Journal article
Identification of several small main-effect QTLs and a large number of epistatic QTLs for drought tolerance related traits in groundnut (Arachis hypogaea L.)
Theoretical and Applied Genetics, Vol.122(6), pp.1119-1132
2011
Abstract
Cultivated groundnut or peanut (Arachis hypogaea L.), an allotetraploid (2n = 4x = 40), is a self pollinated and widely grown crop in the semi-arid regions of the world. Improvement of drought tolerance is an important area of research for groundnut breeding programmes. Therefore, for the identification of candidate QTLs for drought tolerance, a comprehensive and refined genetic map containing 191 SSR loci based on a single mapping population (TAG 24 × ICGV 86031), segregating for drought and surrogate traits was developed. Genotyping data and phenotyping data collected for more than ten drought related traits in 2–3 seasons were analyzed in detail for identification of main effect QTLs (M-QTLs) and epistatic QTLs (E-QTLs) using QTL Cartographer, QTLNetwork and Genotype Matrix Mapping (GMM) programmes. A total of 105 M-QTLs with 3.48–33.36% phenotypic variation explained (PVE) were identified using QTL Cartographer, while only 65 M-QTLs with 1.3–15.01% PVE were identified using QTLNetwork. A total of 53 M-QTLs were such which were identified using both programmes. On the other hand, GMM identified 186 (8.54–44.72% PVE) and 63 (7.11–21.13% PVE), three and two loci interactions, whereas only 8 E-QTL interactions with 1.7–8.34% PVE were identified through QTLNetwork. Interestingly a number of co-localized QTLs controlling 2–9 traits were also identified. The identification of few major, many minor M-QTLs and QTL × QTL interactions during the present study confirmed the complex and quantitative nature of drought tolerance in groundnut. This study suggests deployment of modern approaches like marker-assisted recurrent selection or genomic selection instead of marker-assisted backcrossing approach for breeding for drought tolerance in groundnut.
Details
- Title
- Identification of several small main-effect QTLs and a large number of epistatic QTLs for drought tolerance related traits in groundnut (Arachis hypogaea L.)
- Authors/Creators
- K. Ravi (Author/Creator) - International Crops Research Institute for the Semi-Arid TropicsV. Vadez (Author/Creator) - International Crops Research Institute for the Semi-Arid TropicsS. Isobe (Author/Creator) - Kazusa DNA Research InstituteR.R. Mir (Author/Creator) - International Crops Research Institute for the Semi-Arid TropicsY. Guo (Author/Creator) - University of GeorgiaS.N. Nigam (Author/Creator) - International Crops Research Institute for the Semi-Arid TropicsM.V.C. Gowda (Author/Creator) - University of Agricultural Sciences, DharwadT. Radhakrishnan (Author/Creator) - Directorate of Groundnut ResearchD.J. Bertioli (Author/Creator) - Universidade Católica de BrasíliaS.J. Knapp (Author/Creator) - Institute of Plant Breeding, Genetics and Genomics, The University of Georgia, Athens, USAR.K. Varshney (Author/Creator) - International Crops Research Institute for the Semi-Arid Tropics
- Publication Details
- Theoretical and Applied Genetics, Vol.122(6), pp.1119-1132
- Publisher
- Springer Verlag
- Identifiers
- 991005541354207891
- Copyright
- © 2010 The Authors.
- Murdoch Affiliation
- Murdoch University
- Language
- English
- Resource Type
- Journal article
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- Collaboration types
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- Citation topics
- 3 Agriculture, Environment & Ecology
- 3.4 Crop Science
- 3.4.96 QTL
- Web Of Science research areas
- Agronomy
- Genetics & Heredity
- Horticulture
- Plant Sciences
- ESI research areas
- Agricultural Sciences