Quantitative trait loci for partial resistance to Pseudomonas syringae pv. maculicola in Arabidopsis thaliana

Rant Jenni C., Arraiano Lia S., Chabannes Matthieu, Brown James K.M.. 2013. Quantitative trait loci for partial resistance to Pseudomonas syringae pv. maculicola in Arabidopsis thaliana. Molecular Plant Pathology, 14 (8) : 828-837.

https://doi.org/10.1111/mpp.12043

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Résumé : Segregation of partial resistance to Pseudomonas syringae pv. maculicola (Psm) ES4326 was studied in the recombinant inbred population created from accessions (ecotypes) Columbia (Col-4), the more susceptible parent, and Landsberg (Ler-0). Plants were spray inoculated with lux-transformed bacteria in experiments to measure susceptibility. The amount of disease produced on a range of Col ¥ Ler lines by spray inoculation was highly correlated with that produced by pressure infiltration of bacteria into the apoplast. Quantitative trait locus (QTL) analysis identified four loci that contributed to partial resistance: QRps.JIC-1.1, QRps.JIC-2.1, QRps.JIC-3.1 and QRps.JIC-5.1 on chromosomes 1, 2, 3 and 5, respectively. QRps.JIC-3.1, located 8.45 cM from the top of the consensus genetic map of chromosome 3, had a large, approximately additive effect on partial resistance, explaining 50% of the genetic variation in this population. Fine mapping narrowed the region within which this QTL was located to 62 genes. A list of candidate genes included several major classes of resistance gene.

Mots-clés Agrovoc : Pseudomonas syringae, Arabidopsis thaliana, gène, résistance aux maladies, carte génétique, locus des caractères quantitatifs

Mots-clés complémentaires : QTL

Classification Agris : H20 - Maladies des plantes
F30 - Génétique et amélioration des plantes

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

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