Stress tolerance in a polyextremophile: the southernmost insect
Since biotic interactions within the simple terrestrial communities on the Antarctic Peninsula are limited compared with tropical and temperate regions, survival is largely dictated by the numerous abiotic challenges. Our research focuses on adaptations to environmental stresses experienced by the A...
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crcansciencepubl:10.1139/cjz-2014-0147 2023-12-17T10:21:29+01:00 Stress tolerance in a polyextremophile: the southernmost insect Lee, R.E. Denlinger, D.L. 2015 http://dx.doi.org/10.1139/cjz-2014-0147 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjz-2014-0147 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjz-2014-0147 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Zoology volume 93, issue 9, page 679-686 ISSN 0008-4301 1480-3283 Animal Science and Zoology Ecology, Evolution, Behavior and Systematics journal-article 2015 crcansciencepubl https://doi.org/10.1139/cjz-2014-0147 2023-11-19T13:39:26Z Since biotic interactions within the simple terrestrial communities on the Antarctic Peninsula are limited compared with tropical and temperate regions, survival is largely dictated by the numerous abiotic challenges. Our research focuses on adaptations to environmental stresses experienced by the Antarctic midge (Belgica antarctica Jacobs, 1900), the southernmost free-living insect. Midge larvae can survive freezing and anoxia year-round. Not only can frozen larvae undergo rapid cold-hardening (RCH) at temperatures as low as –12 °C, but RCH develops more rapidly in frozen compared with supercooled larvae. Whether larvae overwinter in a frozen state or cryoprotectively dehydrated may depend on hydration levels within their hibernacula. Larvae constitutively up-regulate genes encoding heat shock proteins, as well as the antioxidant enzymes superoxide dismutase and catalase. Larvae accumulate osmoprotectants in response to freezing, desiccation, and exposure to seawater; exposure to one of these osmotic stressors confers cross-tolerance to the others. Molecular responses to dehydration stress include extensive genome-wide changes that include differential expression of aquaporins among tissues, upregulation of pathways associated with autophagy, inhibition of apoptosis, and downregulation of metabolism and ATP production. Article in Journal/Newspaper Antarc* Antarctic Antarctic midge Antarctic Peninsula Antarctica Belgica antarctica Canadian Science Publishing (via Crossref) Antarctic The Antarctic Antarctic Peninsula Canadian Journal of Zoology 93 9 679 686 |
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Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Lee, R.E. Denlinger, D.L. Stress tolerance in a polyextremophile: the southernmost insect |
topic_facet |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
description |
Since biotic interactions within the simple terrestrial communities on the Antarctic Peninsula are limited compared with tropical and temperate regions, survival is largely dictated by the numerous abiotic challenges. Our research focuses on adaptations to environmental stresses experienced by the Antarctic midge (Belgica antarctica Jacobs, 1900), the southernmost free-living insect. Midge larvae can survive freezing and anoxia year-round. Not only can frozen larvae undergo rapid cold-hardening (RCH) at temperatures as low as –12 °C, but RCH develops more rapidly in frozen compared with supercooled larvae. Whether larvae overwinter in a frozen state or cryoprotectively dehydrated may depend on hydration levels within their hibernacula. Larvae constitutively up-regulate genes encoding heat shock proteins, as well as the antioxidant enzymes superoxide dismutase and catalase. Larvae accumulate osmoprotectants in response to freezing, desiccation, and exposure to seawater; exposure to one of these osmotic stressors confers cross-tolerance to the others. Molecular responses to dehydration stress include extensive genome-wide changes that include differential expression of aquaporins among tissues, upregulation of pathways associated with autophagy, inhibition of apoptosis, and downregulation of metabolism and ATP production. |
format |
Article in Journal/Newspaper |
author |
Lee, R.E. Denlinger, D.L. |
author_facet |
Lee, R.E. Denlinger, D.L. |
author_sort |
Lee, R.E. |
title |
Stress tolerance in a polyextremophile: the southernmost insect |
title_short |
Stress tolerance in a polyextremophile: the southernmost insect |
title_full |
Stress tolerance in a polyextremophile: the southernmost insect |
title_fullStr |
Stress tolerance in a polyextremophile: the southernmost insect |
title_full_unstemmed |
Stress tolerance in a polyextremophile: the southernmost insect |
title_sort |
stress tolerance in a polyextremophile: the southernmost insect |
publisher |
Canadian Science Publishing |
publishDate |
2015 |
url |
http://dx.doi.org/10.1139/cjz-2014-0147 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjz-2014-0147 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjz-2014-0147 |
geographic |
Antarctic The Antarctic Antarctic Peninsula |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula |
genre |
Antarc* Antarctic Antarctic midge Antarctic Peninsula Antarctica Belgica antarctica |
genre_facet |
Antarc* Antarctic Antarctic midge Antarctic Peninsula Antarctica Belgica antarctica |
op_source |
Canadian Journal of Zoology volume 93, issue 9, page 679-686 ISSN 0008-4301 1480-3283 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/cjz-2014-0147 |
container_title |
Canadian Journal of Zoology |
container_volume |
93 |
container_issue |
9 |
container_start_page |
679 |
op_container_end_page |
686 |
_version_ |
1785535010350039040 |