Phytochrome effect on free amino acid metabolism of higher plants

Publisher Website
Google Scholar
Abstract
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.