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With a conventional method of RNA extraction using an acid guanidinium thiocyanate-water-saturated phenol-chloroform mixture, extraction efficiency of extractable RNA to total RNA (extractable RNA+ residual RNA) in rice leaves at various ages was 54-69%. With a new method, an improvement of the above, using benzyl chloride instead of water-saturated phenol together with further maceration with a small amount of quartz sand, the efficiency was increased to 81-95%. When RNA fractions obtained with the improved method were subjected to agarose gel electrophoresis, intact bands of 25 S and 17 S rRNAs were detected. With a DNA probe for rice rbcS, only a single band was observed on the blotted membrane. These results indicate that the improved extraction method of RNA with benzyl chloride is useful for quantitative and qualitative analysis of RNA in plant tissues such as stiff leaves of rice.

An efficient method for extraction of RNA from rice leaves at different ages using benzyl chloride