KINETICS OF THE PHOTO-INHIBITION OF STEM GROWTH IN PISUM SATIVUM AND TROPAEOLUM MAJUS

. A kinetic model is proposed to account for the time/intensity response curves for the photo-inhibition of stem elongation in Pisum and Tropaeolum. Two separate mechanism are involved; the first inhibiting effect reached a constant value in a time small compared with the time scale of the experiments, and the second was an exponential function of the daily duration of irradiation.