Extracts from tissue cultures of crown-gall from Parthenocissus tricuspidata (Sieb. and Zucc.) Planch. exhibited cell division activity in the soybean cytokinin assay. The chromatographic migration of one component, responsible for most of the activity, is similar to that of zeatin ribonucleoside.
The normal strain shows undifferentiated chloroplasts in opposition to the very well chlorophyllated "callus" which shows all the normal ultrastructural characteristics of the various organelles. The strain which has lost completely the capacity of chlorophyl synthesis shows a remarkable increase in
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