In this study, the higher Chl contents
were observed in 50 and 20% treated plants and might at least
partially explained the higher photosynthetic rates in leaves of
these treated plants, which is consistent with the previous report
[2]. However, the lowest Pn and the highest Chl content appeared
simultaneously in the plants under severe shade (5% irradiance)
treatment, which is differed from previous studies [2,21].