中文摘要：

【目的】随着全球气候变暖,夏季短时极端高温发生的频率逐渐增加。本研究旨在探明二点委夜蛾Athetis lepigone幼虫期对高温的适应性。【方法】将二点委夜蛾不同日龄（1,6,12和18日龄）幼虫在不同高温（35,38和41℃）条件下暴露不同时间（0.5,1,2,4和6 h）后转移至适温（26℃）继续饲养,观察短时高温对其存活率、发育历期、化蛹率、羽化率、雌虫寿命、单雌产卵量及次代卵孵化率的影响。【结果】幼虫期短时高温暴露的温度和时间对二点委夜蛾幼虫的存活率和发育历期有显著影响,而对化蛹率、成虫羽化率、雌虫寿命、单雌产卵量以及次代卵孵化率影响不显著。随着温度的升高和处理时间的延长,幼虫存活率逐渐降低,发育历期逐渐延长。其中,18日龄的幼虫最为敏感,38℃和41℃暴露6 h后存活率分别为58.3%和17.7%,显著低于对照,发育历期分别为25.5 d和29.2 d,较对照显著延长。【结论】幼虫期经历短时高温暴露仅对幼虫的存活和发育历期有影响,而对后续蛹和成虫的生长发育及成虫繁殖力没有影响。

英文摘要：

【Aim】As the global climate becomes warmer,the frequencies of transient extremely high temperature have gradually increased. This study aims to understand the thermal adaptation of Athetis lepigone larvae at high temperature. 【Methods 】 The survival rate,larval duration,pupation rate,emergence rate,female longevity,fecundity and egg hatching rate of A. lepigone reared at the constant temperature 26℃ and treated with heat stress at 35,38,and 41℃ for 0. 5,1,2,4,and 6 h,respectively,in different larval stages were observed and compared with the untreated control reared at the constant temperature 26℃. 【Results】Both temperature and duration of exposure to high temperature significantly affected the survival rate and larval duration of A. lepigone. No significant differences were observed in pupation rate,emergence rate,female longevity and fecundity of adults,and egg hatching rate between the heat stress groups and the control. The survival rate of larvae tended to drop and the larval duration prolonged with the increase of temperature and duration of exposure. The 18-day-old larvae were the most sensitive to high temperature. After the larvae were exposed to 38℃ and 41℃ for 6h,their survival rates were 58. 3% and 17. 7%,respectively,significantly lower than that of the control,and the larval duration was 25. 5 d and 29. 2 d,respectively,significantly longer than that of the control.【Conclusion】Short-term exposure to high temperature in the larval stage of A. lepigone only affects its larval survival rate and duration,but has no effect on its pupal and adult development and adult fecundity.