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Scientia Silvae Sinicae ›› 2019, Vol. 55 ›› Issue (2): 128-136.doi: 10.11707/j.1001-7488.20190213

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Effects of Insecticides and Ultraviolet on the Expression of sHSP12.2 Gene in Chouioia cunea

Fan Weijian1, Xiang Weifang1, Wang Jing2, Bai Penghua3, Pan Lina1, Yang Yixin1, Zhu Gengping1, Li Min1   

  1. 1. Tianjin City Key Laboratory of Plant and Animal Resistant College of Life Science, Tianjin Normal University Tianjin 300387;
    2. Luohe City Yuzhongnan Breeding and Research Center for Forest Pest's Natural Enemy, Henan Province Luohe 462300;
    3. Institute of Plant Protection, Tianjin Academy of Agricultural Sciences Tianjin 300384
  • Received:2017-05-02 Revised:2018-10-16 Online:2019-02-25 Published:2019-03-20

Abstract: [Objective] This study aimed to study the role of small heat shock protein (sHSP) in parasitoids and explore the resistance of the heat shock proteins from parasitic natural enemies to pesticides and ultraviolet stress.[Method] The small heat shock protein gene of Chouioia cunea(Ccshsp12.2) was cloned and was used for constructing a phylogenetic tree,calculating amino acid substitution rate and codon usage bias.The RT-qPCR technique was used to quantify the relative expression of Ccshsp12.2 under ultraviolet and treatments with four kinds of pesticides (Abamectin,Bacillus thuringiensis,chlorbenzuron and Beta-cypermethrin).[Result] The Ccshsp12.2 gene with complete ORF was obtained,encoding 206 amino acid with a molecular weight of 23.1 kDa.The phylogenetic trees showed two lineages,Ccshsp12.2 was clustered with other parasitoids in to one group,while Cephus cinctus was clustered with other independent Hymenoptera insects into the other.The average value of Ka/Ks (dN/dS) in 9 selected mRNA sequences is 0.674 067,which means that those genes appear to be primarily negatively selected.In addition,the average codon usage bias of parasite insect is 0.344,while it is 0.353 among independent insect.The result of RT-qPCR showed that Ccshsp12.2 was up-regulated by the effect of insecticides and ultraviolet independently.The relative expression of Ccshsp12.2 was 3.36-6.17 times higher than the control under the treatment of insecticides and ultraviolet A radiation.[Conclusion] The phylogenic result and molecular evolution analysis showed that Hymenoptera insects with different living style might suffer from different evolution stress.Ccshsp12.2 was induced in response to ultraviolet and 4 kinds of pesticides.The findings in this study would provide some clues for the investigation about the response of C.cunea to a biotic stresses and insight into the use of this parasitoid in biological control strategies.

Key words: Chouioia cunea, resistance, small heat shock protein 12.2, gene expression, insect

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