Plant growth-regulators representing the indole, phenoxy, and naphthoxy types of structure were tested to determine their effect on the activity of an alpha-amylase secreted by virus tumor tissue from the roots of Rumex acetosa grown in vitro. 2. At concentrations up to and including 100 p.p.m. they had no significant effect on its activity. The greatest effect was within the limit of experimental error.
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Brakke et al. (1952) studied this question.
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