Photostimulation of Hydroxypyruvate Reductase Activity in Peroxisomes of Pharbitis nil Seedlings : II. photoreceptors in Blue Light

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The action spectrum for stimulation of hydroxypyruvate reductase (HPR) activity in etiolated cotyledons of Pharbitis nil shows the three effective regions of blue (B), red (R), and far red (FR), with high B efficiency. Light duration response curves and kinetics of stimulation in continuous light were compared at 455 nm, 660 nm and 710 nm. Before 10 h, the efficiencies at455 and 660 nm were higher than that at 710 nm. After 10 h, Iengthening of the 660 nm irradiation was ineffective while lengthening of the 710 and 455 nm irradiation caused linear increases in HPR activity. These results together with the effect of pre-R-irradiation on FR or B stimulation suggest that two pigments are simultaneously involved in the B Iight effect: phytochrome and a specific blue-absorbing pigment. Phytochrome may be the main effective pigment up to 10 h in blue light while the blue-absorbing pigment may be more effective for longer ex-posures.
日本植物生理学会の論文