Effect of Cytoplasmic Male Sterility on eui Gene Expression

Six allelic gene lines with Xieqingzao background were used as materials.By measuring the internode length of rice plants,determining GA1 levels in young panicles and flag leaves of rice,the effects of cytoplasmic male sterility on eui gene expression were studied.The results showed that wild abortive CMS gene significantly inhibited the elongation of the first internode in rice,causing CMS line XA to produce serious sheathed panicle.When eui1 and eui2 were transferred into CMS lines,bred XeA1 and XeA2 lines had GA1 contents 7.7 times and 1.5 times higher,respectively,than XA,compensating partly the deficit of GA1 level in CMS lines,inducing significant elongation of the first internode,thereby reducing or eliminating sheathed panicle of CMS lines.The eui1 CMS line showed more sensitivity to GA3 than eui and eui2 CMS lines.To a certain extent,eui gene expression compensated the negative effect of wild abortive CMS gene on uppermost internode elongation of rice.