Sayegh-Alhamdia Majd auteur aut IRD Marmey Philippe auteur aut IRD Jalloul A. auteur aut IRD Champion Antony auteur aut IRD Petitot Anne-Sophie auteur aut IRD Clérivet Alain auteur aut IRD Nicole Michel auteur aut IRD text journalArticle eng text/pdf born digital access In cotton plants (Gossypium hirsutum L.), the interaction with the bacterial pathogen Xanthomonas campestris pv. malvacearum (Xcm) is governed by the gene-for-gene concept. The interaction between the cultivar Reba B50 and the race 18 of Xcm leads to an hypersensitive reaction (HR); this cultivar is, however, susceptible to the race 20, with the death of the plant as a consequence. Previous work showed that the induced HR was correlated with 9S-lipoxygenase (LOX) activity responsible for lipid peroxidation. A LOX gene (GhLOX1) whose activity is involved in cell death during HR was characterized. In this study, we investigated whether the lipoxygenase response could be related to cotton resistance in different cotton Xcm combinations. Various combinations of R - avr genes were selected to assess whether the GhLOX1 gene transcription and LOX activity could be correlated with the resistance phenotype. Cotton genotypes with the B2B3, B(2)b(6) or B-12 genes, or cotton near-isogenic lines containing single B genes (B-2, b(6)) were infected by race 1, 18 or 20 of Xcm. Phenotypes were analysed for all interactions tested. For incompatible interactions, the LOX response appears to be concomitantly triggered during cotton resistance strengthening the previous evidence that this reaction is a key event of hypersensitive cell death. specialized Lipoxygenase Xanthomonas Gossypium hirsutum Bacterial blight Hypersensitive reaction 076 156 9 542-549 2008 0931-1785 https://www.documentation.ird.fr/hor/fdi:010042717 10.1111/j.1439-0434.2008.01409.x 0931-1785 [F B010042717] https://www.documentation.ird.fr/hor/fdi:010042717 https://www.documentation.ird.fr/intranet/publi/2008/08/010042717.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2008-09-19 2017-08-23 fdi:010042717 fre