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对4个感病程度不同的玉米品种接种玉米矮化花叶病毒（MDMV）7d后植株叶片内过氧化物酶（PO）活性经研究表明：玉米接种病毒后PO活性均有提高，但提高幅度不同且酶活变化波形差异大。抗病品种接毒前酶活低且波形变化平稳，接毒后第2天酶活急剧增高且波形变化大，而感病品种接毒后酶活变化不大且波形一致。玉米PO同工酶酶谱简单，与对照比较，接毒后抗、感品种带纹数目变化不大，但带纹浓重而重叠。抗病品种接毒后第2天带纹突然加重，且持续增加，而感病品种有持续减弱趋势。
The activity of peroxidase (PO) in leaves of four maize dwarf mosaic virus (MDMV) plants after being inoculated with four susceptible maize varieties for 7 days showed that the activity of PO increased after the inoculation of corn, but the increase rate Different and changes in enzyme activity waveform difference. The resistant varieties had low enzyme activity and stable waveform change before exposure to the virus. The enzyme activity increased sharply and the waveform changed greatly on the second day after inoculation. However, the susceptible varieties did not change much in activity and had the same waveform after being infected with the susceptible strain. Enzyme zymogram of corn PO was simple. Compared with the control, the number of bands of anti-susceptible and susceptible varieties did not change much, but the bands were thick and overlapped. On the second day after infection, the susceptible varieties suddenly increased their patterns and continued to increase, while the susceptible varieties continued to weaken.