Ethylene Evolution following Treatment with 1-Aminocyclopropane-1-carboxylic Acid and Ethephon in an in Vitro Olive Shoot System in Relation to Leaf Abscission

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Abstract
1-Aminocyclopropane-1-carboxylic acid (ACC) supplied via the cut base of detached olive shoots [cv. Manzanillo] caused a burst of ethylene from leaves but other cyclopropanes tested did not exhibit this effect. Ethephon (ET) and another ethylene-releasing compound caused a prolonged increase in ethylene evolution. ACC had only a very limited effect on leaf abscission regardless of concentration; shoots placed with cut bases in ET for 60-80 min exhibited 100% leaf abscission within 90 h. Shoots with inflorescences treated with ET just prior to anthesis began to wilt in vitro within 20-30 h and failed to exhibit leaf abscission. At earlier stages of development, ET induced more leaf abscission on reproductive shoots than on vegetative shoots. The duration of ethylene evolution from the leaves may govern their potential for abscission and bursts of ethylene evolution, even though large in amount, may not induce abscission.