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  • Author or Editor: William Richard Graves x
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Ficus benjamina L. were subjected to 48 hr of polyethylene glycol (PEG)-induced water stress. Leaf abscission and concentrations of endogenous ethylene (C2H4) in the leaves were monitored. Leaf abscission began 24 to 48 hr after stress initiation, and most abscission occurred within the first 24 hr after water stress was relieved. PEG-stressed plants lost 35% to 47% of their leaves by 120 hr after the experiment was initiated. Older leaves abscised first and remained green throughout the abscission process. Endogenous C2H4 concentrations increased sharply and then declined during the first 6 hr of water stress. Endogenous C2H4 concentrations then increased gradually, and, by the time leaf abscission began, leaves contained 1.50 to 2.25 µl C2H4/liter.

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