Photostimulation of Hydroxypyruvate Reductase Activity in Peroxisomes of Pharbitis nil Seedlings: I. Action Spectrum

Hydroxypyruvate reductase activity in etiolated cotyledons ofPharbitis nil is highly stimulated by white light. The actionspectrum shows three effective regions: blue, red and far red.The main characteristics of this high irradiance reaction responseis a high blue efficiency and a low red efficiency. Experimentswith herbicide-treated plants demonstrated that chlorophyllis not involved in the regulation but suggest that a specificblue-absorbing pigment is involved, in addition to phytochrome. (Received November 22, 1983; Accepted June 20, 1984)