A	Net photosynthetic rate
APX	Ascorbate peroxidase
AsA	Ascorbate
Ci	Intercellular CO2
DHA	Dehydroascorbate
DTI	Drought tolerance index
E	Transpiration rate
EL	Electrolyte leakage
ΦEo	Maximum quantum yield of electron transport
Fo	Initial fluorescence
Fv/Fm	Maximum quantum yield of primary photochemistry
gs	Stomatal conductance
GSH	Glutathione
GSSG	Oxidized glutathione
Jmax	Maximum rate of electron transport
LRWC	Leaf relative water content
MDA	Malondialdehyde
PIABS	Performance index
Pro	Proline
RC/ABS	Proportion of active reaction centers
Sm	Energy needed to reduce reaction centers
SOD	Superoxide dismutase
Vcmax	Rubisco maximum carboxylation rate
WUE	Water use efficiency