The Effect of Chlorflurenol on Geosensitivity and Light Inhibition of Cress Roots

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Abstract
Gravity-induced directional growth of cress seedling roots is abolished by methyl-2-chloro-9-hydroxyfluorene-9-carboxylate (chlorflurenol) at a concentration (0·75 //M) which does not prevent longitudinal growth. The characteristic distorted growth of horizontally orientated cress roots when exposed to light is also abolished in the presence of chlorflurenol, which induces straight growth as occurs when the root is orientated vertically or grown horizontally in the dark. This effect of chlorflurenol supports the view that the light inhibition of horizontally growing roots is a consequence of a heightened geosensitivity.

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