Abstract
Unilateral blue light administered to corn coleoptile segments produces no alteration of transmembrane potential on the light side, and only a small and slow hyperpolarization on the dark side. Red light causes a 5-15 millivolt depolarization in cells on the light side causes and somewhat smaller effects on the dark side. Blue given after red causes a rapid hyperpolarization on both sides of the coleoptile. The effect of the potentiating red preirradiation is probably due to phytochrome, being largely abolished by far-red given after red, but before the blue light. The effect of prior red irradiation decays in the dark, showing a half-time of about 45 minutes at room temperature. This rapid cooperativity between phytochrome and the phototropic pigment may indicate a common locale, possibly in a membrane.
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Selected References
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- Asomaning E. J., Galston A. W. Comparative study of phototropic response & pigment content in oat & barley coleoptiles. Plant Physiol. 1961 Jul;36(4):453–464. doi: 10.1104/pp.36.4.453. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Briggs W. R., Chon H. P. The physiological versus the spectrophotometric status of phytochrome in corn coleoptiles. Plant Physiol. 1966 Sep;41(7):1159–1166. doi: 10.1104/pp.41.7.1159. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Cleland R. E., Prins H. B., Harper J. R., Higinbotham N. Rapid Hormone-induced Hyperpolarization of the Oat Coleoptile Transmembrane Potential. Plant Physiol. 1977 Mar;59(3):395–397. doi: 10.1104/pp.59.3.395. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Higinbotham N., Etherton B., Foster R. J. Mineral ion contents and cell transmembrane electropotentials of pea and oat seedling tissue. Plant Physiol. 1967 Jan;42(1):37–46. doi: 10.1104/pp.42.1.37. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Kang B. G., Burg S. P. Red light enhancement of the phototropic response of etiolated pea stems. Plant Physiol. 1974 Mar;53(3):445–448. doi: 10.1104/pp.53.3.445. [DOI] [PMC free article] [PubMed] [Google Scholar]