title: Construction of chromosome segment substitution lines in peanut (Arachis hypogaea L.) using a wild synthetic and QTL mapping for plant morphology.
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. ipaënsis×A. 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 line×trait 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.
authors.affiliation: CIRAD, UMR AGAP, Montpellier, France.
authors.forename: Daniel
authors.initials: D
authors.lastname: Fonceka
authors.forename: Hodo-Abalo
authors.initials: HA
authors.lastname: Tossim
authors.forename: Ronan
authors.initials: R
authors.lastname: Rivallan
authors.forename: Hélène
authors.initials: H
authors.lastname: Vignes
authors.forename: Elodie
authors.initials: E
authors.lastname: Lacut
authors.forename: Fabien
authors.initials: F
authors.lastname: de Bellis
authors.forename: Issa
authors.initials: I
authors.lastname: Faye
authors.forename: Ousmane
authors.initials: O
authors.lastname: Ndoye
authors.forename: Soraya C M
authors.initials: SC
authors.lastname: Leal-Bertioli
authors.forename: José F M
authors.initials: JF
authors.lastname: Valls
authors.forename: David J
authors.initials: DJ
authors.lastname: Bertioli
authors.forename: Jean-Christophe
authors.initials: JC
authors.lastname: Glaszmann
authors.forename: Brigitte
authors.initials: B
authors.lastname: Courtois
authors.forename: Jean-François
authors.initials: JF
authors.lastname: Rami
mesh_terms: D010367:Arachis / Q000033:anatomy & histology* / Q000235:genetics*; D001947:Breeding; D016009:Chi-Square Distribution; D002874:Chromosome Mapping / Q000379:methods*; D032461:Chromosomes, Plant / Q000235:genetics*; D019143:Evolution, Molecular; D056426:Genetic Loci / Q000235:genetics; D018745:Genome, Plant / Q000235:genetics; D006579:Heterozygote; D007178:Inbreeding; D010641:Phenotype; D040641:Quantitative Trait Loci / Q000235:genetics*; D019655:Quantitative Trait, Heritable