Abstract
Rice cultivars (Oryza sativa L.) vary widely in their sensitivity to UVB. We found that the cyclobutane pyrimidine dimer (CPD) photorepair activities in UVB-sensitive cultivars were lower than these in UVB-resistant cultivars in several rice cultivars and a possibility that these. These differences in the photorepair activities maight correlate with the differences in the deduced amino acid sequences of CPD photolyase. Wild rices are thought to be progenitors of rice cultivars, and to have many variations in CPD photolyase genes. In this study, we investigated the variations in UVB-sensitivities,deduced amino acid sequences of CPD photolyases and the activities of CPD photolyases in several wild rice plants (O.rufipogon, O.meridionalis) originated from various geography, Asia and Australia. We found that there were variations in deduced amino acid sequences of CPD photolyases in wild rices having different UVB-sensitivities. [J Radiat Res 44:416 (2003)]
