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Reversible Effects of Green and Orange-Red Radiation on Plant Cell Elongation ¹

^a Department of Botany, University of Vermont, Burlington, Vermont 05401

The differential cell elongation of cress (Lepidium sativum) roots that results in geotropic bending can be decreased by green radiation with an action spectrum peaking at 550 nm. This decrease can be negated by prior or simultaneous irradiation by orange-red light with an action spectrum peaking at 620 nm. The green radiation appears to be effective during the cell elongation phase of geotropic response.

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