ETHYLENE AND ACC: MOBILE WILTING FACTORS IN FLOWERS.
In isolated carnation petals, wilting of the upper part is dependent on the presence of the basal part. Mor et al. (Physiol. Plant. 65:196–202, 1985) showed that ACC, which is produced in the basal part, is translocated to the upper part. Treatment with ACC induces wilting in intact petals but is without effect in excised upper petal parts. This indicates that wilting in upper parts requires an additional factor which is derived from the basal part. Treatment of excised upper parts with a combination of ACC and ethephon or ACC and ethylene restores the normal wilting response. These results, therefore, indicate that both ACC and ethylene are translocated from the basal part to the upper part of the petal.
The role of ACC and ethylene and the possible involvement of other mobile wilting factors in the coordination of flower senescence is discussed.