524 SUBJECT INDEX 



Zein, 251 173, 253, 275, 308-309, 325, 344, 371 



Zinc, 38, 308-309 toxicity of, 446 



induction of variants by, 443 Zonation, 18, 358-359 



permeability to, 468 Zygotropism, 374 



physiological effects of, 139, 142, 157, Zymonic acid, 181 



