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Timing of the initial action of phytochrome with regard to protochlorophyll synthesis in the mustard seedling

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Summary

Significant accumulation of photoconvertible protochlorophyll(ide) in the cotyledons of the mustard seedling takes place from 24 h after sowing onwards (25° C). The rate of accumulation in darkness is greatly increased by a pretreatment with red or far-red light. The strong effect of continuous red light, given from the time of sowing, remains fully reversible by a 756 nm-light pulse up to about 18 h after sowing. On the other hand, the effect of continuous far-red light which can be detected at 15 h after sowing is not influenced by a subsequent application of 756 nm-light pulses. An interpretation of the data requires the concept that continuous red light and continuous far-red light act from different sites. This conclusion is based on a comparison of the present data with the earlier published data on phytochromemediated anthocyanin synthesis in the mustard seedling cotyledons.

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Abbreviations

PChl:

protochlorophyll(ide)

Chl:

chlorophyll(ide)

Ptr :

far-red absorbing form of the phytochrome system (physiologically active)

Pr :

red absorbing form of the phytochrome system

[Ptot]:

[Pr]+[Pfr]

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Authors and Affiliations

  1. Biologisches Institut II, Universität Freiburg i.Br., Schänziestraße 9, D-7800, Freiburg i.Br., Federal Republic of Germany

    H. Kasemir, P. Huber & H. Mohr

Authors
  1. H. Kasemir
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  2. P. Huber
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  3. H. Mohr
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Supported by a grant from the Deutsche Forschungsgemeinschaft (SFB 46).

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Kasemir, H., Huber, P. & Mohr, H. Timing of the initial action of phytochrome with regard to protochlorophyll synthesis in the mustard seedling. Planta 132, 157–160 (1976). https://doi.org/10.1007/BF00388897

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  • DOI: https://doi.org/10.1007/BF00388897

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