Abstract
Summary Growth analysis, IAA oxidase and both cytoplasmic and ionically bound wall peroxidase activities were investigated during the entire period of cotton fibre development. IAA oxidase and peroxidase activities recorded low levels during the elongation phase while during the secondary thickening phase these activities increased significantly. It is suggested that IAA oxidase in vivo may regulate the levels of IAA. The close correlation between cessation of elongation growth and increase in wall peroxidase points to an important role of this enzyme in the termination of the elongation phase. Its role as a wall rigidifying factor is discussed. Electrophoresis data supported the view that both IAA oxidase and peroxidase activities are associated with a single protein molecule.
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