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Absence of fluence rate dependency of phytochrome modulation of stem extension in light-grown Sinapis alba L.

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Abstract

In background white light, supplementary far-red (λmax 700 nm) is an order of magnitude less effective than supplementary far-red (λmax 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.

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Abbreviations

Pfr:

far-red absorbing form of phytochrome

ϕ:

the phytochrome photoequilibrium (Pfr/Ptotal)

References

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Authors and Affiliations

  1. Department of Botany, Adrian Building, University of Leicester, University Road, LE1 7RH, Leicester, U.K.

    D. C. Morgan, R. Child & H. Smith

Authors
  1. D. C. Morgan
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  2. R. Child
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  3. H. Smith
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Morgan, D.C., Child, R. & Smith, H. Absence of fluence rate dependency of phytochrome modulation of stem extension in light-grown Sinapis alba L.. Planta 151, 497–498 (1981). https://doi.org/10.1007/BF00386545

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  • DOI: https://doi.org/10.1007/BF00386545

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