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The influence of light quality on the phytochrome content of light grown Sinapis alba L. and Phaseolus aureus Roxb.

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Abstract

The effect on the phytochrome system of light regimes establishing a range of photoequilibria was studied in two light grown dicotyledonous plants, both of which were treated with the herbicide SAN 9789 to prevent chlorophyll accumulation. In Sinapis alba L. cotyledons the results are comparable with phytochrome behaviour in etiolated mustard seedlings; the level of Pfr becomes independent of wave-length whereas the total phytochrome level is wave-length dependent. Contrasting properties are exhibited in Phaseolus aureus Roxb. leaves in which total phytochrome is unaffected by light quality; consequently the Pfr level is dependent on wavelength. Nevertheless, the amount of phytochrome in mung leaves increased after transfer to darkness suggesting that light still has a profound influence on the phytochrome system, even though light quality during the light period and prior to darkness does not.

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Abbreviations

FR:

far-red light

WL:

white light

PAR:

photosynthetically active radiation

Pfr:

far-red light absorbing form of phytochrome

Pr:

red light absorbing form of phytochrome

Ptot:

total phytochrome level (=Pr+Pfr)

ϕ:

Pfr/Pfr+Pr

SAN 9789:

4-chloro-5-(methylamino) 2(α,α,α trifluoro-m tolyl)-3(2H)-pyridazinone

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Authors and Affiliations

  1. Department of Botany, University of Reading, Whiteknights, RG6 2AS, Reading, UK

    C. A. H. Kilsby & C. B. Johnson

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  1. C. A. H. Kilsby
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  2. C. B. Johnson
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Kilsby, C.A.H., Johnson, C.B. The influence of light quality on the phytochrome content of light grown Sinapis alba L. and Phaseolus aureus Roxb.. Planta 153, 109–114 (1981). https://doi.org/10.1007/BF00384091

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  • DOI: https://doi.org/10.1007/BF00384091

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