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Published online 1 January 2005
Published in Crop Sci 45:123-140 (2005)
© 2005 Crop Science Society of America
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QTL Analysis of Cotton Fiber Quality Using Multiple Gossypium hirsutum x Gossypium barbadense Backcross Generations

Jean-Marc Lacapea,*, Trung-Bieu Nguyena, Brigitte Courtoisa, Jean-Louis Belotb, Marc Gibanda, Jean-Paul Gourlota, Gérard Gawryziaka, Sandrine Roquesa and Bernard Haua

a CIRAD, Avenue Agropolis, 34398 Montpellier, Cedex 5, France
b CIRAD, Projet Cône Sud, SHIS/QI15, Conjunto 15, Casa 3, Lago Sul, 71635-350, Brasilia DF, Brazil


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  		Fig. 1. Histograms for fiber quality properties in the three populations BC1 (plain), BC2 (hashed), and BC2S1 (empty bars). Values of the G. hirsutum (variety Guazuncho 2, GUA) and of the G. barbadense (variety VH8) parent in each of the BC1 (plain triangle), BC2 (empty triangle), and BC2S1 (star) generation are indicated

 

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  		Fig. 2. Map positions and LOD likelihood confidence intervals, LOD 1 as bars and LOD 2 as boxes, for QTL associated with fiber quality. For putative QTLs (LOD value above 2.5 but below permutation-based thresholds), confidence intervals are indicated at a LOD 1 (bars). Referring to the phenotypic effect conferred by the G. barbadense parent, plain boxes indicate QTLs of "positive" (also denoted as "+") effect, and empty boxes indicate QTLs of "negative" ("–") effect. For ease of representation of linkage groups, most AFLP loci (noninformative for homeologous and across-map alignments), are not shown. Loci closest to peak LOD positions are underlined. Loci duplicated between homeologous A-subgenome and D-subgenome groups are connected. For details on loci denominations see Lacape et al. (2003) and Nguyen et al. (2004)

 

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  		Fig. 3. Graphical representation of the positions of QTL-rich regions mapped along the 26 chromosomes of the tetraploid cotton genome, as partitioned in 15 "carrier" and 11 "noncarrier" chromosomes. The 15 carrier chromosomes carry 19 QTL-rich "positive" regions (boxed in a plain frame), i.e., of a positive phenotypic effect conferred by the G. barbadense parent. Regions with "negative" QTLs (boxed in a dotted frame), indicating a negative phenotypic effect conferred by G. barbadense, are mapped along noncarrier and carrier chromosomes. Scale shown to the left is in cM.

 




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