Dynamic changes in cold hardiness, high-temperature tolerance and trehalose content in the onion maggot, Delia antiqua(Diptera:Anthomyiidae), associated with the summer and winter diapause

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Changes in cold hardiness, high-temperature tolerance and trehalose content in the onion maggot, Delia antiqua(Diptera:Anthomyiidae), associated with the summer and winter diapause were investigated. Survival of summer- and winter-diapausing pupae after a 15 day exposure to -15℃ was greater than 80%, while less than 5% of non-diapausing pupae survived the same treatment. Greater than 80% of winter-diapausing pupae survived -23℃ for 15 days, but survival of summer-diapausing pupae at the same procedure was less than 30%. More than 75% of summer- and winter-diapausing pupae, but not non-diapausing pupae, tolerated 35℃ for 15 days. Trehalose concentrations in summer- and winter-diapausing pupae were not high at the beginning of diapause(≈5 μg/mg), but increased gradually and reached 10 μg/mg in 40 days, although they were kept at relatively high temperatures of 25℃(summer diapause)or 15℃(winter diapause). Cold hardiness of pupae, however, was not proportional to their trehalose content;although trehalose concentrations in winter- and summer-diapausing pupae at day 40(WD40 and SD40)were similar(≈10 μg/mg), cold hardiness of these pupae differed largely(WD40>SD40).
日本応用動物昆虫学会の論文
2001-11-25