Summary
Activated phytochrome lowers the free amino acid pools of all plants investigated by about 15%. The action of red light is preferentially directed to Asp, Glu and Phe. Exogenously supplied Leu-U-14C is incorporated more quickly into protein of red-light-treated samples compared with dark controls. In contrast, red light decreases the amount of Asp-U-14C incorporated into protein, but increases the amount of 14CO2 respired after feeding with Asp-U-14C. Red light has no effect on the amount of 14CO2 respired after feeding with Leu-U-14C. Red-light-mediated stimulation of incorporation of Leu-U-14C into protein occurred within 15 min, well before the red-light-mediated increase in 14CO2 production following feeding with Asp-U-14C could be detected.
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Abbreviations
- R:
-
red light
- FR:
-
far-red light
- R+FR:
-
red immediately followed by far-red light
- D:
-
dark control
- TCA:
-
tricarboxylic acid cycle
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For amino acids as stated in Biochem. J. 126, 773–780 (1972).
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Mitrakos, K., Margaris, N. Phytochrome effect on free amino acid metabolism of higher plants. Planta 116, 17–25 (1974). https://doi.org/10.1007/BF00390199
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DOI: https://doi.org/10.1007/BF00390199