The present study was aimed to determine the status of phenolic metabolism and α-amylase inhibitor in maize genotypes showing differential tolerance towards Chilo partellus infestation. The central whorl leaves and stems of the infested maize genotypes were collected at seven days interval from the day of infestation till 28 days of infestation. In general, the contents of phenolic compounds—total phenols, flavonols, o-dihydroxyphenols, tannins and the activities of phenylalanine ammonia lyase, tyrosine ammonia lyase, peroxidase and polyphenol oxidase were comparatively higher in the tolerant genotypes (PMH 3 and CM 500) as compared to the susceptible ones (PMH 1 and CM 139). The α-amylase inhibitor activity was higher in the central whorl leaves and stems of PMH 3 against both salivary and gut α-amylases of Chilo partellus, under control and infested conditions. It may be concluded that the higher content of phenolic compounds, induced activities of the phenol metabolizing enzymes and the high α-amylase inhibitor activity of tolerant genotypes against both salivary and gut α-amylases might be responsible for inducing resistance against Chilo partellus infestation.

本研究旨在确定玉米基因型中酚类代谢和α-淀粉酶抑制剂的状态，这些基因型对Chilo partellus侵染具有不同的耐受性。从侵染之日到侵染28天，每隔7天收集受侵染的玉米基因型的中心轮生叶和茎。一般而言，耐受基因型（PMH 3 和 CM 500）的酚类化合物总酚、黄酮醇、邻二羟基酚、单宁的含量以及苯丙氨酸解氨酶、酪氨酸解氨酶、过氧化物酶和多酚氧化酶的活性相对较高，如与易感人群（PMH 1 和 CM 139）相比。α-淀粉酶抑制剂活性在 PMH 3 的中央轮叶和茎中对唾液和肠道 α-淀粉酶的活性较高。Chilo partellus，在控制和感染的条件下。可以得出结论，酚类化合物的较高含量、酚代谢酶的诱导活性以及耐受基因型对唾液和肠道 α-淀粉酶的高 α-淀粉酶抑制剂活性可能是诱导对Chilo partellus侵染的抵抗力的原因。