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Upregulated genes in lettuce plants grown in soils with long‐term organic versus mineral fertilization (DOK‐LTE, HUB‐LTE). The 2–ΔΔCt method (Kuramae et al., 2012) was employed for relative quantification (n = 4). Error bars indicate 95% confidence interval. Asterisks denote significant (p < 0.05) differences in ΔCt values between organic versus mineral fertilization within each site revealed by Tukey's HSD pairwise testing.
