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Effective quantum yield of PSII photochemistry, ΦPSII (A,B) and photochemical quenching coefficient, qP, (C,D) estimated in leaves of two wheat varieties (Enola and Slomer) grown with two nitrogen supply levels (1 N and 0.2 N) and subjected to osmotic stress with 25% PEG. Different letters represent significant differences at p < 0.05 (n = 8).
