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Cuticular wax forms a hydrophobic barrier on aerial plant organs; it plays an important role in protectinga plant from damage caused by many forms of environmental stress.In the present study,we characterized a rice leafwax-deficient mutant osgl1-1 derived from a spontaneous mutation,which exhibited a wax-deficient and highly hydrophilic leaf phenotype.We cloned the OsGL1-1 gene by the map-based cloning method and performed a complementation test to confirm the function of the candidate gene.Molecular studies revealed that OsGL1-1 was a member of the OsGL1family,and contained regions that were homologous to some regions in sterol desaturases and short-chain dehydrogenases/reductases.Compared to the wild-type,the osgl1-1 mutant showed decreased cuticular wax deposition,thinner cuticular membrane,decreased chlorophyll leaching,increased rate of water loss,and enhanced sensitivity to drought.OsGL1-1 is expressed ubiquitously in rice.The transient expression of OsGL1-1-green fluorescent protein fusion protein indicated that OsGL1-1 is localized in the cytoplasm,plasma membrane,and nucleus.