Abstract
The induction by light of geotropic responsiveness in the primary roots of Zea mays L. (cv. Golden Cross Bantam 70) was found to be governed by the “all-or-none law”. The response was induced by light energies above a threshold value, but the maximal curvature of geo-stimulated roots was constand irrespective of the light energy above that threshold. The action spectrum for this light effect showed a large peak at 650, a small peak at 410, and a shoulder at 663 nm. The effect of red light was not reversed by far-red light. Thus, the geotropic response in Zea roots may not be controlled by phytochrome.
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Suzuki, T., Fujii, T. Spectral dependence of the light-induced geotropic response in Zea roots. Planta 142, 275–279 (1978). https://doi.org/10.1007/BF00385077
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DOI: https://doi.org/10.1007/BF00385077