The dynamics of photosynthetic rate(Pn)is shown in Fig. 3.
After five days of LED illumination(62das)under 100or
300 molm−2 s−1 (PAR 100 and PAR 300,respe ctively),Pn did
not differ significantly among the four treatments under the
comparatively low light intensity(100molm−2 s−1) used for
measurements.