虫害对不同水分条件胡杨披针形叶活性氧代谢的影响

Effect of insect pest on activated oxygen metabolism in lanceolate leaves of Populus euphratica under different water condition

在不同土壤水分条件下 ,研究了胡杨披针形叶叶片遭受虫害胁迫时活性氧释放和抗氧化酶活性的变化 .结果表明 ,单纯的土壤水分亏缺并不导致O-2 · 、H2 O2 的释放增加以及SOD、CAT活性上升 ;但土壤水分亏缺条件下的虫害胁迫却导致胡杨披针形叶叶片O-2· 、H2 O2 的释放增加 ,SOD、CAT活性上升 .在人工灌溉生境下 ,虫害胁迫却使二者均呈下降趋势 .可以认为 ,土壤水分亏缺条件下的虫害胁迫是造成胡杨枯死亡的主要原因之一 .

This paper studied the effect of insect pest on the activities of protective enzymes SOD and CAT and the contents of H 2O 2 and O - 2· in lanceolate leaves of Populus euphratica under different soil water conditions.The results showed that soil water deficiency did not increase SOD and CAT activities and H 2O 2 and O - 2· contents in lanceolate leaves,but under this condition,insect pest increased them.When soil water was abundance,insect pest couldn't increase the activities of SOD and CAT and the contents of H 2O 2 and O - 2· in lanceolate leaves.It's concluded that insect pest had an important role in death of Populus euphratica under soil water deficiency.