摘要： 以草酸，KCl，FeSO₄，k₂HPO₄作为激发子，就诱导马铃薯块茎对早疫病的抗性及其机理进行了初步研究。结果表明，草酸，KCl，FeSO₄均可诱导马铃薯块茎产生对早疫病的抗性，其中20mmol/L草酸的保护率达到49.38%，80mmol/LKCl的保护率达到2.94%，40mmol/L FeSO₄的保护率达到1.1%，k₂HPO₄不能诱导马铃薯块茎抗早疫病。经草酸、KCl、FeSO₄诱导处理后的马铃薯块茎中，POD，PAL，PPO的活性明显高于对照，表明化学物质可能通过提高这3种酶的活性来发挥其诱导抗病作用。

关键词: 化学激发子, 马铃薯早疫病, 过氧化物酶, 苯丙氨酸解氨酶, 多酚氧化酶

Abstract: Oxalic acid,potassium chloride (KCl),ferrous sulfate (FeSO₄) and dipotassium hydrogen phosphate (k₂HPO₄) were used to induce resistance in potato tubers(Solarium tuberosum L.) against early blight,respectively.The results were as follows:oxalic acid,KCl,and FeSO₄ were effective elicitors of inducing resistance in potato tubers against early blight,but k₂HPO₄ could not do that.Preliminary research on the induced resistance mechanisms showed that the activities of POD,PPO,PAL in potato tubers were enhanced by oxalic acid,KCl,and FeSO₄,while they couldn't inhibit the growth of Alternaria solani in vitro.

Key words: Chemical, elicitor, Potato, early, blight POD, PAL PPO

中图分类号: 

• S436.32