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Heat and starvation induced hormesis in longevity of Oomyzus sokolowskii (Kurdjumov) (Hymenoptera: Eulophidae) adult females

文献类型： 外文期刊

作者： Zhang, Juan 1 ; Huang, Jun 2 ; Hou, Jia-xiu 1 ; Xu, Deng-lan 1 ; Shi, Zu-hua 1 ;

作者机构： 1.Zhejiang Univ, Inst Insect Sci, Minist Agr, Key Lab Mol Biol Crop Pathogens & Insects, Hangzhou 310029, Zhejiang, Peoples R China

2.Zhejiang Acad Agr Sci, Flower Res & Dev Ctr, Hangzhou 311202, Zhejiang, Peoples R China

关键词： Oomyzus sokolowskii;Longevity;Hormesis;Thermal stress;Food deprivation;Plutella xylostella

期刊名称：JOURNAL OF THERMAL BIOLOGY （ 影响因子：2.902； 五年影响因子：3.102 ）

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收录情况： SCI

摘要： Oomyzus sokolowskii (Kurdjumov) (Hymenoptera: Eulophidae) is an important endoparasitoid of Plutella xylostella (Linnaeus) (Lepidoptera: Plutellidae) larvae and pupae. Previous studies have showed that environmental stress induced hormesis in a variety of organisms. In the present study, we investigated the effects of heat and starvation stress on the survival and induced hormesis in longevity of O. sokolowskii adult females under laboratory conditions. Results showed that temperature and exposure time significantly affected the survival rate of O. sokolowskii adult females with the extreme temperatures and/or longer durations proving to be more lethal. When O. sokolowskii adult females were heat-treated for 0.5, 1, 2, 4, and 8 h, LTemp50 were >50.00, 43.24, 38.82, 38.32, and 38.17 degrees C, respectively. LTime50 at the threshold temperature of 38 degrees C was 3.90 h. The sub-lethal temperature exposure for a certain time period reduced the survival numbers, but increased the longevity of survived adult females at the condition of starvation. The exposure for 2 h at 36 and 38 degrees C reduced the survival numbers by 26.67% and 46.67%, but extended the longevity of the survived adult females by 65.89% and 55.37% in comparison with those in the control, respectively. These results suggest O. sokolowskii adult female has the potential of thermal resistance, and its longevity will increase via heat and starvation treatment.Digital Object Identifier http://dx.doi.org/10.1016/j.jtherbio.2012.08.002

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