五种地老虎幼虫抗寒性的比较研究  

COMPARATIVE STUDIES OF COLD HARDINESS IN FIVE SPECIES OF CUTWORM

作　　者：黄国洋[1] 王荫长[1] 尤子平[1] 

机构地区：[1]南京农业大学植物保护学系

出　　处：《南京农业大学学报》1992年第1期33-38,共6页Journal of Nanjing Agricultural University

摘　　要：5种地老虎越冬幼虫室内抗寒力测定结果表明:大地老虎、黄地老虎、三叉地老虎和警纹地老虎在-8℃±2下的致死中时间(LT_(50))分别为28,30,33与36天,而小地老虎在0°C下的LT_(50)仅为8天.在室内经降温锻炼,可以提高上述大地老虎等4种越冬幼虫的抗寒力,但对小地老虎幼虫无效.降温锻炼后,前四种幼虫的过冷却点,分别从-9.9℃±2.8,-12.6℃±3.0,-7.6℃±2.0与-17.7℃±3.7下降到-16.0℃±3.7,-17.5℃±4.0,-17.4℃±5.7与-25.2℃±2.8.生化分析结果表明,小地老虎幼虫与其它4种地老虎幼虫相比,不能随着温度的下降而调节代谢机制,积累抗寒物质,在我国大部分地区,只能通过迁飞来回避低温的伤害.Four constant temperatures were used to investigate the role of low tempera-tures in triggering or modulating cold hardiness in cutworm larvae of Agrotis ypsiion,A.tokionis,A.segetum,A.trifurca and A.exclamationis.The lethal times for 50% mortalities(LT_50)under treated low temperatures,supercooling points(SCP)and severalcryprotectants of these larvae were determined.The LT_50 of A.ypsilon at 0℃,was 8 days.However,the LT_50 of A.tokionis,A.segetum,A.Trifurca and A.exclamationis were 28,30,33,and 36 days respectively.The SCPof A.tokionis,A.trifurca,A.segetum and A.exclamationis were -15.98℃ -17.5'C,-17.41℃and -25.2℃ respectively,but the SCP of A.ypsilon only being -6.4℃,during the period ofacclimation.Except the larvae of A.ypsilon,other four species were easily adapted to low tempera-tures.High concentrations of sugars(especially glycogen and trehalose),amino acids(es-pecially alanine and serine)and glycoproteines were induced by low temperatures.

关 键 词：地老虎 幼虫 抗寒性 过冷却点 

分 类 号：S433.82[农业科学—农业昆虫与害虫防治]