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. 1979 Jan;63(1):218-20.
doi: 10.1104/pp.63.1.218.

Effect of red light on geotropism in pea epicotyls

J A McArthur  1
Affiliations

Effect of red light on geotropism in pea epicotyls

J A McArthur. Plant Physiol. 1979 Jan.

Abstract

Dose response curves were determined for phytochrome phototransformation and for a phytochrome-controlled decrease in geotropic curvature in epicotyls of dark-grown Pisum sativum L. cv. Alaska. Ten times as much light was required to produce a spectrophotometrically detectable transformation of phytochrome as was required to produce a significant change in the geotropic response. The red light energy required for a 50% phytochrome transformation caused a 90% change in the physiological response.

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