Plant growth hormones are known to produce a number of striking effects on various processes including cell enlargement, root initiation, bud inhibition, etc. It has also been shown that the auxins, and indole-3-acetic acid in particular, participate in some general protoplasmic processes. Sup- port for this view has been most recently afforded in the demonstration by COMMONER and THIMANN (1) that this hormone is involved in part of the respiratory metabolism of plant cells.
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Commoner et al. (1942) studied this question.
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