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    Expressional divergence of insect GOX genes: From specialist to generalist glucose oxidase

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    Name:
    GOX+manuscript+revision+for+IB ...
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    Description:
    Final Accepted Manuscript
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    Author
    Yang, Lihong cc
    Wang, Xiongya
    Bai, Sufen
    Li, Xin
    Gu, Shaohua
    Wang, Chen-Zhu
    Li, Xianchun
    Affiliation
    Univ Arizona, Dept Entomol
    Issue Date
    2017-07
    Keywords
    Helicoverpa spp.
    GOX expression
    Host plant range
    Post-transcriptional regulation
    Translation
    RNA stability
    P:C ratio
    Allelochemicals
    
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    Publisher
    Elsevier
    Citation
    Expressional divergence of insect GOX genes: From specialist to generalist glucose oxidase 2017, 100:21 Journal of Insect Physiology
    Journal
    Journal of Insect Physiology
    Rights
    © 2017 Elsevier Ltd. All rights reserved.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    Insect herbivores often secrete glucose oxidase (GOX) onto plants to counteract plant defenses and potential pathogens. Whether generalist herbivores always have significantly higher GOX activities than their specialist counterparts at any comparable stage or conditions and how this is realized remain unknown. To address these two general questions, we subjected larvae of a pair of sister species differed mainly in host range, the generalist Helicoverpa armigera and its specialist counterpart Helicoverpa assulta, to the same sets of stage, protein to digestible carbohydrate (P:C) ratio, allelochemical or host plant treatments for simultaneous analyses of GOX transcripts and activities in their labial glands. GOX activity and transcripts are upregulated concurrently with food ingestion and body growth, downregulated with stopping ingestion and wandering for pupation in both species. The three tested host plants upregulated GOX transcripts, and to a lesser extent, GOX activity in both species. There were significant differences in both GOX transcripts and activity elicited by allelochemicals, but only in GOX transcripts by P:C ratios in both species. GOX activities were higher in H. armigera than H. assulta in all the comparable treatments, but GOX transcripts were significantly higher either in generalists or in specialists, depending on the developmental stages, host plants, P:C ratio and allelochemicals they encounter. These data indicate that the greater GOX activity in generalist herbivores is not achieved by greater transcription rate, but by greater transcript stability, greater translation rate, better enzyme stability and/or their combination.
    Note
    12 month embargo; Published online 13 May 2017.
    ISSN
    00221910
    DOI
    10.1016/j.jinsphys.2017.05.003
    Version
    Final accepted manuscript
    Sponsors
    USDA National Institute of Food and Agriculture [ARZT-1360890-H31-164, ARZT-1370400-R31-168]; National Natural Science Foundation of China [31171874, 31321004]; State Key Laboratory for Biology and of Plant Diseases and Insects [SKLOF201402, SKLOF201504]
    Additional Links
    http://linkinghub.elsevier.com/retrieve/pii/S0022191016304450
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.jinsphys.2017.05.003
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