Effects of Hydrogen Peroxide on the Germination Characteristics of Cucumber Seeds

There is increasing interest in the role of hydrogen peroxide (H₂O₂) in regulating growth and death in plants. This research aimed to reveal the effect of H₂O₂ on the germination characteristics of cucumber seeds. H₂O₂ concentrations(0, 0.01, 0.1 and 1 mmol ldr L^-1) were set up to study the effect of different treatments on such indexes as the germination rate, the germination potential, germination index, growing vigor index, the length and width of taproot and hypocotyledonary axis of cucumber. The results showed that low concentration H₂O₂ (0-0.01 mmol ldr L^-1) increased the germination potential, germination index, the length of taproot and the length of hypocotyledonary axis, but decreased the growing vigor index, number of fist later root and fresh weight. Under the high concentrations(0.01-1 mmol ldr L^-1), all those germination indexes decreased with the increasing of H2O2 concentrations. The result of subordination function showed that 0.01 mmol ldr L^-1 H₂O₂ concentration had promoted the seed germination and growth of cucumber and was the better treatment concentration.