Physiological Study of Ethephon- and ACC-Induced Fruitlet and Leaf Abscission in Peach Trees Under Different Conditions of Temperature

Abstract The effect of temperature on the ability 2-chloroethylphosphonic acid (ethephon, ETH) and 1-aminocyclopropane carboxylic (ACC) to induce ethylene production in fruitlets abscission leaves when applied at postbloom (~15 mm fruit diameter) was studied using 5-year-old ‘Sweet Lady’/Rootpac-20 peach [ Prunus persica (L.) Batsch] trees kept pots environment-controlled growth rooms. ETH 150 mg L −1 ACC 500 effectively thinned peaches. Increasing from 10 20 °C pronounced ETH-induced leaf ACC-induced decreased stomatal conductance leaves. However, thinning not affected by increasing temperature, as well ETH- quantum yield PSII photochemistry. Changes peak were related response.