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Ethylene, a Regulator of Young Fruit Abscission

John A. Lipe and Page W. Morgan
Plant Physiology
Vol. 51, No. 5 (May, 1973), pp. 949-953
Stable URL: http://www.jstor.org/stable/4263245
Page Count: 5
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Ethylene, a Regulator of Young Fruit Abscission
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Abstract

In an earlier study we reported that detached cotton flowers produced sufficient ethylene before the period of natural abscission to suggest that ethylene might be a natural regulator of young fruit abscission. The present report explores this probability further. Intact cotton (Gossypium hirsutum L.) fruits produced ethylene at rates as high as 36 μl ethylene/kg fresh wt.hr during the 2 days before they abscised. Direct measurements of ethylene in gas samples withdrawn from fruits indicated that production of 1 μl ethylene/kg fresh wt.hr is equivalent to an internal concentration of approximately 0.1 μl/1. Fumigation of fruiting cotton plants with only 0.5 μl/1 caused 100% abscission of young fruits and floral buds within 2 days. This correlated with the estimated endogenous levels of ethylene. Reduced pressure, which reduced the internal levels of ethylene, delayed abscission of young fruits and leaves, a result which supports our conclusion from this study--that ethylene is one of the regulators of young fruit abscission in cotton.

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