(扬州大学园艺与植物保护学院扬州225009)摘要以分蘖期水稻协优963、TN1为供试材料，研究褐飞虱Nilaparvata lugens (Stl) 侵害后水稻叶片、根超氧化物歧化酶(SOD) 活性、丙二醛(MDA)含量变化情况。结果表明：协优963、TN1叶片SOD活性变化不明显；15和30头/株侵害协优963后3、6、9 d根SOD活性分别显著下降了884%和772%、868%和705%、513%和197%；15和30头/株侵害TN1后3 d根SOD活性显著下降了714%和894%，30头/株侵害TN1后6、9 d根SOD活性显著下降了503%和701%。协优963、TN1叶片MDA含量变化不明显；30头/株侵害协优963后3 d根MDA含量显著上升了1194%，9 d 15头/株侵害后根MDA含量显著上升了3697%；15、30头/株侵害TN1后3、6、9 d根MDA含量分别显著下降了924%和879%、760%和540%、724%和982%。由此可见，褐飞虱侵害2水稻品种后根、叶片变化不同，叶片变化不明显，根SOD活性显著下降；2水稻品种根MDA含量变化稍有不同，协优963根MDA含量显著上升，TN1根MDA含量显著下降。
关键词褐飞虱， 水稻， SOD活性， MDA含量

Effects of Nilaparvata lugens (Stl) infestation on SOD activities and
Malondialdehyde contents in leaves and roots of rice LIU JingLan**YANG XiaWU JinCai***
(School of Horticulture and Plant Protection, Yangzhou University, Yangzhou225009, China)

AbstractChanges in SOD activity and Malondialdehyde (MDA) content in the leaves and roots of the rice varieties Xie you 963 and TN1 infested by Nilaparvata lugens (Stl) were investigated at the tillering stage. SOD activity in the leaves of Xie you 963 and TN1 did not significantly decrease at infestation levels of 15 and 30 nymphs / plant. However, SOD activities in the roots of Xie you 963 decreased significantly after 3, 6 and 9 d at infestation levels of 15 and 30 nymphs / plant SOD activity in the roots of TN1 infested by 15 and 30 nymphs / plant decreased significantly after 3 d. SOD activities in roots decreased significantly after 6 and 9 d when infested by 30 nymphs / plant. The MDA content of the leaves of Xie you 963 and TN1 showed no significant change at infestation level of 15 and 30 nymphs / plant. However, an infestation level of 30 nymphs / plant caused a 119.4% increase in the MDA content of the roots of Xie you 963 after 3 d, while an infestation level of 15 nymphs / plant caused an increase of 369.7% after 9d. The MDA content of the roots of TN1 plants infested by 15 and 30 nymphs / plant decreased after 3, 6 and 9 d. These results showed that changes in SOD activity and MDA content under different levels of N. lugens infestation varied with rice organ (roots or leaves). Roots were more sensitive than leaves; although SOD activity and MDA content of the leaves of both cultivars did not change significantly, SOD activity in the roots of both cultivars significantly decreased whereas MDA content in the roots of Xie you 963 significantly increased and that of TN1 significantly decreased.
Key wordsNilaparvata lugens, rice, SOD activities, MDA contents