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Your Position :Home->Past Journals Catalog->2013年50 No.5

Study on Cold-hardiness of the Wild Diapaused Larvae of Ostrinia Furnacalis in Northeastern China
Author of the article:ZHANG Zhu-Ting
Author's Workplace:Shenyang Agricultural UniversityNortheast Agricultural University
Key Words:Ostrinia furnacalis; supercooling point; low temperature survival rate; cold hardiness; strategies
Abstract:Abstract: The freeze resistance capability and cold-hardiness of the wild diapaused larvae of Asian corn borer(ACB) ,Ostrinia furnacalis(Guenée) were investigated through comparing the supercooling point (SCPs) and low temperature survival rates of seven geographical populations (Jiamusi, Dehui, Gongzhuling, Shenyang, Wafangdian, Pulandian, and Lvshun ) collected from the northeastern China. Results showed that the SCPs in the range of -6.18~-29.98℃were significantly different(P<0.05),with an average varying from -13.95 to -25.85℃,among the geographic populations, but there was no strict correlation between the SCPs and their geographic latitudes; after 12 h cold exposed, the mortality was decreased with the increasing latitudes ,and significantly different(P<0.05); the Median lethal temperatures(LT50) were significantly different(P<0.05) in the range of -52.19~-68.19℃ and decreased with the increasing latitudes; after 12 h cold exposed ,the test insects were no death above the -30℃,however the mortality was increasing with the decreased temperatures below the -30℃ and after 12 h frozen, some could resuscitate at the -80℃. So we can determine that the cold-hardiness was the overwintering strategy for Asian corn borer; the cold resistance strength was no that SCP but that survival of low temperature and LT50。
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