Quantitative trait locus analysis and construction of consensus genetic map for drought tolerance traits based on three recombinant inbred line populations in cultivated groundnut (Arachis hypogaea L.)

    Gautami, B and Pandey, M K and Vadez, V and Nigam, S N and Ratnakumar, P and Krishnamurthy, L and Radhakrishnan, T and Gowda, M V C and Narasu, M L and Hoisington, D A and Knapp, S J and Varshney, R K (2012) Quantitative trait locus analysis and construction of consensus genetic map for drought tolerance traits based on three recombinant inbred line populations in cultivated groundnut (Arachis hypogaea L.). Molecular Breeding, 30 (2). pp. 757-772. ISSN 1572-9788

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    Abstract

    Groundnut (Arachis hypogaea L.) is an important food and cash crop grown mainly in semi-arid tropics (SAT) regions of the world where drought is the major constraint on productivity. With the aim of understanding the genetic basis and identification of quantitative trait loci (QTL) for drought tolerance, two new recombinant inbred line (RIL) mapping populations, namely ICGS 76 × CSMG 84-1 (RIL-2) and ICGS 44 × ICGS 76 (RIL-3), were used. After screening of 3,215 simple sequence repeat (SSR) markers on the parental genotypes of these populations, two new genetic maps were developed with 119 (RIL-2) and 82 (RIL-3) SSR loci. Together with these maps and the reference map with 191 SSR loci based on TAG 24 × ICGV 86031 (RIL-1), a consensus map was constructed with 293 SSR loci distributed over 20 linkage groups, spanning 2,840.8 cM. As all these three populations segregate for drought-tolerance-related traits, a comprehensive QTL analysis identified 153 main effect QTL (M-QTL) and 25 epistatic QTL (E-QTL) for drought-tolerance-related traits. Localization of these QTL on the consensus map provided 16 genomic regions that contained 125 QTL. A few key genomic regions were selected on the basis of the QTL identified in each region, and their expected role in drought adaptation is also discussed. Given that no major QTL for drought adaptation were identified, novel breeding approaches such as marker-assisted recurrent selection (MARS) and genomic selection (GS) approaches are likely to be the preferred approaches for introgression of a larger number of QTL in order to breed drought-tolerant groundnut genotypes.

    Item Type: Article
    Divisions: UNSPECIFIED
    CRP: UNSPECIFIED
    Uncontrolled Keywords: Peanut, Drought tolerance, Consensus map, QTL analysis, Main-effect QTL, Epistatic QTL, Molecular breeding
    Subjects: Mandate crops > Groundnut
    Depositing User: Users 6 not found.
    Date Deposited: 29 Nov 2011 08:21
    Last Modified: 17 Jan 2013 03:28
    URI: http://oar.icrisat.org/id/eprint/4475
    Official URL: http://dx.doi.org/10.1007/s11032-011-9660-0
    Projects: UNSPECIFIED
    Funders: Indian Council of Agricultural Research , Consultative Group for International Agricultural Research, Bill and Melinda Gates Foundation
    Acknowledgement: Thanks are due to Mr. B.J. Moss and Mr. G. Somaraju for conducting lab experiments. Financial support from the National Fund of Indian Council of Agricultural Research (NBFSRA), New Delhi, India; the Tropical Legume I—Objective 1 project of CGIAR Generation Challenge Programme (http://www.generationcp.org), Mexico; the Bill and Melinda Gates Foundation (BMGF), USA; and the Consultative Group on International Agricultural Research (CGIAR) is gratefully acknowledged
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