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Induction of Leaf Abscission in Cotton Is a Common Effect of Urea- and Adenine-Type Cytokinins
Vol. 95, No. 1 (Jan., 1991), pp. 234-237
Published by: American Society of Plant Biologists (ASPB)
Stable URL: http://www.jstor.org/stable/4273368
Page Count: 4
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Cytokinins of the urea and adenine type induced leaf abscission in young cotton (Gossypium hirsutum) plants in the following order of activity: N-phenyl-N′-1,2,3-thiadiazol-5-ylurea (thidiazuron) » N-phenyl-N′-(2-chloro-4-pyridyl)urea > isopentenyladenine ≥ 6-benzyladenine > zeatin = dihydrozeatin > kinetin. It is suggested that ethylene production is implicated in this response because it was stimulated by the compounds in cotton leaf discs with nearly the same effectiveness. Moreover, similar to thidiazuron (JC Suttle  Plant Physiol 78: 272-276), isopentenyladenine-induced defoliation was inhibited by aminoethoxyvinylglycine, and the effect was restored by 1-aminocyclopropane-1-carboxylic acid.
Plant Physiology © 1991 American Society of Plant Biologists (ASPB)