Characterization and mapping of novel chlorophyll deficient mutant genes in durum wheat

文献类型： 外文期刊

第一作者： Li, Ning

作者： Li, Ning;Jia, Jizeng;Xia, Chuan;Liu, Xu;Kong, Xiuying

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关键词： durum wheat;yellow-green leaf mutant;genetic mapping;agronomic traits

期刊名称：BREEDING SCIENCE （ 影响因子：2.086； 五年影响因子：2.632 ）

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收录情况： SCI

摘要： The yellow-green leaf mutant has a non-lethal chlorophyll-deficient mutation that can be exploited in photosynthesis and plant development research. A novel yellow-green mutant derived from Triticum durum var. Cappelli displays a yellow-green leaf color from the seedling stage to the mature stage. Examination of the mutant chloroplasts with transmission electron microscopy revealed that the shape of chloroplast changed, grana stacks in the stroma were highly variable in size and disorganized. The pigment content, including chlorophyll a, chlorophyll b, total chlorophyll and carotene, was decreased in the mutant. In contrast, the chla/chl6 ratio of the mutants was increased in comparison with the normal green leaves. We also found a reduction in thephotosynthetic rate, fluorescence kinetic parameters and yield-related agronomic traits of the mutant. A genetic analysis revealed that two nuclear recessive genes controlled the expression of this trait. The genes were designated ygldl and ygld2. Two molecular markers co-segregated with these genes, ygld 1 co-segregated with the SSR marker wmcllO on chromosome 5AL and ygld 2 co-segregated with the SSR marker wmc28 on chromosome 5BL. These results will contribute to the gene cloning and the understanding of the mechanisms underlying chlorophyll metabolism and chloroplast development in wheat.

分类号： S33

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