Abstract: 【Objective】 The objective of this study is to analyze the morphological structure, chlorophyll components, chloroplast ultrastruture and map genes underlying the two novel leaf color mutants in rice. 【Method】 A white stripe leaf mutant and a yellow leaf mutant were found in rice breeding materials. The main agronomic character and chloroplast ultrastructure of the mutants were observed. The mutant genes was mapped with SSR markers and F2 mapping population of the cross between the two mutant lines. 【Result】 Compared to their wild-type, the panicles per plant of the white stripe leaf mutant decreased by 12.86%, and the growth duration increased by 11.27%; the plant height of yellow leaf mutant decreased by 31.08% and the growth duration increased by 17.86%, and the photosynthetic pigment contents of both mutants were significantly lower than their wild-type. The result of electron microscope observation showed that the grana structures were unnormal in both mutants. The genetic analysis indicated that the white stripe leaf mutant was controlled by a recessive nuclear gene located on the tip of the short arm of rice chromosome, 9.6 cM from marker RM1331, named st9(t)(stripe) here, and the yellow leaf mutant was controlled by another recessive nuclear gene, mapped on the short arm of rice chromosome 3, within the interval between markers RM411 (1.2 cM) and RM8202 (5.1 cM) named chl12(t) (Chlorophyll-deficit). 【Conclusion】 The two novel mutant genes were mapped, which laid a good foundation for fine mapping, cloning and functional analysis of the mutant genes.

Key words: rice, white stripe-leaf mutant, yellow-leaf mutant, genetic analysis, mapping