【摘要】 西藏飞蝗是青藏高原上的一种重要害虫。近年来,西藏飞蝗在西藏、青海玉树以及川西高原上危害十分严重。通过对该虫各发育阶段过冷却能力测定,研究了各发育阶段虫体内生理生化物质与过冷却能力之间的关系,揭示了该虫耐寒性规律。结果表明,西藏飞蝗蝗卵的过冷却点和结冰点为最低,分别为-22.02℃和-16.36℃。在1~4龄蝗蝻期,过冷却点随体内水分、糖原和脂肪含量随着虫体的发育而升高,其过冷却点分别为-9.28℃、-8.51℃、-7.18℃、-6.46℃;到5龄蝗蝻时,虫体脂肪和糖原含量达最高值,过冷却点下降为-8.07℃。讨论了虫体脂肪、糖原和甘油含量变化与其耐寒力之间的关系。更多还原

【Abstract】 The Locusta migratoria tibetensis is an important pest in the Qing-Tibet Plateau.In recent years,it causes serious damage in Tibet,Yushu of Qinghai,plateau of western Sichuan.The super-cooling points of Locusta migratoria tibetensis were determined.The physiological and biochemical indexes related with the super-cooling capability were also determined.The results indicated the super-cooling point and the freezing point of the egg was the lowest,which was-22.02℃ and-16.36℃ respectively.The nmphs supercooling points increase with increase of hepatin,fat and glycerin content from 1 to 4 instar stage,which was-9.28℃、-8.51℃、-7.18℃、-6.46℃,respectively.However,the super-cooling point descends to-8.07℃ at 5th instar stage,when the contents of fat,hepatin and glycerin were highest.The correlation between the contents of fat,hepatin and glycerin during different development stage and the super-cooling capacity in vivo was also discussed in detail.更多还原