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Plant and Cell Physiology, 1978, Vol. 19, No. 4 617-625
© 1978

Article

Identification of zeatin and zeatin riboside in cones of the hop plant and their possible role in cone growth

Naoharu Watanabe, Takao Yokota and Nobutaka Takahashi

Department of Agricultural Chemistry, The University of Tokyo Bunkyo-ku, Tokyo, Japan

Cytokinin contents of fertilized cones, unfertilized cones and seeds of the hop plant (Humulus lupulus L.) were found to be 0.08 ppm (Benzyladenine equivalent), 0.03 ppm and 0.5 ppm respectively. Major cytokinin in the former two was determined to be zeatin riboside based on gas chromatography-mass spectrometry after several purification steps. Two more cytokinins were detected in fertilized cones, one of which was determined to be zeatin. The possible role of endogenous cytokinin in cone growth is discussed in terms of quantitative and qualitative data obtained. Furthermore, effective purification techniques introduced in this work are also discussed.

(Received December 2, 1977; )
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