S p e c ifi c ialty nctio f.-th e E n z y m e .__ '''.'''.'.........-.''.--''''''''''''''''-'-' -'-''''113 Specifici y of the Enzyme 134 Chemistry of the Enzyme ..... 135 Mechanism of Action 13 5 Oxidation Products.13 8 Factors Influencing Action.141 Temperature, Oxygen, Time, Concentrations .141 1H.141 Natural Inhibitors.141 Occurrence and Distribution.143 Chemistry.143 Physiological Function.144 Lght.144 Daylength.146 Chemical Promoters.147 Coenzymes ... 147 Inhibitor Removers and Inactivators.150 Chemical Inhibitors 151 Direct Enzyme Inhibitors . .. .151 Com petitive Inhibitors 1.........5.. 141 Coenzyme Oxidation ......... 153 Natural Inhibitor Promotion. 153 Non-enzymatic Destruction of IAA 156 Assay Techniques 157 Extraction and Puriication 157 Incubation .Rv . ..... 157 Determination ......... 158 Literature Citedn.158.xiato 158