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Differential Susceptibility to High Temperature and Variation of Seasonal Occurrence between Spodoptera exigua and Plutella xylostella
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 Title & Authors
Differential Susceptibility to High Temperature and Variation of Seasonal Occurrence between Spodoptera exigua and Plutella xylostella
Kim, Minhyun; Lee, Seunghee; Kim, Yonggyun;
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Climate change has been regarded as one of main factors to change Korean insect pest fauna. Especially, a global warming model predicts to expand habitat for insect pests originated from tropical or subtropical regions. Two insect pests, the beet armyworm (Spodoptera exigua) and the diamondback moth (Plutella xylostella), are known to overwinter in some greenhouse conditions without diapause induction in Korea. There was a clear difference between these two insects in seasonal occurrence. P. xylostella occurred only at early spring and fall seasons, but did not occur during summer. In contrast, S. exigua maintained their occurrence from late spring to fall seasons. This study set up a hypothesis that the difference in the seasonal occurrence may be resulted from variation in susceptibility to high temperature. To test the hypothesis, heat tolerance was compared between these two insects. Exposure to for 40 min killed 100% individuals of P. xylostella larvae. However, most larvae of S. exigua survived in response to even for 80 min. Heat tolerance varied among developmental stages in both insects. Highest tolerant stages were instar larvae and adults for P. xylostella, but instar larvae for S. exigua. Pre-exposure to for 30 min significantly increased heat tolerance in both insects. Induction of heat tolerance accompanied with significant increase of glycerol contents in the hemolymph in both insects and up-regulation of three heat shock protein expressions in S. exigua. These results suggest that the differential susceptibility to high temperature explains the disappearance of P. xylostella during summer, at which S. exigua maintains its occurrence.
Heat tolerance;Spodoptera exigua;Plutella xylostella;Glycerol;Heat shock protein;
 Cited by
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