nd 



ex 



Abnormal fruit, 223, 250 

 Abnormalities, plant, 291 



grains, 290 

 Abortion, ovule, 126, 229, 232, 234, 260, 

 303 



pollen, 303 

 Abscission, 9, 95, 106, 111. 232, 304 



anti-auxin effect, 113 



auxin dualism, 111 



auxin gradient theory, 112 



carbohydrate effect, 244, 248 



cinnamic acid, 113 



coffee leaf, 113 



death effect, 113 



destruction of auxin, 113 



ethylene, 111 



flowers, 109, 113,215,225 



frost, 303 



fruit drop, 242 



holly, 303 



orange leaf, 303 



orange stems, 251 



persistence of effect, 195 



temperature effect, 248 



tree fruits, 11 



tri-iodobenzoic acid, 113, 172 

 Absorption of auxin, 137, 271 



acidity role, 141 



age, 141 



carrier effects, 138, 286 



drying effect, 150 



environmental effects, 137 



esters, 141, 284 



from lanolin, 140 



rain effects, 140 



selectivity effect, 281 



stomatal role, 137 

 Absorption, nitrate, 136 

 Acetone, 17 

 Acetylene, 174, 254 

 Acidity 



auxin absorption role, 141 



auxin assay, 29, 38, 49 



auxin effectiveness, 26, 158 



auxin extraction. 16 



343 



auxin stability, 69, 70, 179 



of sprays. 189 



release of bound auxin, 67 



release of thiol esters, 181 



solubility effect, 189 

 Acids, fatty, 181 

 Acropetal transport, 81 

 Action spectrum, auxin destruction, 86 



phototropisra, 86, 97 

 Activated carbon, 196 

 Adaptive enzyme, 91 

 Adenine, 104. 211, 305 

 Adenosine, 103 

 Adenosine triphosphate, 179 

 Adsorption, by soils, 195 



activated carbon, 196 



in plants, 280 



on proteins, 67 

 Aeration, essential for growth, 183 



pea test effects, 36 



rooting effect. 212 

 Aerosol, 191, 221. 247 

 Agar, 14, 23 



concentration effects, 23, 26 



preparation, 24 

 Age, rooting effect, 210 



toxicity factor, 147 

 Agents, emulsifying, 139 



epinastic, 5, 174 

 Airplane spraying, 237, 246, 286, 288 

 Alaska pea, 31, 34, 36 

 Alcohol, 46 



ethyl, 15. 44, 51 



isopropyl, 51 

 Aldehydes. 67 

 Alkalinity, see Acidity 

 Almond, 246 

 Alternaria, 273 

 Amides, 158 



epinasty effects. 219 



fruit drop control, 245 



parthenocarpy effects, 219 



rooting effects, 207 

 Amylase, 130 

 Anatomical effects, 116 



