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The concentration of NO (brightness) in tomato roots fed with 0·5 mm (A, C) and 5 mm (B, D) nitrate. (A, B) The root tips, (C, D) the non-root tip regions (about 8 cm from root tip). The NO concentration was detected by fluorescence microscopy with DAF-FM DA (diaminofluorescein-FM diacetate). Scale bars = 1 mm.
