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Plant and Cell Physiology, 1974, Vol. 15, No. 2 315-319
© 1974

Article

Auxin-gibberellin relationships in their effects on hypocotyl elongation of light-grown cucumber seedlings III. Gibberellin specificity in its enhancing effect on IAA-induced elongation

Masayuki Katsumi and Haruko Kazama

Biology Department, International Christian University Mitaka, Tokyo 181, Japan

Pretreatment effects of different gibberellins, helminthosporic acid, cyclic AMP and Kinetin on subsequent IAA-induced elongation were tested in cucumber hypocotyl sections. Gibberellin A7 was more active than GA3, while gibberellin A3 was almost inactive. Both helminthosporic acid and cyclic AMP mimicked GA3-action, though the degree of their activity was less. Kinetin pretreatment resulted in marked inhibition of IAA-induced elongation. The pretreatment effect of GA3 was also reflected in a greater responce of the sections to synthetic auxins.

(Received October 6, 1973; )
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