以陕西产野生石蒜〔Lycoris radiata (L’Hr.)Herb.〕为材料,通过单因子实验分别研究了模板DNA、Mg²⁺、dNTPs、引物浓度及Taq DNA聚合酶用量对石蒜SRAP分子标记扩增体系的影响,并对扩增体系进行了优化。优化后的反应体系总体积为10μL,含20ng模板DNA、3.0mmol·L^-1Mg²⁺、0.20mmol·L^-1dNTPs、0.4μmol·L^-1引物和0.50UTaq DNA聚合酶。运用优化体系对9个石蒜居群的基因组DNA进行扩增,获得的DNA条带清晰,多态性比较丰富。说明SRAP-PCR可用于石蒜属植物的亲缘关系、系统演化、物种鉴别和遗传多样性等领域的研究。 

Effects of concentrations of template DNA, Mg²⁺, dNTPs, primers and amount of TaqDNA polymerase on SRAP molecular marker amplification system of Lycoris radiata(L' Hér.)Herb. from Shaanxi Province were studied by monofactorial experiment, and amplification system was optimized, too. Total volume of optimal system is 10μL,  which contains 20ng template DNA, 3.0 mmol·L^{- 1} Mg²⁺,0.20mmol· L^{- 1}dNTPs, 0.4μmol· L^{- 1}primerand 0.50U TaqDNA polymerase. By using this optimal system, genomic DNA of nine populations of L. radiate was amplified, and DNA bands were clear and had high polymorphism. It is concluded that SRAP-PCR can be used to research genetic relationship, systematic evolution, species identification and genetic diversity of  Lycoris Herb. species.