不同抗黑胚病小麦品种接菌后几种酶活性变化

Analysis of Enzyme Activity in Wheat Varieties after Inoculation with Alternaria alternate

研究了接种链格孢菌前后抗、感黑胚病的小麦品种(各3个)小穗内与抗性反应有关的SOD、POD、PPO 3种酶活性的动态变化。接菌后,抗病品种SOD酶活性第2天达最大峰值;感病品种豫农9901的SOD最大值在第5天出现,豫麦57号和中育6号的SOD最大值在接菌后第4天出现,且酶活性低于抗病品种。对POD活性测定发现,在3个抗病品种中,豫优1号接菌后POD活性迅速攀升,直至第3天达最大峰值后迅速下降,国优1号和豫麦47号的POD活性均迅速升高,在接菌后1 d达最大峰值,到第3天第2次出现峰值,但没有第1次活性强。感病品种POD酶活性变化迟缓,豫麦57号在第3天POD活性最高,豫农9901和中育6号POD活性在第4天达到最大峰值,但没有抗病品种POD活性水平高。PPO活性测定结果显示,接菌后抗病品种PPO活性迅速上升,在第1天达到最大值,第5天活性再次增强,但没有第1天活性强;感病品种接菌后2d变化不大,2d之后PPO活性急剧上升,并在第4天上升至最大,此后逐渐减弱。以上结果说明,SOD、POD、PPO 3种酶在植物抗病机制中起着重要作用。

The changes in the activities of some enzymes in six wheat cultivars with different resistance to black point were studied after inoculation with Alternaria alternate. The result showed that the activities of superoxide dismutase （SOD）, peroxidase （POD） and poly-phonoloxidase （PPO） in resistant and susceptible cultivars had all increased at the first stage of inoculation but then decreased. The range of the changes in resistant cultivars was larger than those in the susceptible, indicating that these three kinds of enzymes play important roles in wheat resistance to the disease and their regulation ability in resistant cultivars is stronger than that in susceptible ones.