A natural leaf color mutant gwgl in rice, named Baihuaidao 7, showed a typical phenotype of greenwhitegreen leaf at different stages. The mutant character only arose under signal stress induced by mechanical damage such as transplantation. The leaf color, chlorophyll a content and ultrastructure of chloroplast of the mutant were almost the same with the wild typle at the seedling stage. After the leaf changed white, total chlorophyll, chlorophyll a, chlorophyll b and carotenoid contents of the mutant were evidently decreased, the thylakoid of the mutant were gradually degraded, and the chloroplast grana lamella and grana were decreased. At maturity, the plant of the mutant was etiolated and dwarfed. The genetic analysis indicated that the leaf mutant was controlled by a recessive nuclear gene. Genetic mapping of the mutant gene was conducted by using the F2 mapping population of Baihuaidao 7/Jiangxi 1587. The results suggested that the mutant gene was mapped on rice chromosome 11 between InDel markers L59.27 and L64.811. The physical distances between the two InDel markers were about 740.5 kb. The mutant gene was considered to be a new leaf gene in rice and designated tentatively as GWGL，which laid a good foundation for finemapping, cloning and functional analysis of the mutant genes.
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