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Plant Physiology 63:152-155 (1979)
© 1979 American Society of Plant Biologists

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Articles

Movement of Kinetin and Gibberellic Acid in Leaf Petioles during Water Stress-induced Abscission in Cotton 1

Thomas L. Davenport2, Wayne R. Jordan3 and Page W. Morgan

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

Movement of [14C]kinetin and [14C]gibberellic acid was examined in cotton (Gossypium hirsutum L.) cotyledonary petiole sections independent of label uptake or exit from the tissue. Sections 20 millimeters in length were taken from well watered, stressed, and poststressed plants. Transport capacity was determined using a pulse-chase technique. Movement of both kinetin and gibberellic acid was found to be nonpolar with a velocity of 1 millimeter per hour or less, suggesting passive diffusion. Neither water stress nor anaerobic conditions during transport of labeled material affected the transport capacity of the petioles.

Results suggested strong kinetin binding but weak gibberellic acid binding in the tissue sections. Apparent binding of both growth regulators was unaltered by the experimental conditions. Movement of these two growth regulators within cotton cotyledonary petioles plays a minor role in the stress-induced, foliar abscission process.

2 Present address: University of Florida, IFAS, Agricultural Research and Education Center, 18905 S. W. 280 Street, Homestead, Florida 33031.

3 Present address: Texas A&M University, Blackland Research Center, Box 748, Temple, Texas 76501.

1 This research was supported in part by a grant from Cotton Incorporated. A contribution of the Texas Agricultural Experiment Station.






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Copyright © 1979 by the American Society of Plant Biologists