Substituted 5-(cyclohex-2-en-1-yl)-penta-2,4-dienes and 5-(cyclohex-2-en-1-yl)-pent-2-en-4-ynes as active agents against abiotic stress in plantsThe invention relates to substituted 5-(cyclohex-2-en-1-yl)penta-2,4-dienes and 5-(cyclohex-2-en-1-yl)pent-2-en-4-ynes of the formula (I) and their salts where the radicals R1, R2, R3, R4, [X—Y] and Q are each as defined in the description, to processes for preparation thereof and to the use thereof for enhancing stress tolerance in plants with respect to abiotic stress, and/or for increasing plant yield.