INTERACTION OF PETAL PORTIONS, HORMONES AND PROTEIN BIOSYNTHESIS IN THE RESPONSES OF CARNATION PETALS TO WATER STRESS
Pretreatment of detached petals with abscisic acid (ABA) or 1-aminocyclopropane-1-carboxylic acid (ACC) increases the sensitivity of the petals to water stress as reflected by advancing earlier inrolling. Removal of the basal portion of the petal resulted in diminished sensitivity of the rest of the petal to water stress. Pretreatment of petals for a short period with the protein synthesis inhibitor, cycloheximide, delayed the onset of inrolling and countered the effects of ABA, ACC and water stress.
We conclude that the presence of the basal part of the petal is essential for the sensing of water stress by carnation petals and their early response to it, and that ABA, ACC and protein biosynthesis are involved in these processes.