水稻PCR反应体系的正交设计优化及验证(英文)

[目的]筛选经济、稳定性好的水稻PCR反应体系,并检测所选体系在不同的基于PCR反应的分子标记中的通用性。[方法]以CTAB法提取的水稻叶片DNA为模板,应用L16(45)正交设计进行PCR反应体系优化。选用20μl体系的浓度梯度设计,对DNA模板浓度、dNTP、引物浓度、Taq酶、Mg2+浓度5个因素设计4个水平。先以1个SSR标记(MRG6102)对16个不同体系进行筛选。为了验证所选最优体系的稳定性,再选用6个SSR标记(RM213、RM207、RM208、RM155、OSM89、OSM91)对20个水稻品种(系)进行扩增;为检测除SSR标记以外的基于PCR反应标记的通用性,选用2个STS标记(OSR20、OSR32)及2个显性标记(Pibdom,Lys145)进行检测。[结果]16个不同处理组合均扩增出了清晰谱带,但扩增效果及PCR产量有差异。最经济、适用的体系为:20μl反应体系,20ng模板DNA,浓度150μmol/LdNTP,浓度0.2μmol/L引物,1.0UTaqDNA聚合酶,浓度1.5mmol/LMg2+,1×Taqbuffer,剩余体积用超纯水补齐。PCR扩增程序为:95℃预变性3min;94℃变性45s,48～55℃退火45s(不同的引物其最佳退火温度不同),72℃延伸1min(对于其他一些基于PCR反应的标记,如果预期片段较大,可以适当调整延伸时间到1.5min),共36个循环;72℃延伸7min;然后4℃保存。[结论]该研究确定了水稻PCR优化反应体系,该体系也适用于一些其他基于PCR反应的标记。

Optimization and Testing for PCR System of Rice by Orthogonal Design

[Objective] This study was to screen the economic or stable PCR system of rice and detect the generality of the selected system in different molecular markers based on PCR.[Method] With DNA extracted from rice leaves by CTAB method as the template,PCR system was optimized by L16(45)orthogonal design.[Result] Clear bands were amplified from 16 different combinations,but the amplification effects and yields had difference.The most economic and applicable system was as follows:20 ng DNA template,150 μmol/L dNT...