The action spectrum for blue-light-stimulated oxygen uptake in Chlorella.

Abstract

The action spectrum for the stimulation of oxygen uptake by blue light was determined for Chlorella pyrenoidosa. The action spectrum is limited to wavelengths shorter than 550 m[mu] and has peaks at 460 and 375 m[mu]. The peaks are separated by a definite minimum at 400 m[mu]. The action spectrum indicates that the responsible pigment is a flavin. The effect is not closely coupled to system 2 of photosynthesis because the uptake was not inhibited by 10-5 [image] DCMU [3-(3,4-dichlorophenyl)-l,l-dimethylurea)].