Difference in heat tolerance and enzyme activity between Calliptamus italicus (Orthopera:Acrididae) and Gomphocerus sibiricus (Orthopera:Acrididae)
Author of the article:LI Shuang** CAI Meng-Ting MA Wan-Ying JI Rong***
Author's Workplace：College of Life Sciences, Xinjiang Normal University; Key Laboratory of Conservation Biology and Management for Xinjiang Special Species; International Research Center for Cross-border Pest Management in Central Asia, Urumqi 830054, China
Key Words：heat-resistant difference, protection enzymes, the spatial distribution, Calliptamus italicus, Gomphocerus sibiricus
Abstract：
[Objectives] To clarify difference in heat tolerance and enzyme activity between Calliptamus italicus and Gomphocerus sibiricus. [Methods] The mortality and POD, SOD, and CAT, enzyme activity of C. italicus and G. sibiricus were measured by placing adults in a climate cabinet and subjecting them to 3℃ temperature increments for 4 h. The temperature ranges to which insects were exposed were 27-48℃ for C. italicus and 24-42℃ for G. sibiricus. [Results] The mortalities of C. italicus and G. sibiricus were significantly different (P<0.05). The LT50 and LT90 of C. italicus were 48.76℃ and 50.67℃, respectively, for females, and 47.90℃ and 50.53℃ for males. The LT50 and LT90 of G. sibiricus were 39.21℃ and 42.10℃, respectively, for females, and 36.11℃ and 41.43℃ for males. POD, SOD, and CAT, activities of C. italicus and G. sibiricus males first increased, then decreased, whereas the POD activity of C. italicus females first decreased, then increased, with temperature. Within the temperature range of 27℃ to 42℃, POD and SOD activity rapidly rose to 54.69% and 23.54%, respectively, in G. sibiricus. CAT activity rose to 27.02% in C. italicus. [Conclusion] C. italicus is more heat tolerant than G. sibiricus.