Abstract
The possibility that plant auxins affect the methyl esterification of cell wall pectic substances has been suggested by Bennet-Clark (1955) and others. Recently Ordin, Cleland and Bonner (1957) have presented evidence that indolacetic acid (IAA) affects the rate of incorporation of methionine methyl groups into cell wall pectic substances. According to these workers, the findings support the hypothesis that esterification of carboxyl groups of pectin is involved in the auxin mechanism of cell expansion. These reports have suggested to us that a study of higher plant pectic enzymes and of chemical substances affecting their activity might provide new tools and information useful in studying possible auxin-pectic enzyme relationships. McColloch and Kertesz (1947) reported that soaps and alkyl aryl sulfonate detergents powerfully inhibited tomato pectin-methylesterase (PM) activity in vitro . However, since detergents are protein-denaturing agents, it was stated that the observed inhibition might be due to this effect. This communication reports a study of the effects of chain lengths of fatty acid salts and alkyl sulfates on their inhibition of PM.
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