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2012年49 No.6
Effect of host plants on cold-hardiness of 3rd instar larvae of thebeet armyworm，Spodoptera exigua
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Key Words： Spodoptera exigua，host plant，cold hardiness，supercooling capacity，cryoprotectants
Abstract： Host plant selection is one of the important factors affecting the cold-hardiness ofinsectsSupercooling capacity and cryoprotectant effects of feeding on pakchoi，cabbage，shallot and spinach under differenttemperatureconditions were studied in 3rd instar larvae of the beet armyworm，Spodoptera exigua ( Hübner ) ( Lepidoptera:Noctuidae) ． The results indicated that the host plant significantly influences supercooling capacity，with 3rd instar larvaefed on cabbage having the lowest supercooling pointSupercooling point，freezing point and body water content weresignificantly affected by the interaction between host plant and temperature． Although glycerol and glycogen contentshowed little variationbetween the experimental groups，trehalose content was significantly affected by both host plant species and the interaction between host plants and temperature． Trehalose and glycogen levels in 3rd instar larvae fed on different host plants displayed opposite trends with increasing temperature，and we consider that the trehalose wasincreased by conversion from glycogen． Our results suggest that appropriate host plant selection can improve overwintering ability of young S． exigua larvae．