Fig. 3.

Effect of HRW on the production of endogenous NO during adventitious rooting. The primary root system was removed from the hypocotyls of 5-d-old, germinated cucumber seedlings. NO levels of hypocotyls were determined by Greiss reagent in explants treatment with distilled water (control) or 50 % HRW for 24 h. Values (means ± SE) are the averages of three independent experiments (n = 3). Asterisks indicate that mean values are significantly different between the treatments of HRW and Control (P < 0.05) according to Duncan’s multiple test