Abstract
We identify and characterize 14 small heat-shock protein (sHSP) genes from the diamondback moth (DBM), Plutella xylostella (L.), a destructive pest. Phylogenetic analyses indicate that, except for sHSP18.8 and sHSP19.22, the other 12 DBM sHSPs belong to five known insect sHSP groups. Developmental expression analysis revealed that most sHSPs peaked in the pupal and adult stages. The transcripts of sHSPs display tissue specificity with two exhibiting constitutive expression in four tested tissues. Expression of sHSP18.8 in fourth instar larvae is not induced by the tested abiotic stressors, and unless sHSP21.8 is not sensitive to thermal stress, 12 sHSPs are significantly up-regulated. The messenger RNA (mRNA) levels of all sHSPs are reduced under oxidative stress. Food deprivation leads to significant down-regulation of three sHSPs. The majority of sHSPs show expression variation to various heavy metals, whereas mRNA abundances of sHSP22.1 and sHSP 28.9 are reduced by four heavy metals. The responses of sHSPs to indoxacarb and cantharidin are varied. Beta-cypermethrin and chlorfenapyr exposure results in an increase of 13 sHSP transcripts and a reduction of 12 sHSP transcripts, respectively. These results show that different sHSPs might play distinct roles in the development and regulation of physiological activities, as well as in response to various abiotic stresses of DBM.
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Acknowledgments
We sincerely thank Prof. John Richard Schrock (Emporia State University, USA) for revising the manuscript. This research is supported by the Special Fund for the Public Interest (Agriculture) (200903052) by The Ministry of Science and Technology and The Ministry of Agriculture of China and the ‘13115’ Sci-Tech Innovation Project of Shaanxi Province (2007ZDKG-14).
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Chen, X., Zhang, Y. Identification of multiple small heat-shock protein genes in Plutella xylostella (L.) and their expression profiles in response to abiotic stresses. Cell Stress and Chaperones 20, 23–35 (2015). https://doi.org/10.1007/s12192-014-0522-7
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DOI: https://doi.org/10.1007/s12192-014-0522-7