Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Plant Physiology 46:334-336 (1970)
© 1970 American Society of Plant Biologists

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Articles

Cytokinin and Inhibitor Activities in the Avocado Fruit Mesocarp 1,2

S. Gazita and A. Blumenfeldb,3

a The Hebrew University of Jerusalem, Faculty of Agriculture, Rehovot, Israel, The Volcani Institute of Agricultural Research, Bet Dagan, Israel

No cytokinin activity was found in methanolic mesocarp extracts after purification with petroleum ether and ethyl acetate. Cytokinin activity did appear, however, in aqueous fraction after acid hydrolysis or passage through Dowex 50 (H+) ion exchange columns. The level of this activity, the fruit growth rate, and the cell division rate were found to be positively correlated (with each other).

An inhibitor to cytokinin activity in soybean callus bioassay was found in the petroleum ether fraction; this inhibitor is not abscisic acid. The activity of the inhibitor could be considerably reduced by raising the level of kinetin in the nutrient medium. The intensity of inhibition was found to be positively correlated with reduction in the rate of mesocarp growth.

The reduction in fruit growth rate may be considered to be due to the diminution of bound cytokinin activity and (or) increased activity of an endogenous inhibitor.

3 Present address: Michigan State University, East Lansing, Michigan 48823.

1 Contribution from the Volcani Institute of Agricultural Research, Bet Dagan, Israel, 1969 Series, No. 1628-E.

2 This research was financed in part by a grant from the United States Department of Agriculture under Public Law 480, United States Department of Agriculture Grant FG-Is-206.






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