The effect of kinetin on nucleic acids and nucleases of excised barley leaves.

and color of the treated area which has been suggeste(l to act as a metabolic siiik (6). The stimulation of both RNA and l)rotein synthesis b) kinetic in tobacco (8) aiid Xmanthinmn (7) leaves has been reported, lanl MIcCalla, 'Moore and Osborne (5) using another kinin, the benzyladenine-C14, have obtained tentative evideence that label was incorporated into RNA although at a very low rate. Wollgielhn and Parthier (13) have recently shois n that chloraillphenicol and thiouracil accelerated the yellowing of (letaclie(l tobacco leaves and the breakdown of RNA and protein which was prevented by kinetiii. All these findings have indicated that kinetin in some way maintains the level of RNA and thus keeps protein synthesis going in detached leaves. Since the level of RNA