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Normalized relative quantities (NRQ) of the TaFNRII gene estimated in winter wheat flag leaves of three varieties grown under different agricultural production systems. Symbols and bars represent the mean and confidence limits at 95% level, respectively. X-axis: Lanes 1-4: cv. Cubus collected in 2006; lanes 5-7: cv. Centenaire; collected in 2008; lanes 8-10: cv. Tommi; collected in 2008; triangle: conventional agriculture; circle: organic agriculture; square: no nitrogen applied.
