Recycling isolation of plant DNA, a novel method.

DNA is one of the most basic and essential genetic materials in the field of molecular biology. To date, isolation of sufficient and good-quality DNA is still a challenge for many plant species, though various DNA extraction methods have been published. In the present paper, a recycling DNA extraction method was proposed. The key step of this method was that a single plant tissue sample was recycled for DNA extraction for up to four times, and correspondingly four DNA precipitations (termed as the 1st, 2nd, 3rd and 4th DNA sample, respectively) were conducted. This recycling step was integrated into the conventional CTAB DNA extraction method to establish a recycling CTAB method. This modified CTAB method was tested in eight plant species, wheat, sorghum, barley, corn, rice, Brachypodium distachyon, Miscanthus sinensis and tung tree. The results showed that high-yield and good-quality DNA samples could be obtained by using this new method in all the eight plant species. The DNA samples were good templates for PCR amplification of both ISSR and SSR markers. The recycling method can be used in multiple plant species and can be integrated with multiple conventional DNA isolation methods, and thus is an effective and universal DNA isolation method.