魔芋DNA快速提取新方法及ISSR-PCR扩增（摘要）

目的]研究魔芋DNA的提取方法。方法]采用CTAB、SDS及新改良的方法提取魔芋总DNA,通过分光光度计检测、电泳检测及ISSR-PCR检测方法进行比较分析。结果]采用新改良的方法得到的DNA纯度及产量均较高,适于魔芋DNA的快速提取;以其为模板进行ISSR-PCR扩增,条带清晰,可获得较好的结果。新改良的方法与常规的SDS及CTAB方法相比,有以下优点：①效率高。运用冷冻研磨仪进行研磨,克服了研磨困难问题,节约液氮,且研磨效率大大提高,研磨时间短,褐变较少,1个人即可同时大批量进行提取;②提取质量高。在提取液中加入高浓度的PVP、β-巯基乙醇及KAc,有效去除了多酚和多糖等次生物质,检测结果DNA条带清晰,且无拖尾,更有利于大规模样本DNA提取;③用材少。需要的魔芋组织量少,适宜对较为珍贵的材料进行DNA提取,从而进行分子标记辅助育种、群体遗传多样性分析和种芋纯度鉴定的研究。结论]为大规模提取高质量的魔芋DNA奠定基础,也为进一步研究魔芋的遗传多样性提供了分子依据。

Rapid DNA Extraction Method from Amorphophallas. konjac and ISSR-PCR Amplification

Objective]The research aimed to study the total DNA extraction methods of Amorphophallas.konjac.Method]To investigate the optimum DNA extraction method,CTAB,SDS and new modified methods for isolating genomic DNA from Amorphophallas.konjac leaf were studied and the isolated DNAs were examined by ultraviolet absorption test,agarose gel electrophoresis and ISSR-PCR test for comparative analysis.Result]The results showed that the new modified method was suitable for DNA isolation from Amorphophallas.konjac plants with high purity and yield;quality of DNA could meet ISSR-PCR requirement even extracted once by the new modified method.Conclusion]The study provided basis for extracting high quality DNA sample,and offered the molecular genetics reference for exploring the genetic diversity of Amorphophallas.konjac.