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A simple and rapid DNA extraction protocol capable of obtaining high-quality and quantity DNA from a large number of individuals is essential for assaying population and phylogenetic studies of plant pathogens. Most DNA extraction protocols used with oomycetes are relatively lengthy and cumbersome for high throughput analysis. Commercial kits are widely used, but low quantities of DNA are usually obtained, and with large scale analysis multiple isolations are required. A protocol for DNA isolation from Phytophthora and Pythium suitable for the evaluation of a large set of molecular markers was modified from one previously developed for soybean seed. There was a one to three fold increase in the amount of DNA that was extracted using the modified protocol compared to a commercial kit. The DNA obtained using the modified protocol was suitable for the amplification of microsatellite markers as well as the ITS region. This protocol is inexpensive, easy, quick, and efficient in terms of the volume of reagents and the number of steps involved in the procedure. The method may be applicable to other oomycetes and effectively implemented in other laboratories.

Easy and efficient protocol for oomycete DNA extraction suitable for population genetic analysis