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The effects of neodymium application mode on the disease index, PAL, POD and PPO activity, content of lignin and generation rate of ·O_2~- in cucumbers were investigated by pot experiment. The results suggest that the disease index decreases after spraying Nd~ 3+ . Relative protection effects of at-the-same-time-group, induced-group and therapy-group are 7.51%, 27.14% and 11.51%. The PAL activity of Nd+Fo treatment in at-the-same-time-group, induced-group and therapy-group increases by 9.86%, 48.57% and 4.97% respectively compared with that of Fo treatment. The POD activity decreases by 27.52%, 35.87% and 7.67%. The PPO activity increases by 5.75%, 36.58% and 52.19%. The ·O_2~- generation rate decreases by 9.49%, 28.08% and 25.21%. The lignin content increases 5.55%, 5.25% and 11.25%. In conclusion, induced-group has the best effect in decreasing disease index, decreasing ·O_2~- generation rate and increasing PAL and POD activity; therapy-group has the best effect in increasing PPO activity and content of lignin.
The effects of neodymium application mode on the disease index, PAL, POD and PPO activity, content of lignin and generation rate of · O_2 ~ - in cucumbers were investigated by pot experiment. The results suggest that the disease index decreases after spraying Nd ~ 3 +. Relative protection effects of at-the-same-time-group, induced-group and therapy-groups are 7.51%, 27.14% and 11.51%. The PAL activity of Nd + Fo treatment at- the- same-time- The POD activity increases by 27.52%, 35.87% and 7.67%. The PPO activity increases by 5.75%, 36.58%, respectively. % and 52.19%. The O_2 ~ - generation loss decreases by 9.49%, 28.08% and 25.21%. In conclusion, induced-group has the best effect in decreasing disease index , decreasing · O2 - - generation rate and increasing PAL and POD activity; therapy-group has the best effect in increasing PPO activity and content of lignin.