Issue:ISSN 2095-1353
CN 11-6020/Q
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2012年49 No.6
Effects of Nilaparvata lugens infestation on gibberellinlevels of rice at the grain-filling stage
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Key Words： rice，grain-filling stage，Nilaparvata lugens，gibberellin contents
Abstract： 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．