Chelating Agents as Growth Substances


SINCE the article1 under the above title was published, we have obtained further biological evidence bearing on the mode of action of auxin. We carried out two root-growth experiments exactly similar to those of 23.3.56 and 21.4.56 (Tables 4 and 5, loc. cit.) but using 8-hydroxyquinoline and ethylene-diaminetetra-acetate instead of 3-indolylacetic acid and ethylenediaminetetra-acetate. Essentially similar results were obtained, that is, the inhibition of root growth caused by 10−5 M 8-hydroxyquinoline or 10−5 M ethylenediaminetetra-acetate alone was largely prevented by the presence of 10−11 M ethylenediaminetetra-acetate in the former case or of 10−11 M 8-hydroxyquinoline in the latter.

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  1. 1

    Heath, O. V. S., and Clark, J. E., Nature, 177, 1118 (1956).

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