(RB) are shown in Table 1. However, totally radiated photosynthetic
photon flux (PPF) in all treatments was set at 133 ± 5 mol m−2
s
−1
,
which was got by adjusting the distance between plants and lights
and was measured with a light quantum meter (Model 1400, LICOR, USA). The photoperiod was 14 h d
−1
for all the treatments