Plant Physiol. Drug Metab Dispos
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Plant Physiology 55:308-311 (1975)
© 1975 American Society of Plant Biologists

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Articles

Ethylene-induced Leaf Abscission Is Promoted by Gibberellic Acid 1

Page W. Morgan and James I. Durham2

a Department of Plant Sciences, Texas A&M University, College Station, Texas 77843

Gibberellic acid (GA3) promoted leaf abscission from cotton (Gossypium hirsutum L.) plants exposed to ethylene. With mature plants, only the rate of abscission was increased, but when vegetative plants were exposed to ethylene for 4 days or less, the amount of abscission was increased markedly. Promotion of abscission occurred at near saturating ethylene levels (10 µl/liter), over a wide range of GA3 concentrations, and with both GA3 and GA7.

GA3 promoted abscission when Ethephon was substituted for ethylene and at locations not receiving direct application of GA3. The magnitude of the abscission promotion by GA3 was greater than that resulting from auxin transport inhibitors or abscisic acid. The characteristic inhibition of abscission by auxin occurred. The responses suggest that endogenous gibberellins may be involved in rapid abscission of apical leaves from vegetative cotton plants exposed to ethylene. Application of GA3 may offer an additional option in agricultural manipulation of abscission and dehiscence.

2 Present address: Department of Plant Pathology, Louisiana State University, Baton Rouge, La.

1 A contribution of the Texas Agricultural Experiment Station. Supported in part by a grant from Cotton Incorporated. Preliminary reports on the findings of this study have been made (Plant Physiol. 1974. 53: S-17; Proceedings 1974 Beltwide Cotton Products Research Conference, pp. 62-65).






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