Abstract

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.

Details

Title
Epistatic interactions of major effect drought QTLs with genetic background loci determine grain yield of rice under drought stress
Author
Yadav Shailesh 1 ; Sandhu Nitika 1 ; Majumder, Ratna Rani 1 ; Dixit Shalabh 1 ; Kumar, Santosh 2 ; Singh, S P 3 ; Mandal, N P 4 ; Das, S P 5 ; Yadaw Ram Baran 6 ; Singh, Vikas Kumar 7 ; Sinha Pallavi 8 ; Varshney, Rajeev K 8   VIAFID ORCID Logo  ; Kumar, Arvind 1 

1  International Rice Research Institute, Rice Breeding Platform, Metro Manila, Philippines (GRID:grid.419387.0) (ISNI:0000 0001 0729 330X) 
2  ICAR Research Complex for Eastern Region, Patna, India (GRID:grid.419387.0) 
3  Bihar Agricultural University, Sabour, India (GRID:grid.418317.8) (ISNI:0000 0004 1787 6463) 
4  National Rice Research Institute, Central Rainfed Upland Rice Research station, Hazaribagh, India (GRID:grid.418317.8) 
5  ICAR Research Complex for NEH Region, Tripura Centre, Lembucherra, India (GRID:grid.469932.3) (ISNI:0000 0001 2203 3565) 
6  Regional Agriculture Research Station, NARC, Bara, Nepal (GRID:grid.466943.a) (ISNI:0000 0000 8910 9686) 
7  South Asia Hub, ICRISAT, International Rice Research Institute, Patancheru, India (GRID:grid.419337.b) (ISNI:0000 0000 9323 1772) 
8  International Crops Research Institute for the Semi-arid Tropics, Patancheru, India (GRID:grid.419337.b) (ISNI:0000 0000 9323 1772) 
Publication year
2019
Publication date
Dec 2019
Publisher
Nature Publishing Group
e-ISSN
20452322
Source type
Scholarly Journal
Language of publication
English
DOI
https://doi.org/10.1038/s41598-019-39084-7
ProQuest document ID
2185066659
Copyright
This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.