Abstract
Rice cultivars vary widely in their UVB sensitivity and this has depended on CPD photolyase mutations. It is well known that wild rice species have a high degree of genetic variation, making them important reservoirs of potentially useful genes. In order to search useful gene of CPD photolyase with higher activity, we investigated the UVB-sensitivity in two cultivated species (O. sativa and O. glaberrima) and three wild rice species with AA genome (O. barthii, O. meridionalis and O. rufipogon) focusing on the CPD photolyase activity and genotype of CPD photolyase. As a result, although the UVB sensitivity, the CPD photolyase activity and genotype of the CPD photolyase varied widely among these rice species, the sensitivity to UVB radiation depends on the activity of CPD photolyase. The CPD photolyase activity greatly depends on amino acid residue at position of 126 and 296.
