*2.8. Measurement of Photosynthetic Efficiency*

The efficiency of photosynthesis was non-invasively monitored using a pulse-amplitudemodulation (PAM) chlorophyll fluorometer in each plant grown under different light wavelengths. Plants were placed in a dark environment for 30 min before the PAM measurement to obtain the maximum quantum efficiency of PSII (Fv/Fm). Then, PAM measurements were conducted under dim light using Junior-PAM (WALZ, Effeltrich, Germany).
