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Non-photochemical quenching of chlorophyll fluorescence, ΦNPQ (A,B) and quantum efficiency of non-photochemical quenching, ΦNO (C,D) 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).
