Activity of indoleacetic acid oxidase was shown to increase following a period of water stress. Two fractions of indoleacetic acid oxidase were extracted from plant extracts. Similarly, two protein peaks (determined by ultraviolet absorption) were isolated. One peak, associated with an indoleacetic acid oxidase peak, increased following water stress. The second peak, not associated with extractable indoleacetic acid oxidase, decreased after water stress. The results are discussed in terms of general growth effects.
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Ben Darbyshire (1971) studied this question.
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