干旱与条锈病复合胁迫对小麦的生理影响

以抗旱性和抗病性不同的小麦为材料，以正常生长为对照，观察了病原菌和水分复合胁迫对小麦叶片相对含水量、活性氧代谢以及对抗氰呼吸的发生、运行的影响。讨论了在干旱与病原菌侵染复合胁迫下，抗氰呼吸在植物抗逆机制中所扮演的角色。复合胁迫下，抗病小麦显然具备更强的水分调控能力，而感病品种不能有效控制病叶水分散失。水分胁迫能引起抗氰呼吸的下降，但不能抵消因病原菌侵染引起的抗氰呼吸的增强，条锈菌侵染对小麦抗氰呼吸的影响远远大于水分胁迫。病原菌侵染和水分复合胁迫下，活性氧产生的速率表现出累加效应，而抗氰呼吸表现出和基质抗氧化酶的活性互补。植物交替氧化酶在干旱与病原菌侵染复合胁迫中具有重要的抗氧化功能，并可能调节着逆境下物质与能量需求间的矛盾。

Combined effect of water stress and pathogen infection on wheat

Relative water content(RWC),operation and development of alternative pathway,the changes in active oxygen species(AOS) and activities of antioxidant enzymes,and the role of alternative pathway participating in the protection mechanism against environment stress were studied and discussed in wheat seedlings leaves under combined intimidation of water stress and pathogen infection.Experiments showed that the disease-resistant cultivars had more powerful ability to regulate moisture content than the disease-susceptible cultivars under combined intimidation of water stress and pathogen infection.The effects of stripe rust on cyanide-resistant respiration were very larger than that of water stress. The decrease in cyanide-resistant respiration caused by water stress couldn't counteract the increasing cyanide-resistant respiration aroused by stripe rust infecting.Combined intimidation resulted in AOS accumulation,and cyanide-resistant respiration and the activities of antioxidant enzymes presented upon the completion of lowing AOS production,to some extent.It was proposed that cyanide-resistant respiration participates in the anti-oxidation mechanisms and regulate the ambivalence and balance of requirement of the energy and substance for combined intimidation conditions.