灌浆期水稻受褐飞虱侵害后赤霉素含量的变化
Effects of Nilaparvata lugens infestation on gibberellinlevels of rice at the grain-filling stage
刘井兰 杨霞 吴进才
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作者单位：扬州大学园艺与植物保护学院扬州225009
中文关键词：水稻，灌浆期，褐飞虱，赤霉素含量
英文关键词： rice，grain-filling stage，Nilaparvata lugens，gibberellin contents
中文摘要： 应用酶联免疫吸附法(ELISA)研究灌浆期水稻协优963、TN1 受褐飞虱Nilaparvata lugens ( Stal)若虫侵害
后根、叶片赤霉素( gibberellin，GA)含量的变化，以探讨褐飞虱若虫侵害后灌浆期水稻耐虫性与植物体内源激素
的关系。结果表明:虫口密度40 头/株和80 头/株120 头/株侵害灌浆期水稻协优963 后3 d 根GA 含量显著下
降，40 头/株和80 头/株侵害后协优963 后3 d 根冠(叶片)比显著下降;40 头/株侵害协优963 后6 d 根冠比显著
下降。40 头/株、80 头/株和120 头/株侵害灌浆期水稻TN1 后3 d 根GA 含量显著下降;80 头/株和120 头/株侵
害TN1 后6 d 根GA 含量显著下降，120 头/株侵害TN1 后6 d 根冠比显著下降。表明灌浆期水稻协优963、TN1 受
褐飞虱若虫侵害后基本变化趋势为根GA 含量、GA 含量根冠比下降(3 d、6 d)，叶片GA 含量变化规律不明显;耐、
感虫水稻品种变化一致，变化幅度无明显差异。
英文摘要： To understand the relationship between tolerance and endogenous plant hormones in rice plants infested withNilaparvata lugens ( Stal ) at the grain-filling stage，change in gibberellin ( GA ) in the roots and leaves of tworepresentative rice varieties in response to N． lugens nymph infestation was studied using enzyme-linked immunosorbentassay (ELISA) ． The results indicate that GA content in the roots of the Xieyou 963 variety，and the ratio of GA contentsin roots to that in leaves ( R /L ratio)，decreased significantly after 3 d，and the R /L ratio also decreased significantlyafter 6 d． The GA content of the roots of the TN1variety also decreased significantly after 3 d and 6 d and the R /L ratiodecreased after 6 d． These results show that the GA content of roots and the R /L ratio of both tolerant and susceptible ricevarieties decreased at 3 d and 6 d after N． lugens infestation during the grain-filling stage． The GA content of leaves didnot，however，change significantly． So the two rice varieties had the same change law，no significant difference．