Journal
PEERJ
Volume 5, Issue -, Pages -Publisher
PEERJ INC
DOI: 10.7717/peerj.3284
Keywords
Bark beetle; Mountain pine beetle; Overwintering; Glycerol; Seasonal; Cyroprotectant; Freeze intolerant; Dendroctonus ponderosae; Coleoptera; Curculionidae
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Funding
- Genome Canada
- Genome British Columbia
- Genome Alberta
- Canada Research Chairs program (DPWH)
- Canada Foundation for Innovation (DPWH)
- Natural Sciences and Engineering Research Council of Canada (DPWH)
- British Columbia Knowledge Development Fund (DPWH)
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Winter mortality is a major factor regulating population size of the mountain pine beetle, De ndroctonusponderosae Hopkins (Coleoptera: Curculionidae). Glycerol is the major cryoprotectant in this freeze intolerant insect. We report findings from a gene expression study on an overwintering mountain pine beetle population over the course of 35 weeks. mRNA transcript levels suggest glycerol production in the mountain pine beetle occurs through glycogenolytic, gluconeogenic and potentially glyceroneogenic pathways, but not from metabolism of lipids. A two-week lag period between fall glycogen phosphorylase transcript and phosphoenolpyruvate carboxykinase transcript up-regulation suggests that gluconeogenesis serves as a secondary glycerol-production process, subsequent to exhaustion of the primary glycogenolytic source. These results provide a first look at the details of seasonal gene expression related to the production of glycerol in the mountain pine beetle.
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