Fig. 4. Concentrations of sucrose (A, D), glucose (B, E) and fructose (C, F) in the column + labellum of half-open flowers (A–C) and open flowers (D–F) of cut Dendrobium cv. Khao Sanan inflorescences held in distilled water () or in a solution of HQS + AgNO3 + 4 g L−1 sucrose (). Data are means of 6 replications ± SE.