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Chinese Journal of Applied Ecology ›› 2001, Vol. ›› Issue (3): 409-413.

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Stress response of Nilaparvata lugens at high temperature and activities of its protective enzyme systems

FENG Congjing, DAI Huaguo, WU Shuwen   

  1. Department of Plant Protection, Nanjing Agricultural University, Nanjing 210095
  • Received:1999-09-27 Revised:2000-03-16 Online:2001-05-25

Abstract: The nymphae and different wing form adults of Brown Planthopper (BPH) were treated intermittently at 34℃,36℃and 38℃.During the process of heat shock treatment,the variation of the activities of the endogenous enzymes of protective system and the content of lipid peroxides (LPO) in BPH were researched.The results showed that the effect of heat shock treatments on CAT activity in 4th instar of nymphae was higher than that in 3rd and 5th instar.The CAT activity in BPH adults increased with the day age,and 36℃ was the suitable temperature at which H 2O 2 was scavenged by CAT.The GSH px activity was higher in old than that in young nymphae,and the ability of GSH px to scavenge H 2O 2 was higher in old adults than in those adults emerged early.The activity of SOD had a positive correlation with the treated temperatures,and decreased with the increase of nymphae instar and the day age of adults after emergence at the same temperature.The activities of CAT,GSH px,and SOD in macropterous adults were higher than those in brachypterous adults.There were no significant difference for the activities of CAT,GSH px and SOD between female and male adults (α>0.05).The content of LPO in BPH increased with the rise of treated temperature,and also increased with the increase of instars in nymphae and day age after emergence in adults at the same temperature.The LPO content was higher in brachypterous than in macropterous adults.

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