目的建立并优化夏枯草ISSR-PCR反应体系和扩增程序,为探讨夏枯草种质间遗传多样性奠定基础。方法采用单因子试验和正交设计方法,研究Mg²⁺、dNTP、引物、TaqDNA聚合酶、模板DNA、退火温度及循环次数对PCR扩增的影响。结果夏枯草ISSR-PCR的最佳反应体系为:在20μL的反应体系中含模板DNA30ng,Mg²⁺2.2mmol/L、dNTP175μmol/L、引物0.75μmol/L、TaqDNA聚合酶1.0U。在此基础上,从92条引物中筛选出18条扩增稳定、多态性丰富的ISSR引物,并通过梯度PCR试验,确定引物最佳退火温度。结论采用单因子试验和正交设计方法可以快速建立ISSR-PCR反应体系,经过24份夏枯草种质检验,证明该体系稳定可靠,可用于夏枯草遗传分析。

Objective To establish and optimize the ISSR-PCR reaction system for Prunella vulgaris and lay foundation for its genetic diversity research.Methods The single-factor and orthogonal design were applied for optimizing seven factors in the ISSR-PCR reaction system including Mg²⁺,dNTP,primers,Taq DNA polymerase,the template DNA,annealing temperature,and cycles.Results The suitable PCR reaction system contained 2.2 mmol/L Mg²⁺,175 μmol/L dNTP,0.75 μmol/L primer,1.0 U Taq DNA polymerase,and 30 ng template DNA in total 20 μL reaction solution.On this basis,18 primers were screened with stable amplification and rich polymorphism from 92 ISSR primers.The optimal annealing temperature for ISSR-PCR reaction was proposed by gradient PCR.Conclusion It is a way to establisb the ISSR-PCR system for orthogonal design combining with single-factor test.And it is proved to be stable and credible for the result of 24 P.vulgaris. populations.This optimized ISSR reaction system would provide the basis for the genetic analysis of P.vulgaris.

国家自然科学基金资助项目(30772730)