1．0μL、Mg^2＋（25mmol·L^-1）2．0μL、10×Buffer2．5μL ddH208．9μL。体系验证和引物筛选试验表明，该体系适于本氏针茅遗传多样性分析，该体系的建立可为本氏针茅种质资源遗传多样性研究和黄土高原植被恢复及生态建设提供理论基础。%An improved CTAB method, suitable for isolating genomic DNA of Stipa bungeana, using the young leaves of this grass speicies, was established in a previous study. Based on this result, an orthogo nal design and a factor analysis method were combined to optimize the SRAP-PCR reaction system of S. bungeana, including five main factors： DNA, Taq Polymerase, dNTPs, Mg2＋ and primers. The results indicated that the optimum concentrations of each component in the 20 μL reaction system were：DNA （20 ng·μL^-1 ）3 μL,Taq Polymerase （5 U·μL^-1） 0.2 μL, dNTPs（2.5 mmol· L^-1） 1.4 μL, prim-er（10 μmol.L^-1）1.0 μL, Mg2＋（25 mmol. L^-1） 2.0 μL, 10× Buffer 2. 5 μL, ddH208.9 μL. tion system has been experimentally validatied and primers selected, and should be a suitable the genetic diversity analysis of S. bungeana. This SRAP-PCR reaction system could provide the analysis of genetic diversity within S. bungeana germplasm resources, with applications be tion restoration and ecological reconstruction in the loess plateau. This reacsystem for a basis for ing vegetation restoration and ecological reconstruction in the loess plateau.
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