A simple and efficient genomic DNA extraction protocol for large scale genetic analyses of plant biological systems

Extraction of high quality genomic DNA from higher plants is hindered by the presence of secondary metabolites, which reduce the yield and quality of the DNA. We describe an alternative protocol for genomic DNA extraction from fresh and dry plant leaves that is amenable to PCR-based genetic analysis. Existing methods were either very lengthy, expensive or not suitable for extraction of genomic DNA from dry leaves. Our method used SDS and high salt concentrations to extract DNA and does not require use of hazardous materials or special laboratory equipment. Genomic DNA extracted using our method was used for PCR-based genetic characterization of different varieties of cashew trees, Anacardium occidentale, via SSR markers as well as Zea mays varieties. This protocol improves existing methods in that it has the advantage of being adaptable to studies with a large number of samples and limited resources. The method is rapid, cost efficient and uses non-hazardous reagents. Genomic DNA extracted using this method has sufficient quality for downstream PCR-based genetic analysis.