NDLI: Maintenance of the supercooled state in the gut fluid of overwintering pyrochroid beetle larvae, Dendroides canadensis : role of ice nucleators and antifreeze proteins

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Maintenance of the supercooled state in overwintering pyrochroid beetle larvae, Dendroides canadensis : role of hemolymph ice nucleators and antifreeze proteins

Maintenance of the supercooled state in the gut fluid of overwintering pyrochroid beetle larvae, Dendroides canadensis : role of ice nucleators and antifreeze proteins

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Journal of Comparative Physiology B : Volume 167, Issue 1, January 1997

Maintenance of the supercooled state in the gut fluid of overwintering pyrochroid beetle larvae, Dendroides canadensis : role of ice nucleators and antifreeze proteins

Content Provider	Springer Nature Link
Author	Olsen, T. M. Duman, J. G.
Copyright Year	1997
Abstract	The effect of gut fluid ice nucleators and antifreeze proteins on maintenance of supercooling was explored in fire-colored beetle larvae, Dendroides canadensis, via seasonal monitoring of supercooling points, antifreeze protein activity and ice nucleator activity of gut fluid and/or larvae. During cold hardening in the field, freeze-avoiding larvae evacuated their guts and depressed larval supercooling points. Analysis of gut fluid indicated supercooling points and ice nucleator activity decreased, whereas antifreeze protein activity increased as winter approached. Suspensions of bacteria isolated from guts of feeding larvae collected in spring/summer had higher supercooling points than those from midwinter-collected non-feeding larvae, suggesting bacterial ice nucleators are removed from midwinter gut fluid. The ice nucleation active bacterium Pseudomonas fluorescens was isolated from gut fluid of feeding larvae but was absent in winter. When mixed with purified D.␣canadensis hemolymph antifreeze proteins (structurally similar and/or identical to those in gut fluid), the cumulative ice nucleus spectra of P. fluorescens suspensions were shifted to lower temperatures indicating an inhibitory effect on the bacteria's ice-nucleating phenotype. By extending larval supercooling capacity, both gut clearing and masking of bacterial ice nucleators by antifreeze proteins may contribute to overwintering survival in supercooled insects.
Starting Page	114
Ending Page	122
Page Count	9
File Format	PDF
ISSN	01741578
Journal	Journal of Comparative Physiology B
Volume Number	167
Issue Number	2
e-ISSN	1432136X
Language	English
Publisher	Springer-Verlag
Publisher Date	1997-02-18
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Physiology Biochemistry Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Endocrinology

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Maintenance of the supercooled state in overwintering pyrochroid beetle larvae, Dendroides canadensis : role of hemolymph ice nucleators and antifreeze proteins

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Maintenance of the supercooled state in the gut fluid of overwintering pyrochroid beetle larvae, Dendroides canadensis : role of ice nucleators and antifreeze proteins

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