Representation of 7 out of 24 QT-clusters obtained using the expression values of the 3,056 stress-related genes differentially expressed in at least one condition/genotype. The cluster analyses was performed with a minimum cluster size of 30 and a correlation value of 0.75. The three treatments, grouped by genotypes, are plotted on x axis. The relative expression level (data normalized to the median for each probe set) is plotted on the y axis. The horizontal lines represent the average expression of all probe sets belonging to each cluster. 1,376 probe sets didn't fit the QT-clustering parameters.