Abstract
Potted plants (cultivar ‘Napoli’) were maintained at 3 levels of moisture (continuously moist, moderate moisture stress and severe moisture stress) and sprayed to run-off with 3 levels of ethephon (0, 250 and 500 p.p.m.) in factorial combination, in order to examine the effect of moisture status on the ethephon-accelerated ripening-response in tomatoes. The largest increases in ripening-rate occurred where plants were moderately stressed and sprayed with 250 p.p.m. ethephon, or where plants were kept continuously moist and sprayed with 500 p.p.m. ethephon. No substantial increase in ripening-rate occurred at higher levels of either ethephon or moisture stress. Leaf senescence was rapid in all treatments other than the moderately stressed and continuously moist controls. In some of the water-stressed treatments a partial recovery of plant water potential occurred as a result of reduced transpiration due to rapid and extensive leaf loss.
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