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Feeding of BA (1.4 mL of 0.285 mm in 0.1 m KPi buffer, pH 6.8) to two 14-d-old de-rooted broad bean plants via the hypocotyls for 24 h and betalain analysis of hypocotyl extracts by HPLC. A, Control (0.1 m KPi buffer, pH 6.8); B, BA feeding (0.285 mm in 0.1 m KPi buffer, pH 6.8). Scales of A475 (full scale = 0.07 absorbance units) are the same in A and B.
