Molecular Mapping of QTLs for Yield and Related Traits in Oryza sativa cv Swarna x O. nivara (IRGC81848) Backcross Population

Abstract

Abstract: Advanced backcross QTL analysis was used to identify QTLs for seven yield and yield-related traits in a BC2F2 population from the cross between a popular Oryza sativa cv Swarna and O. nivara IRGC81848. Transgressive segregants with more than 15% increased effect over Swarna were observed for all the traits except days to heading and days to 50% flowering. Thirty QTLs were detected for seven yield and yield-related traits using interval and composite interval mapping. Enhancing alleles at 13 (45%) of these QTLs were derived from O. nivara, and enhancing alleles at all the QTLs for stem diameter and rachis diameter were derived from O. nivara. Three stem diameter QTLs, two rachis diameter QTLs and one number of secondary branches QTL identified by both Interval and composite interval mapping contributed more than 15% of the total phenotypic variance. The QTL epistasis was significant for stem diameter and plot yield. The most significant QTLs qSD7.2, qSD8.1 and qSD9.1 for stem diameter, qRD9.1 for rachis diameter and qNSB1.1 for number of secondary branches are good targets to evaluate their use in marker-assisted selection. O. nivara is a good source of novel alleles for yield related traits and reveals major effect QTLs suitable for marker-assisted selection.

Key words: Oryza sativa, Oryza nivara, stem diameter, rachis diameter, yield, yield components, quantitative trait locus

B. P. MALLIKARJUNA SWAMY1,,K. KALADHAR, M. S. RAMESHA, B. C. VIRAKTAMATH, N. SARLA. Molecular Mapping of QTLs for Yield and Related Traits in Oryza sativa cv Swarna x O. nivara (IRGC81848) Backcross Population[J]. RICE SCIENCE.

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