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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2001.1
- 수록면
- 1 - 9 (9page)
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The smaller fruit tortrix, Adoxophyes orana(Fischer von Roslerstamm), overwinters at larval developmental stage. Cold-hardening is presumed to be expressed during diapause development for successful overwintering in this species. To address this hypothesis, we compared cold tolerance between diapausing and non-diapausing larvae, following overall cold tolerance assays in all stages. Supercooling points(SCPs) varied among developmental stages. The SCPs of adults(-19.8$^{\circ}C$</TEX) were lower than those of pupae (-17.8$^{\circ}C$</TEX) and eggs(-15.2$^{\circ}C$</TEX). The larval stage had the most variable SCPs(-8.5$^{\circ}C$</TEX to -16.8$^{\circ}C$</TEX) among developmental stages, which increased with larval ages. There was, however, no significant difference in SCPs between nondiapausing and diapausing larvae. Field-collected overwintering larvae had rather higher SCPs than did the laboratiry-diapausing larvae. Cold tolerance also varied with developmental stages. All the stages died after a few hour exposure to low temperatures above their SCPs. Pupae were the most susceptible to low temperatures. Diapausing larvae were much more tolerant to cold temperatures than the non-diapausing larvae. Non-diapausing larvae acclimated to 0$^{\circ}C$</TEX for 2h had higher survival in response to lethal low temperature than did the unacclimated larvae. These cold tolerance differences were related with trehalose contents analyzed by an ion-exchange HPLC. Field-collected overwintering larvae and the labratory diapausing larvae had significantly higher trehalose contents than did non-diapausing larvae. These results indicate that A. orana is a freeze-susceptible species and that diapause development elevates cold tolerance in this species. These also suggest that trehalose can be a major polyol conferring cold tolerance to the diapausing larvae.
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