A Method Suitable for Extracting Genomic DNA from Animal and Plant——Modified CTAB Method

[Objective] The study aimed to introduce a rapid and effective method that is suitable for extracting genomic DNA from animal and plant. [ Method ] The genomic DNAs were extracted from tender leaves of 24 peanut cuhivars and from the liver, lung and kidney of white mouse through the specifically modified CTAB method. The DNAs were run on agarose gel, next detected by DNA/Protein analyzer. Finally PCR amplification was conducted to detect the quality of DNAs extracted using the modified CTAB method. [ Result] The clear and orderly bands were observed in gel detection, and the values of OD200/OD200 for DNAs extracted via modified CTAB method were between 1.77 - 1.83. The DNAs performed well in PCR amplification. [ Conclusion] The DNAs extracted by modified CTAB method could satisfy the requirement of PCR amplification.

Modified CTAB Method for Extracting Genomic DNA from Wheat Leaf

ObjectiveThe aim was to seek for a rapid DNA minipreparation method from wheat leaf. MethodThe total DNA of wheat leaf was extracted using CTAB, SDS and boiling water, separately, with some modifications. Integrity and purity of nucleic acids were detected through agarose gel electrophoresis, ultraviolet absorption and PCR. ResultThe DNA extracted by the modified CTAB method had high quality and purity, and was not degraded. Two hundreds of DNA samples could be extracted each workday by per capita using this method; and the PCR detection of wheat transgenic plants showed that amplified bands of target gene were clear, without false-positive, and the test results were satisfactory. The DNA purity and concentration extracted by modified SDS method were not as good as that extracted by modified CTAB method, but it also met the DNA requirements of major molecular research. The DNA quantity extracted by modified boiling method was small and there were a lot of impurities in it, PCR detection of this DNA showed no amplified band. ConclusionModified CTAB method is a simple and rapid method for DNA minipreparation from wheat leaf, and was suitable for PCR amplification and other molecular biology researches.

A Comparative Study on Extraction Methods of Total RNA from Leaves of Acer truncatum ‘Luhong No.1’

Leaves of Acer truncatum ＇ Luhong No. 1 ＇ contain large amounts of polysaccharides and polyphenols, which seriously affect extraction yield and quality of total RNA. In order to explore the appropriate total RNA extraction method, total RNA was extracted from leaves of A. truncatum ＇ Luhong No. 1 ＇ with three methods, including kit method, Trizol method and modified CTAB method. The results showed that ODE6o/OD2so and OD^o/OD2ao ratios of total RNA extracted from leaves of A. truncatum ＇ Luhong No. 1 ＇ with kit method were higher than 1.8, with a general yield and certain level of DNA contamination ; OD^o/OD~ and OD^o/OD^o ratios of total RNA extracted with Trizol method were about 1.5, with the lowest yield; OD260/OD280 and OD260/OD230 ratios of total RNA extracted with modified CTAB method were about 2.0, with the highest yield and distinct eleetrophoresis patterns. The results demonstrated that total RNA extracted with modified CTAB method exhibited high yield and purity, which could meet the demands of subsequent molecular biology research. Thus, modified CTAB method is the appro- oriate method for extracting total RNA from leaves of A. truncatum ＇ Luhong No. 1 ＇