On the basis of tests with over 20 species of erect plants, we reported in 1962 (9) that a strong growth curvature develops in the axis when an erect plant is rotated slowly on a horizontal clinostat. A differential transport of endogenous auxin was indicated by the production of a similar, predictable curvature after the application of triiodobenzoic acid '
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Charles J. Lyon (1965) studied this question.