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Maximum quantum yield of photosystem II (PSII) (Fv/Fm), effective quantum yield of PSII (ΦPSII), and non-photochemical quenching (NPQ) measured on different tomato genotypes grown under a plastic walk-in tunnel. Bars are means ± standard error (n = 5). ANOVA with LSD post-hoc test was used to compare each genotype vs. the control genotype JAG8810 (green column). The asterisks indicate statistically significant differences at * p < 0.05; ** p < 0.01; *** p < 0.001.
