Polymorphic distribution and molecular diversification of mitochondrial plasmid-like DNAs in the genus Oryza.
Four kinds of circular plasmid-like DNA, designated B1, B2, B3 and B4, have been found in the mitochondria of rice (Oryza sativa L.). We analyzed the distribution of families of plasmid-like DNAs homologous to those of O. sativa in 40 strains of the genus Oryza with AA, BB, BBCC, CC, CCDD and EE genomes. Plasmid-like DNAs were observed only strains having AA, CC and CCDD genomes. The distribution patterns of strains with AA genome were highly polymorphic. We amplified the plasmid-like DNAs from strains with the AA genome by PCR and examined restriction fragments length polymorphisms (RFLPs). RFLPs were detected among families of plasmid-like DNA amplified from different strains. This result indicated that some mutations, such as base substitutions and the insertion or deletion of a small fragment of DNA, had occurred and had accumulated during the differentiation of strains with an AA genome.
Laboratory of Radiation Genetics, Faculty of Agriculture, University of Tokyo.
S
S
Miyata
A
A
Kanazawa
N
N
Tsutsumi
Y
Y
Sano
A
A
Hirai
D001483:Base Sequence; D015139:Blotting, Southern; D004272:DNA, Mitochondrial / Q000235:genetics*; D008969:Molecular Sequence Data; D012275:Oryza / Q000235:genetics*; D010957:Plasmids; D016133:Polymerase Chain Reaction; D012150:Polymorphism, Restriction Fragment Length; D013045:Species Specificity
D004272:DNA, Mitochondrial