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

Author:
Khedikar, Yogendra, Pandey, ManishK., Sujay, V., Singh, Sube, Nayak, SpurthiN., Klein-Gebbinck, HenryW., Sarvamangala, Cholin, Mukri, Ganapati, Garg, Vanika, Upadhyaya, HariD., Nadaf, H.L., Gowda, M.V. C., Varshney, RajeevK., Bhat, RameshS.
Source:
Molecular breeding 2018 v.38 no.1 pp. 7
ISSN:
1380-3743
Subject:
Arachis hypogaea, breeding, epistasis, genomics, inbred lines, peanuts, phenotypic variation, pleiotropy, quantitative trait loci
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.
Agid:
5871896