JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
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The Influence of Fatty Acids on Cold Hardiness of Eogystia hippophaecolus Larvae.

Cryo Letters 2018 May
BACKGROUND: Larvae of the Cossidae family moth Eogystia hippophaecolus bore into and overwinter in the roots of sea buckthorn, which damages this plant in China.

OBJECTIVE: The primary aims of the current study were to investigate the effects of fatty acids on cold hardness in overwintering larvae.

MATERIALS AND METHODS: The supercooling point (SCP), low temperature mortality and fatty acid composition of different overwintering larvae were assessed.

RESULTS: E. hippophaecolus larvae could survive for a long time at temperatures far below the SCP. Saturated fatty acids became less abundant as overwintering proceeded, while unsaturated fatty acids did the opposite. C10:0, C16:1, C16:0, C18:0, C20:0, C20:5, C22:0 and C24:0 fatty acids showed significant seasonal variation during the overwintering period.

CONCLUSION: E. hippophaecolus is "freezing-tolerant" and cold hardiness is enhanced by increasing fatty acid unsaturation and degrading medium- and long-chain fatty acids and eicosapentaenoic acid.

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