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Biplot of principle component analysis for the first two principle components of all parameters, cultivars, salinity levels and two growing seasons. Fv/Fm, maximum quantum PSII photochemical efficiency; ΦPSII, quantum yield of PSII; qP, photochemical quenching coefficient; NPQ, non-photochemical quenching; Pn, net photosynthesis rate; gs, stomatal conductance; E, respiration rate.
