Effect of Red Light on Geotropism in Pea Epicotyls | Zendy

James A. McArthur | Zendy; Winslow R. Briggs | Zendy

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Effect of Red Light on Geotropism in Pea Epicotyls

Author(s) -

James A. McArthur,

Winslow R. Briggs

Publication year - 1979

Publication title -

plant physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.554

H-Index - 312

eISSN - 1532-2548

pISSN - 0032-0889

DOI - 10.1104/pp.63.1.218

Subject(s) - phytochrome , pisum , gravitropism , sativum , botany , red light , epicotyl , biology , biophysics , chemistry , biochemistry , hypocotyl , arabidopsis , gene , mutant

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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