Chlorophyll a fluorescence (ChlF) may assess the integrity
and efficiency of the photosynthetic apparatus
and the overall health of the plant tissue (Roháček and
Barták, 1999). Changes in ChlF emissions, arising mainly
from PSII, provide information on almost all aspects of
photosynthetic activity. Therefore, ChlF had also widely
been used to probe photosynthetic function in higher
plants and exhibit plant tolerance to environmental stresses