Abstract
The level of plastidic glutamine synthetase (GS; EC 6.3.1.2) in the cotyledonary whorl of the Scots pine (Pinus sylvestris L.) seedling was previously reported to be regulated by light. In the present paper we report on the control by light of the GS transcript level. A full-length GS cDNA clone of Scots pine was isolated (pGS1), sequenced and employed to measure GS transcript levels. Using dichromatic light treatments it was found that the transcript level is regulated by phytochrome. The strong specific effect of blue light is to be attributed to an increase of the responsiveness to phytochrome. Since no direct correlation between the transcript level and the rate of GS protein synthesis was observed, it was concluded that GS gene expression is only coarsely regulated at the level of transcript accumulation. Synthesis of GS protein is by itself light-dependent (light-mediated fine tuning of gene expression). This control at the translational level is also exerted via phytochrome with blue light determining the reponsiveness of the process toward phytochrome. If the level of the far-red absorbing form of phytochrome (Pfr) is kept very low, blue light is not capable of bringing about synthesis of GS protein.
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Abbreviations
- B:
-
blue light
- D:
-
darkness
- Fd-GOGAT:
-
ferredoxin-dependent glutamate synthase (EC 1.4.7.1)
- GS:
-
glutamine synthetase (EC 6.3.1.2)
- R:
-
red light
- RG9:
-
long-wavelength far-red light
- φλ=Pfr/Ptot:
-
far-red absorbing form of phytochrome/total phytochrome, wavelength-dependent equilibrium of the phytochrome system
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Research supported by Heidelberger Akademie der Wissenschaften (Forschungsstelle Nitratassimilation) and Deutsche Forschungs-gemeinschaft (Schwerpunkt Physiologie der Bäume) and SFB 206. Nucleotide sequence of pGS1 registrated by EMBL Data Library; accession number: X 74429.
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Elmlinger, M.W., Bolle, C., Batschauer, A. et al. Coaction of blue light and light absorbed by phytochrome in control of glutamine synthetase gene expression in Scots pine (Pinus sylvestris L.) seedlings. Planta 192, 189–194 (1994). https://doi.org/10.1007/BF01089034
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DOI: https://doi.org/10.1007/BF01089034