Identification of main effect and epistatic quantitative trait loci for morphological and yield-related traits in peanut (Arachis hypogaea L.)

Khedikar, Y and Pandey, M K and Sujay, V and Singh, S and Nayak, S N and Klein-Gebbinck, H W and Sarvamangala, C and Mukri, G and Garg, V and Upadhyaya, H D and Nadaf, H L and Gowda, M V C and Varshney, R K and Bhat, R S (2018) Identification of main effect and epistatic quantitative trait loci for morphological and yield-related traits in peanut (Arachis hypogaea L.). Molecular Breeding, 38(1) (7). pp. 1-12. ISSN 1380-3743

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Abstract

An effort was made in the present study to identify the main effect and epistatic quantitative trait locus (QTL) for the morphological and yield-related traits in peanut. A recombinant inbred line (RIL) population derived from TAG 24 × GPBD 4 was phenotyped in seven environments at two locations. QTL analysis with available genetic map identified 62 main-effect QTLs (M-QTLs) for ten morphological and yield-related traits with the phenotypic variance explained (PVE) of 3.84–15.06%. Six major QTLs (PVE > 10%) were detected for PLHT, PPP, YPP, and SLNG. Stable M-QTLs appearing in at least two environments were detected for PLHT, LLN, YPP, YKGH, and HSW. Five M-QTLs governed two traits each, and 16 genomic regions showed co-localization of two to four M-QTLs. Intriguingly, a major QTL reported to be linked to rust resistance showed pleiotropic effect for yield-attributing traits like YPP (15.06%, PVE) and SLNG (13.40%, PVE). Of the 24 epistatic interactions identified across the traits, five interactions involved six M-QTLs. Three interactions were additive × additive and remaining two involved QTL × environment (QE) interactions. Only one major M-QTL governing PLHT showed epistatic interaction. Overall, this study identified the major M-QTLs for the important productivity traits and also described the lack of epistatic interactions for majority of them so that they can be conveniently employed in peanut breeding.

Item Type: Article
Divisions: Research Program : Genetic Gains
CRP: CGIAR Research Program on Grain Legumes
Uncontrolled Keywords: Peanut, QTLanalysis, Epistatic interaction, Agro-morphological traits, Yield
Subjects: Others > Plant Breeding
Mandate crops > Groundnut
Others > Genetics and Genomics
Depositing User: Mr Ramesh K
Date Deposited: 28 Dec 2017 05:23
Last Modified: 01 Feb 2018 09:20
URI: http://oar.icrisat.org/id/eprint/10381
Official URL: http://dx.doi.org/10.1007/s11032-017-0764-z
Projects: UNSPECIFIED
Funders: UNSPECIFIED
Acknowledgement: This work has been undertaken as part of the CGIAR Research Program on Grain Legumes. ICRISAT is a member of CGIAR Consortium. The authors would like to thank Erin Higgins for valuable comments to improve the quality of the manuscript.
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