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    • Keywords


      rice; QTL; yield; introgression; Oryza nivara; O. sativa.

    • Abstract


      Advanced backcross QTL (AB-QTL) analysis was carried out in two Oryza nivara-derived BC2F2 populations. For nine traits, we identified 28 QTL in population 1 and 26 QTL in population 2. The two most significant yield-enhancing QTL, yldp9.1 and yldp2.1 showed an additive effect of 16 and 7 g per plant in population 1, while yld2.1 and yld11.1 showed an additive effect of 11 and 10 g per plant in population 2. At least one O. nivara-derived QTL with a phenotypic variance of >15% was detected for seven traits in population 1 and three traits in population 2. The O. nivara-derived QTL ph1.1, nt12.1, nsp1.1, nfg1.1, bm11.1, yld2.1 and yld11.1 were conserved at the same chromosomal locations in both populations. Two major QTL clusters were detected at the marker intervals RM488–RM431 and RM6–RM535 on chromosomes 1 and 2, respectively. The colocation of O. nivara-derived yield QTL with yield meta-QTL on chromosomes 1, 2 and 9 indicates their accuracy and consistency. The major-effect QTL reported in this study are useful for marker-assisted breeding and are also suitable for further fine mapping and candidate gene identification.

    • Author Affiliations


      B. P. Mallikarjuna Swamy1 2 K. Kaladhar1 G. Ashok Reddy1 B. C. Viraktamath1 N. Sarla1

      1. Directorate of Rice Research, Rajendranagar, Hyderabad 500 030, India
      2. Plant Breeding, Genetics and Biotechnology Division, International Rice Research Institute, DAPO Box 7777, Metro Manila, Philippines
    • Dates

  • Journal of Genetics | News

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      Posted on July 25, 2019

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