【摘要】 利用热电偶法测定越北腹露蝗FruhstorferiolatonkinensisWill卵的过冷却点。结果表明,越北腹露蝗卵的过冷却点随季节变化而变动。卵的平均过冷却点从2004年9月初(刚产的卵)的-16.0℃显著下降到2005年1月的-24.7℃,随后卵的过冷却点显著增加到2005年3月的-10.7℃。滞育卵的平均过冷却点(-20.1℃)低于滞育后的平均过冷却点(-12.4℃)。滞育卵在5℃下适应30d后平均过冷却点显著减小到-25.9℃,而在30℃下适应30d后平均过冷却点显著增加到-8.2℃。更多还原

【Abstract】 The supercooling points of Fruhstorferiola tonkinensis Will. overwintering eggs were measured monthly with a thermocouple. The results showed that the mean supercooling points (SCP) vary with seasonal changes. SCP of field collected eggs decreased significantly from a mean value of -16.0℃ in early September (newly laid eggs) 2004 to -24.7℃ in January 2005, then increased significantly to -10.5℃ in March 2005. First, the mean SCP of diapause eggs (-20.1℃ ) is lower than the post-diapause egg (-12.4℃). Second, in laboratory-acclimation experiments, acclimation of 30 days at 5℃ significantly decreased SCP to -25.9℃ for diapause eggs, in contract, acclimation of 30 days at 30℃ significantly increased SCP to -8.2℃.更多还原