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Plant and Cell Physiology, 1984, Vol. 25, No. 6 1039-1043
© 1984

Article

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

Francoise Tchang1, Alain Lecharny2 and Paul Mazliak1

1Laboratoire de Physiologie Cellulaire, Université P. & M. Curie Tour 53, 4 Place Jussieu, 75005 Paris, France
2Laboratoire du Phytotron, Centre National de la Recherche Scientifique 91190 Gif-sur-Yvette, France

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 at 455 and 660 nm were higher than that at 710 nm. After 10 h, lengthening 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 light 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 exposures.

(Received November 22, 1983; Accepted June 20, 1984)
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