Construction of Chromosome Segment Substitution Lines in Peanut (Arachis hypogaea L.) Using a Wild Synthetic and QTL Mapping for Plant Morphology

Fonceka, D. and Tossim, H-A. and Rivallan, R. and et al, . (2012) Construction of Chromosome Segment Substitution Lines in Peanut (Arachis hypogaea L.) Using a Wild Synthetic and QTL Mapping for Plant Morphology. PLOS One, 7 (11). pp. 1-11.

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Abstract

Chromosome segment substitution lines (CSSLs) are powerful QTL mapping populations that have been used to elucidate the molecular basis of interesting traits of wild species. Cultivated peanut is an allotetraploid with limited genetic diversity. Capturing the genetic diversity from peanut wild relatives is an important objective in many peanut breeding programs. In this study, we used a marker-assisted backcrossing strategy to produce a population of 122 CSSLs from the cross between the wild synthetic allotetraploid (A. ipae¨nsis6A. duranensis)4x and the cultivated Fleur11 variety. The 122 CSSLs offered a broad coverage of the peanut genome, with target wild chromosome segments averaging 39.2 cM in length. As a demonstration of the utility of these lines, four traits were evaluated in a subset of 80 CSSLs. A total of 28 lines showed significant differences from Fleur11. The line6trait significant associations were assigned to 42 QTLs: 14 for plant growth habit, 15 for height of the main stem, 12 for plant spread and one for flower color. Among the 42 QTLs, 37 were assigned to genomic regions and three QTL positions were considered putative. One important finding arising from this QTL analysis is that peanut growth habit is a complex trait that is governed by several QTLs with different effects. The CSSL population developed in this study has proved efficient for deciphering the molecular basis of trait variations and will be useful to the peanut scientific community for future QTL mapping studies.

Item Type: Article
Additional Information: This study was funded by the Cirad and the Generation Challenge Programme grants number G3005.05, G4008.49, and G4007.13.03. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript
Author Affiliation: CIRAD, UMR AGAP, Montpellier, France,
Subjects: Crop Improvement
Divisions: Groundnut
Depositing User: Mr Siva Shankar
Date Deposited: 03 Dec 2012 05:58
Last Modified: 03 Dec 2012 05:58
Official URL: http://dx.doi.org/10.1371/journal.pone.0048642
URI: http://eprints.icrisat.ac.in/id/eprint/8959

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