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以两年生‘王林’苹果为试材，研究了水杨酸（ＳＡ）对苹果叶片中过氧化氢（Ｈ２Ｏ２）水平的调节及其机制。结果表明，０．２５～１０．０ｍｍｏｌ·Ｌ－１ＳＡ能明显提高叶片中Ｈ２Ｏ２水平，其机制不仅在于ＳＡ抑制了过氧化氢酶（ＣＡＴ）活性，从而抑制了Ｈ２Ｏ２的降解使其积累，而且还由于ＳＡ提高了超氧化物歧化酶（ＳＯＤ）活性，促进了超氧阴离子（Ｏ－２）向Ｈ２Ｏ２的歧化反应，因而增加了Ｈ２Ｏ２的生成量。ＳＡ还诱导了特异的过氧化物酶（ＰＯＤ）同工酶，这可能也与Ｈ２Ｏ２的积累有关
Using two-year ’Wanglin’ apple as test material, the regulation of salicylic acid (SA) on the level of hydrogen peroxide (H2O2) in apple leaves and its mechanism were studied. The results showed that 0.25 ~ 10.0 mmol·L-1 SA significantly increased the level of H2O2 in leaves, not only because SA inhibited the activity of catalase (CAT), but inhibited the degradation of H2O2 to accumulate, SA increased the activity of superoxide dismutase (SOD) and promoted the disproportionation reaction of superoxide anion (O-2) to H2O2, thus increasing the production of H2O2. SA also induced specific peroxidase (POD) isoenzymes, which may also be related to the accumulation of H2O2