Epistatic interactions of major effect drought QTLs with genetic background loci determine grain yield of rice under drought stress

Yadav, S and Sandhu, N and Majumder, R R and Dixit, S and Kumar, S and Singh, S P and Mandal, N P and Das, S P and Yadaw, R B and Singh, V K and Sinha, P and Varshney, R K and Kumar, A (2019) Epistatic interactions of major effect drought QTLs with genetic background loci determine grain yield of rice under drought stress. Scientific Reports (TSI), 9 (1) (2616). pp. 1-13. ISSN 2045-2322

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Epistatic interactions of QTLs with the genetic background and QTL-QTL interaction plays an important role in the phenotypic performance of introgression lines developed through genomic-assisted breeding (GAB). In this context, NIL pairs developed with various drought QTL (qDTY) combinations in the genetic background of IR64, TDK1-Sub1 and Savitri backgrounds were utilized to study the interactions. Multi-season phenotyping of NIL pairs harboring similar qDTY combinations provided contrasting performance for grain yield under drought (RS) (classified as high and low yielding NILs) but nearly similar performance under non-stress(NS) conditions. Genome wide genotyping data revealed a total of 16, 5 and 6 digenic interactions were detected under RS conditions in low yielding NILs of IR64, TDK1-Sub1 and Savitri respectively while no significant interaction was found in high yielding NILs under RS and NS conditions in any of the genetic backgrounds used in this study. It is evident from this study that existence of epistatic interactions between QTLs with genetic background, QTL-QTL interaction and interactions among background markers loci itself on different chromosomes influences the expression of a complex trait such as grain yield under drought. The generated information will be useful in all the GAB program of across the crops for precise breeding.

Item Type: Article
Divisions: Research Program : Genetic Gains
Uncontrolled Keywords: Drought, Rice, drought stress, genotyping, genomic interactions, QTLs, QTL interactions, drought-related traits, genomic-assisted breeding
Subjects: Others > Drought Tolerance
Others > Plant Breeding
Others > Rice
Others > Genetics and Genomics
Depositing User: Mr Ramesh K
Date Deposited: 12 Mar 2019 09:57
Last Modified: 17 Jan 2020 03:11
URI: http://oar.icrisat.org/id/eprint/11089
Official URL: http://dx.doi.org/10.1038/s41598-019-39084-7
Acknowledgement: The authors are thankful for the support received from genotyping service laboratory (GSL)-IRRI during the process of genotyping and technical support from M.T. Sta Cruz and P. Maturan in conducting the field experiments. This study was supported by the Bill and Melinda Gates Foundation through STRASA (Stress Tolerant Rice for Africa and South Asia) project. Authors thank BMGF for the financial support to the study.
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