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Your Position :Home->Past Journals Catalog->2010年47 No.5

Impacts of elevated CO2 on the larvae of stem borer Chilo suppressalis fed on transgenic Bt rice
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Key Words:double CO2 level, Chilo suppressalis, transgenic Bt rice, metabolism enzymes, protective enzyme
Abstract:         The effects of double-atmospheric CO2 (750 vs. 375 μL/L) on the metabolic enzyme acetylcholinesterase (AChE) and the three protective enzymes, superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT), were investigated on stem borer Chilo suppressalis (Walker) larvae as these fed on transgenic Bt rice (cv. KMD expressing pure Cry1Ab) and nontransgenic rice (cv. XSD; i.e., the parental line) in open-top chambers. The results indicate that: (1) Increased CO2 levels significantly reduced AChE activity in larvae feeding on both transgenic Bt rice or nontransgenic rice. (2) Elevated CO2 and Bt rice both markedly enhanced the activities of POD and SOD. POD activity decreased sharply but SOD activity increased only initially. An obvious increase in CAT activity was observed initially but this declined after a period. (3) There were significant interactive effects between CO2 level, rice variety and sampling time. It appears that C. suppreddalis can alleviate some short-term adverse effects of elevated CO2 and transgenic Bt rice through physiological regulation using metabolic and protective enzymes. However, this regulatory mechanism can be suppressed by environmental factors, which can thereby reduce population performance.
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