HanBauce1995

Référence

Han, E.N. and Bauce, E. (1995) Non-Freeze Survival of Spruce Budworm Larvae, Choristoneura-Fumiferana, at Subzero Temperatures during Diapause. Entomologia Experimentalis et Applicata, 75(1):67-74.

Résumé

Spruce budworm larvae, Choristoneura fumiferana (Clem.) (Lepidoptera: Tortricidae), in early-, mid- and late-diapause (maintained at 2 degrees C), were exposed to various sub-zero temperatures, above the supercooling point, for different periods to determine the insect's cold-hardiness in terms of non-freeze survival. Larvae which were in the middle of diapause showed the highest survival (percentage of larvae emerging from hibernacula after diapause), followed by larvae in late- and early-diapause respectively. When exposed to -23 degrees C, larvae which were acclimatized to outside air temperatures had a much higher survival than the larvae maintained at 2 degrees C. This survival was correlated with a glycerol content that was ten times higher and a depressed supercooling point in acclimatized larvae compared to lab-maintained larvae. Experiments also demonstrated that mortality of the larvae maintained in an extended supercooled state at -23 degrees C was due to cold injury rather than freezing. The present study supports the hypothesis that glycerol may have a cryoprotective role other than depressing the supercooling point in freeze-intolerant insects and highlights the importance of investigating non-freeze mortality during insect diapause.

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@ARTICLE { HanBauce1995,
    AUTHOR = { Han, E.N. and Bauce, E. },
    TITLE = { Non-Freeze Survival of Spruce Budworm Larvae, Choristoneura-Fumiferana, at Subzero Temperatures during Diapause },
    JOURNAL = { Entomologia Experimentalis et Applicata },
    YEAR = { 1995 },
    VOLUME = { 75 },
    PAGES = { 67-74 },
    NUMBER = { 1 },
    NOTE = { Qy176 Times Cited:5 Cited References Count:32 },
    ABSTRACT = { Spruce budworm larvae, Choristoneura fumiferana (Clem.) (Lepidoptera: Tortricidae), in early-, mid- and late-diapause (maintained at 2 degrees C), were exposed to various sub-zero temperatures, above the supercooling point, for different periods to determine the insect's cold-hardiness in terms of non-freeze survival. Larvae which were in the middle of diapause showed the highest survival (percentage of larvae emerging from hibernacula after diapause), followed by larvae in late- and early-diapause respectively. When exposed to -23 degrees C, larvae which were acclimatized to outside air temperatures had a much higher survival than the larvae maintained at 2 degrees C. This survival was correlated with a glycerol content that was ten times higher and a depressed supercooling point in acclimatized larvae compared to lab-maintained larvae. Experiments also demonstrated that mortality of the larvae maintained in an extended supercooled state at -23 degrees C was due to cold injury rather than freezing. The present study supports the hypothesis that glycerol may have a cryoprotective role other than depressing the supercooling point in freeze-intolerant insects and highlights the importance of investigating non-freeze mortality during insect diapause. },
    KEYWORDS = { cold-hardness cold injury glycerol acclimatization dipause spruce budworm lepidoptera tortricidae insect cold hardiness protein stabilization lepidoptera glycerol mortality tolerance noctuidae beetle winter },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.05 },
}

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