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壳聚糖是几丁质脱乙酰基后得到的一种氨基多糖。用16mg·L(-1)的壳聚糖溶液浸种，可提高玉米幼苗根系中苯丙氨酸解氨酶（PAL）、过氧化物酶（PO）和多酚氧化酶（PPO）3种防御酶的活性。抗病杂交种冀丰58号的酶活性升高幅度，大于感病杂交种掖单13号。壳聚糖浸种后再接种肿囊腐霉，3种防御酶的活性增强较单独壳聚糖浸种或单独接种肿囊腐霉更明显。
Chitosan is an amino polysaccharide obtained after chitin deacetylation. Seed soaking with 16 mg · L -1 chitosan could increase the defense of phenylalanine ammonia lyase (PAL), peroxidase (PO) and polyphenol oxidase (PPO) in the roots of maize seedlings Enzyme activity. The resistance increase of Jifeng 58 was more than the susceptible hybrid Yedan 13. After chitosan soaking inoculation, the activity of three defensive enzymes was more obvious than that of chitosan alone or inoculation alone.