Isolation of Chloroplast and Plasmid DNA

cpDNA was prepared as described previously［9］.Plasmid DNAs were isolated and purified by cesium chloride centrifugation.The designations of the cloned plasmids used for probing transcripts of plastid and nuclear genes of maize are listed in Table 1 together with the sizes of the cloned inserts and the genes encoded.(https://www.daowen.com)