Figure 3. Effects of ETH inhibitor on H₂-induced adventitious root development.

The primary root system was removed from hypocotyls of 7-day-old germinated cucumber. Explants of cucumber were incubated with 0.5 µM ethephon, 50% HRW, 50% HRW + 0.5 µM ethephon, 50% HRW + 1 µM AVG, 50% HRW+ 0.1 µM AgNO₃/NaNO₃ and indicated for 7 days. The number (A) of adventitious roots per explant were expressed as mean ±  SE (n = 20 explants from each of four independent experiments). Bars with different lowercase letters were significantly different (Duncan’s multiple range test, P < 0.05. Photographs (B–G) show hypocotyl explants after 7 days of the treatments indicated.