decreased, and the decrease in SLA may reduce the light energy
absorption.
If the excessive light energy that has been absorbed by photosynthetic
apparatus cannot be dissipated rapidly, it may reduce the
photosynthetic efficiency and results in photoinhibition and even
damage to the photosynthetic reaction center. For instance, photosystem
I can be readily photoinhibited by high light stress, and
high light also inhibit the repair of photosystem II (Takahashi and
Murata, 2008). In this study, although the high PPDF of 450 and
550 mol m−2 s−1 promoted the higher fresh weight, dry weight
and health index of the young plants (Table 2), this was marginally
so, and the analysis of the leaf structure, stomata traits and Pn
(Tables 3 and 4, Fig. 3) showed that the high light probably caused
damage to the photosynthetic organelles.