Abstract

THE work on this subject began at Rothamsted in November 1941 as a result of the previous study of the deformation of legume root hairs made by H. K. Chen, which indicated that the curling of root hairs by Rhizobium was due to the secretion by the latter of β-indolylacetic acid. Our first experiments were intended to discover whether a similar deformation of root hairs could be induced by β-indolylacetic acid itself and by related plant stimulants.

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