Absence of fluence rate dependency of phytochrome modulation of stem extension in light-grown Sinapis alba L. |
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Authors: | D. C. Morgan R. Child H. Smith |
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Affiliation: | (1) Department of Botany, Adrian Building, University of Leicester, University Road, LE1 7RH Leicester, U.K. |
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Abstract: | In background white light, supplementary far-red (max 700 nm) is an order of magnitude less effective than supplementary far-red (max 739 nm) in the stimulation of stem extension in Sinapis alba. The relationship between phytochrome photoequilibrium and extension rate increase for the two supplementary far-red treatments is, however, very similar. This evidence indicates that phytochrome cycling is not involved in the phytochrome control of stem extension in light-grown Sinapis alba and that the response to supplementary far-red light is not fluence rate (irradiance) dependent.Abbreviations Pfr far-red absorbing form of phytochrome - the phytochrome photoequilibrium (Pfr/Ptotal) |
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Keywords: | Cycling rate Phytochrome Sinapis Stem extension |
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