Transgenic ice nucleation-active Enterobacter cloacae reduces cold hardiness of corn borer and cotton bollworm larvae

文献类型： 外文期刊

第一作者： Tang, CR

作者： Tang, CR;Sun, FZ;Zhang, XJ;Zhao, TC;Qi, JY

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关键词： transgenic INA En. cloacae;biological control;SCP;gut colonization;corn borer and cotton bollworm;epiphytic fitness;BIOLOGICAL-CONTROL;BACTERIA;INSECTS;CHRYSOMELIDAE;COLEOPTERA;TOLERANCE;FREEZE;BEETLE;GENE

期刊名称：FEMS MICROBIOLOGY ECOLOGY （ 影响因子：4.194； 五年影响因子：5.137 ）

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收录情况： SCI

摘要： The ice nucleation (IN) gene iceA of Erwinia ananas 110 was integrated into the chromosomes of two Enterobacter cloacae strains (Enc 1.2022 and Enc 1.181). These two newly derived transgenic strains. designated Enc2022-1 and Enc181-1, respectively, possessed ice nucleation activity at -2.5 degreesC, significantly higher than their parent strains (active at approx -10 degreesC or lower). After ingesting these transgenic bacteria, the mean supercooling points (SCPs) of corn borer and cotton bollworm larvae were -3 to -4 degreesC. significantly higher than those Of untreated controls. The SCPs remained significantly elevated over the 9-day period after ingestion. which matched well with the efficient gut colonization of the bacteria during this period. All treated larvae froze and eventually died after exposure for 6 h to a temperature of -7 degreesC. and more than 95% died after 12 h at -5 degreesC. In contrast. few or none of the untreated control larvae froze and died under the same conditions. Furthermore, the growth ability of these transgenic ice nucleation-active (INA) En. cloacae strains on corn leaves was reduced, compared to that of wild-type epiphytic E. ananas. as revealed by pot tests conducted in both greenhouse and Outdoor conditions. The stable colonization in insect guts and their lower affinity, to plants Would make these transgenic INA bacteria useful as a novel tool for biological control of insect pests in agricultural fields. (C) 2004 Federation of European Microbiological Societies. Published by Elsevier B.V. All rights reserved.

分类号： Q93

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