文冠果ISSR反应体系的建立及优化

为了建立文冠果ISSR-PCR最佳反应体系，从而为文冠果遗传多样性研究提供理论依据，从定西巉口林场文冠果人工林内选取健康嫩叶为试验材料，通过单因子试验研究了影响ISSR-PCR反应各因素的浓度，分析因子包括模板DNA用量、退火温度、dNTP浓度、Mg2+浓度、引物浓度及TaqDNA聚合酶用量等。通过研究，找出了各因子合适的条件，建立并优化了文冠果ISSR反应体系，即20μL总反应体系含模板DNA约30 ng，Mg²⁺2.5 mmol/L，引物0.2μmol/L，dNTP 0.20 mmol/L，Taq聚合酶1 U。试验结果表明，在此反应体系下可得到多样性好、条带清晰的图谱。

Optimization of ISSR-PCR Amplification in Xanthoceras sorbifolia Bunge

The aims were to establish an optimal reaction system of ISSR-PCR in Xanthoceras sorbifolia Bunge,and provide theoretical basis for its genetic diversity research.From X.sorbifolia artificial forest in Chankou forest farm of Dingxi City,picking health and tender leaves as experiment material,the concentrations of main factors influencing the effects of ISSR-PCR were tested by single factor experiments respectively,the tested factors including template DNA concentration,annealing temperature,dNTP concentration,template DNA concentration,annealing temperature,Mg2 ＋concentration,primer concentration and Taq DNA polymerase.Through test,this study had found suitable conditions for each factor,established and optimized X.sorbifolia＇s reaction system of ISSR-PCR,namely the optimal reaction system for ISSR analysis in X.sorbifolia,included 30 ng template DNA,2.5 mmol/L Mg2 ＋,0.2 μmol/L primer,0.20 mmol/L dNTP and 1 U of Taq DNA polymerase in a total volume of 20 μL.The study indicated that atlas with fine diversity and clear strap was gained.