Research Progress on Extraction and Application of Genomic DNA from Plants and Food Sources

In recent years, with the rapid development of molecular genetic technology, the extraction of genomic DNA is one of the most basic techniques, and DNA-based gene analysis is widely used in genome sequencing, mutant analysis, transgenic lines, quality identification, fingerprinting and other studies.This paper reviewed the methods of genomic DNA extraction from plants and foods in the past 20 years, and analyzed the improvement or difference of various methods such as CTAB method, and the mixed test of two or more methods, and described the content of improvement and the results obtained.The main tissue parts such as leaf, stem segment, seed and root were described.The species and application of genomic DNA of agricultural crops（cash crops）,medicinal plants, endangered plants and food source materials were analyzed.Finally, we prospected the further research and application of genomic DNA extraction methods.