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用水杨酸、磷酸氢二钾、灰斑病菌滤液和草酸作诱抗剂 ,研究了玉米对灰斑病的诱导抗病作用 ,同时测定了挑战接种前后的PAL酶活性的变化。结果表明 :上述4种诱抗剂均有不同程度的诱导抗病性 ,其中水杨酸诱抗效果最好 ,病菌培养滤液和磷酸氢二钾次之 ,草酸诱抗效果最差。诱导后挑战接种 ,PAL酶活性变化都有增加 ,且酶活性曲线波形变化较大
Salicylic acid, dipotassium hydrogen phosphate, gray leaf spot bacteria filtrate and oxalic acid as the inducer were used to study the effect of maize on leaf spot resistance and the changes of PAL enzyme activity before and after challenge inoculation. The results showed that the above four kinds of inducers all induced disease resistance in varying degrees, of which salicylic acid inducing effect was the best, bacterial culture filtrate and dipotassium hydrogen phosphate followed, and oxalic acid inducing effect was the worst. After inoculation challenge induction, PAL enzyme activity changes have increased, and the enzyme activity curve waveforms larger