Targeted introgression of cotton fibre quality quantitative trait loci using molecular markers

Lacape Jean-Marc, Nguyen Trung-Bieu, Hau Bernard, Giband Marc. 2007. Targeted introgression of cotton fibre quality quantitative trait loci using molecular markers. In : Market-assisted selection: Current status and future perspectives in crops, livestock, forestry and fish. by Elcio Guimarães, John Ruane, Beate Scherf, Andrea Sonnino and James Dargie (ed.). Rome : FAO, 67-80.

Résumé : Within the framework of a cotton breeding programme, molecular markers are used to improve the efficiency of the introgression of fibre quality traits of Gossypium barbadense into G. hirsutum. A saturated genetic map was developed based on genotyping data obtained from the BC1 (75 plants) and BC2 (200 plants) generations. Phenotypic measurements conducted over three generations (BC1, BC2 and BC2S1) allowed 80 quantitative trait loci (QTL) to be detected for fibre length, uniformity, strength, elongation, fineness and colour. Positive QTL, i.e. those for which favourable alleles came from the G. barbadense parent, were harboured by 19 QTL-rich regions on 15 "carrier" chromosomes. In subsequent generations (BC3 and BC4), markers framing the QTL-rich regions were used to select about 10 percent of over 400 plants analysed in each generation. Although BC plants selected through the marker-assisted selection (MAS) process show promising fibre quality, only their full field evaluation will allow validation of the procedure.

Mots-clés Agrovoc : Gossypium barbadense, Gossypium hirsutum, marqueur génétique, Introgression, fibre végétale, qualité, amélioration des plantes, locus des caractères quantitatifs, propriété physicochimique

Mots-clés complémentaires : QTL

Classification Agris : F30 - Génétique et amélioration des plantes
Q60 - Traitement des produits agricoles non alimentaires

Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique

Auteurs et affiliations

• Lacape Jean-Marc, CIRAD-BIOS-UMR DAP (FRA)
• Nguyen Trung-Bieu
• Hau Bernard, CIRAD-PERSYST-UPR Systèmes cotonniers (FRA)
• Giband Marc, CIRAD-PERSYST-UPR Systèmes cotonniers (BRA) ORCID: 0000-0002-5553-5614

Source : Cirad - Agritrop (https://agritrop.cirad.fr/540513/)

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