松突圆蚧花角蚜小蜂成虫的耐热性  

Heat tolerance of Coccobius azumai Tachikawa adult

作　　者：钟景辉 

机构地区：[1]福建省泉州市森林病虫防治检疫站,福建泉州362000

出　　处：《福建农林大学学报（自然科学版）》2010年第5期465-470,共6页Journal of Fujian Agriculture and Forestry University:Natural Science Edition

基　　金：福建省科技厅重大专项资助项目(2006NZ0001-2);泉州市优秀人才培养专项资助项目(08A05)

摘　　要：以试管内喂食20%蜂蜜的1日龄松突圆蚧花角蚜小蜂(Coccobius azumaiTachikawa)成虫为研究对象,通过人工模拟高温暴露试验,采用死亡率、半致死高温累积(LSHIT50)和造成热伤害的高温累积下限(LLSEHIT)等指标,比较了雌成虫耐热性的季节变化和夏季雌、雄成虫耐热性的差异.结果表明:(1)随着温度的升高,花角蚜小蜂雌成虫各季的死亡率均逐渐增大,秋、春、夏季种群分别在39.5、40和41℃时死亡率达到100%.在39-40.5℃下,不同季节之间种群死亡率具有显著差异(P<0.05),主要表现为夏季种群的死亡率显著较低.比较雌成虫的LLSEHIT和LSHIT50,不同季节耐热性呈现明显的变化,其耐热性大小次序为夏季>秋季>春季,但秋季种群对高温累积最为敏感,夏季次之,春季最弱.花角蚜小蜂雌成虫LSHIT50随着季节性平均气温、极端高温的升高表现出明显的升高趋势.(2)夏季花角蚜小蜂雌、雄成虫个体存活的极限高温为41℃左右;在39-40.5℃下,雄成虫对高温更敏感,死亡率显著高于雌成虫,说明雌成虫比雄成虫具更强的耐热性.The heat tolerance of Coccobius azumai adult was analyzed and compared in different seasons through exposure to artificial high temperature.The results showed that there was an increasing trend of mortality in the parasitoid of female adults from each season with the rising of exposed temperature.However,significant death differences were observed among different seasons when the parasitoids exposed to 39-40.5 ℃,and the mortality of summer female adults seemed to be the lowest.The results for the indices of the lower limited sum of effective heat injurious temperature（LLSEHIT） and the semi-lethal sum of heat injurious temperature（LSHIT50） showed that the sequence of heat tolerance in the female adults in various seasons was summer autumnspring,and a clearly seasonal adaptability to heat was proved.The seasonal mean air temperature and extreme high temperature might be the main causes of this adaptability.A separate experiment showed that the extreme high temperature was 41 ℃ either in female or male adults.Whereas,mortality in male adults was higher than that in female adults when exposed to 39-40.5 ℃,which indicated that the female adults had higher heat tolerance than the male adults.

关 键 词：松突圆蚧花角蚜小蜂 极端温度 耐热性 

分 类 号：S763.3[农业科学—森林保护学]