Phytochrome effect on free amino acid metabolism of higher plants

✍ Scribed by K. Mitrakos; N. Margaris

• Publisher: Springer-Verlag
• Year: 1974
• Tongue: English
• Weight: 453 KB
• Volume: 116
• Category: Article
• ISSN: 0032-0935
• DOI: 10.1007/bf00390199

✦ Synopsis

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 1~C0~ respired after feeding with Asp-U-14C. Red light has no effect on the amount of 14C02 respired after feeding with Leu-U-~4C. Red-light-mediated stimulation of incorporation of Leu-U-14C into protein occurred within 15 rain, well before the red-light-mediated increase in ~4C02 production following feeding with Asp-U-14C could be detected. * Abbreviations: For amino acids as stated in Biochem. J. 126, 773-780 (1972). R = red light, FR = far-red light, R -t-FR = red immediately followed by far-red light, D = dark control, TCA = tricarboxylie acid cycle.

2*