Characterization and fine mapping of thermo-sensitive chlorophyll deficit mutant1 in rice (Oryza sativa L.)

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  • Liu Jin
    Key Laboratory of Crop Physiology, Ecology, Genetics and Breeding, Ministry of Agriculture, Shenyang Agricultural University
  • Wang Jiayu
    Key Laboratory of Crop Physiology, Ecology, Genetics and Breeding, Ministry of Agriculture, Shenyang Agricultural University
  • Yao Xiaoyun
    Key Laboratory of Crop Physiology, Ecology, Genetics and Breeding, Ministry of Agriculture, Shenyang Agricultural University
  • Zhang Yu
    Key Laboratory of Crop Physiology, Ecology, Genetics and Breeding, Ministry of Agriculture, Shenyang Agricultural University
  • Li Jinquan
    Max Planck Institute for Plant Breeding Research
  • Wang Xiaoxue
    Key Laboratory of Crop Physiology, Ecology, Genetics and Breeding, Ministry of Agriculture, Shenyang Agricultural University
  • Xu Zhengjin
    Key Laboratory of Crop Physiology, Ecology, Genetics and Breeding, Ministry of Agriculture, Shenyang Agricultural University
  • Chen Wenfu
    Key Laboratory of Crop Physiology, Ecology, Genetics and Breeding, Ministry of Agriculture, Shenyang Agricultural University

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  • Characterization and fine mapping of thermo-sensitive chlorophyll deficit mutant1 in rice (<i>Oryza sativa</i> L.)

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Chlorophyll content is one of the most important traits controlling crop biomass and economic yield in rice. Here, we isolated a spontaneous rice mutant named thermo-sensitive chlorophyll deficit 1 (tscd1) derived from a backcross recombinant inbred line population. tscd1 plants grown normally from the seedling to tiller stages showed yellow leaves with reduced chlorophyll content, but showed no significant differences after the booting stage. At temperatures below 22°C, the tscd1 mutant showed the most obvious yellowish phenotype. With increasing temperature, the yellowish leaves gradually turned green and approached a normal wild type color. Wild type and tscd1 mutant plants had obviously different chloroplast structures and photosynthetic pigment precursor contents, which resulted in underdevelopment of chloroplasts and a yellowish phenotype in tscd1. Genetic analysis indicated that the mutant character was controlled by a recessive nuclear gene. Through map-based cloning, we located the tscd1 gene in a 34.95 kb region on the long arm of chromosome 2, containing two BAC clones and eight predicted candidate genes. Further characterization of the tscd1 gene is underway. Because it has a chlorophyll deficit phenotype before the tiller stage and little influence on growth vigor, it may play a role in ensuring the purity of hybrids.

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