一种用于PCR的番茄DNA快速粗提方法

Rapid Crude Extraction of Genomic DNA from Solanum lycopersicum for PCR

在对植物进行分子生物学研究时需要提取植物基因组DNA并对其进行PCR克隆,目前实验室常用CTAB法提取植物DNA,但其步骤相对繁琐,需要用有机溶剂反复抽提,在样本较多时,耗时较长。NaOH可以提取多种物种DNA,本研究优化了实验室条件下更加快速、经济、安全、高效的提取植物DNA的方式,主要包括以下步骤:利用液氮快速粉碎植物样品;采用碱裂解(0.5 mol/L NaOH)的方式一步提取DNA;提取的DNA利用TE缓冲液进行中和;以中和的粗提DNA作为模板进行PCR反应。本研究利用简单的DNA提取流程并结合PCR检测方式,完成了番茄转化子的快速初步鉴定。同时还证明了该NaOH法可用于番茄不同组织的DNA提取。本研究中整个操作过程步骤简单,耗时短,可在短时间内完成大量植物样品的DNA提取,无需使用氯仿、异丙醇等有毒物质,完成提取时间约为CTAB提取法的1/5,而且提取的不同组织DNA完整性较好,质量可观,满足常规的PCR检测,可用于基因克隆及转化子筛选鉴定,具有一定的利用价值和应用前景。

It is necessary to extract plant genomic DNA and perform PCR cloning when conducting the studies of molecular biology on plants.Currently,the CTAB(Cetyltrimethyl Ammonium Bromide)is commonly used to extract plant DNA in laboratories,but the steps are relatively cumbersome and require multiple organic solvents.Specifically,it takes a long time when there are many samples.The DNAs from multi-species were extracted by NaOH,and this study introduces a method of extracting plant genome DNA,which is faster,economical,safer and more efficient.The major steps include the followings:Quickly grinding the plant tissues using liquid nitrogen;quickly extracting DNA by alkaline lysis(0.5 mol/L NaOH);neutralizing the extracted DNA sample with TE buffer;and performing PCR with neutralized DNA as template.Using this simple DNA extraction method and combining PCR detection,the rapid preliminary identification of transgenic S.lycopersicum was completed.Furthermore,it was confirmed that this NaOH method could be used for extracting DNA from the different tissues of S.lycopersicum.The entire extraction process was simple and of short-time.Thereby,DNA extraction for a large number of plant samples could be completed in a short time without using toxic regents such as chloroform and isopropanol etc.The completion time of DNA extraction is about 1/5 of the time while using CTAB method.In addition,the extracted DNA from different tissues are of good integrity and high quality,which meet regular PCR detection,which can be used for gene cloning and for transgenic tomato screening.This method demonstrates potential utilization value and prospects.