Screening of Rice Germplasm Resources and Mapping QTLs for Traits Related with Potassium Deficiency Resistance at Seedling Stage
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1Rice Research Institute, Fujian Academy of Agricultural Sciences, Fuzhou, Fujian 350019;2State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops/Key Laboratory of Germplasm Innovation and Molecular Breeding of Hybrid Rice for South China, Ministry of Agriculture/Fuzhou Branch, National Rice Improvement Center/Incubator of National Key Laboratory of Germplasm Innovation and Molecular Breeding Between Fujian and Ministry of Sciences & Technology/Base of South-China, National Key Laboratory of Hybrid Rice/Fujian Engineering Laboratory of Crop Molecular Breeding/Fujian Key Laboratory of Rice Molecular Breeding/ National Engineering Laboratory of Rice, Fuzhou, Fujian 350003

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Fund Project:

National key research and development projects(2017YFD0100100); The provincial public welfare project of department of science and technology in Fujian provincial,China in 2016 (2016R1020-11)

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    Abstract:

    159 genetically-variable rice varieties were tested for low potassium tolerance according to the synthetic appraisal index. The results indicated that there were 18 and 10 rice varieties that were tolerant and sensitive to potassium deficiency, respectively. By deployment of the recombinant inbred lines (RILs) that were derived from the crossing between the varieties of Tainong67 (potassium tolerant) and Zhixi (potassium sensitive), 27 QTLs for potassium deficiency resistance were detected. The LOD values arranged from 2.52 to 9.23, which explained the phenotypic variance of 2.22% to 7.25%. A major QTL qKC-2 was mapped on chromosome 2 of rice. This locus was yet reported, and might encode for an unknown gene that is valuable for future fine mapping and gene isolation. The newly-developed indel markers could be used to rapidly screen the genotypes with potassium deficiency resistance, thus shortening the breeding period. The lines with good agronomic traits and potassium deficiency resistance could be chosen from RILs and applied to rice breeding directly.

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History
  • Received:January 21,2019
  • Revised:January 28,2019
  • Adopted:February 11,2019
  • Online: September 17,2019
  • Published:
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