Photosynthetic performance was estimated as the in vivo fluorescence of chlorophyll a of PSII by using a portable Pulse Amplitude Modulation fluorometer (PAM-2500, Walz, Germany).
Photosynthetic performance was estimated as the in vivo fluorescenceof chlorophyll a of PSII by using a portable PulseAmplitude Modulation fluorometer (PAM-2500, Walz,Germany).