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    • Keywords


      rice; salinity tolerance; reproductive stage; quantitative trait loci; grain yield.

    • Abstract


      Salinity tolerance in rice is critical at reproductive stage because it ultimately determines grain yield. An F2 mapping population derived from a Sadri/FL478 cross was exposed to saline field conditions (6–8 dS m-1) after the active tillering stage to identify reproductive stage specific QTLs for salinity tolerance. Genetic linkage map was constructed using 123 microsatellite markers on 232 F2 progenies. Totally 35 QTLs for 11 traits under salinity stress were detected with LOD >3, out of which 28 QTLs that explained from 5.9 to 30.0% phenotypic variation were found to be significant based on permutation test. Three major QTL clusters were found on chromosomes 2 (RM423–RM174), 4 (RM551–RM518) and 6 (RM20224–RM528) for multiple traits under salinity stress. Both parental lines contributed additively for QTLs identified for the yield components. A majority of the QTLs detected in our study are reported for the first time for reproductive stage salinity stress. Fine-mapping of selected putative QTLs will be the next step to facilitate marker-assisted backcrossing and to detect useful genes for salinity tolerance at the reproductive stage in rice.

    • Author Affiliations


      Reza Mohammadi1 2 Merlyn S. Mendioro3 Genaleen Q. Diaz3 Glenn B. Gregorio1 Rakesh K. Singh1

      1. Plant Breeding, Genetics and Biotechnology Division, International Rice Research Institute, DAPO, Box 7777, Metro Manila, Philippines
      2. Agricultural Biotechnology Research Institute of Iran (ABRII), North West and West Region, Tabriz, Iran
      3. Genetics and Molecular Biology Division, Institute of Biological Sciences, University of the Philippines, Los Baños, Philippines
    • Dates

  • Journal of Genetics | News

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      Posted on July 25, 2019

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