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Plant and Cell Physiology, 1979, Vol. 20, No. 1 75-81
© 1979

Article

Effects of the new plant growth retardants of quaternary ammonium iodides on gibberellin biosynthesis in Gibberella fujikuroi

Kwang Yun Cho, Akira Sakurai, Yuji Kamiya, Nobutaka Takahashi and Saburo Tamura

The Institute of Physical and Chemical Research Wako-shi, Saitama 351, Japan

The effects of twelve quaternary ammonium iodides, synthesized as plant growth relardants, on the biosynthesis of gibberellins in the culture of Gibberella fujikuroi were investigated. Of the two compounds with the strongest growth-retarding activity, N,N,N-trimethyl-1-methyl-(3',3',5'-trimethylcydohexyl)-2-propenyl ammonium iodide (1) was found to inhibit the biosynthesis, while N,N,N-trimethyl-l-methyl-(3',3',5'5'- tetramethylcyclohexyl)-2-propenyl ammonium iodide (2) was not. The results on examination of the twelve analogues indicate that their plant growth-retarding activity is not related to the inhibition of gibberellin biosynthesis.

(Received July 18, 1978; )
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