温度对黑豆蚜体内共生菌胞数量及宿主体型大小的影响  

Effect of temperature on the abundance of mycetocytes in Aphis fabae Scopoli (Aphididae, Homoptera) and body size of their hosts

作　　者：李献辉[1] 李保平[1] 

机构地区：[1]南京农业大学昆虫学系农业部农业昆虫与害虫防治重点实验室,南京210095

出　　处：《昆虫学报》2006年第3期428-432,共5页Acta Entomologica Sinica

基　　金：国家自然科学基金项目(30370237)

摘　　要：为了明确饲养温度对黑豆蚜Aphisfabae内共生菌和宿主蚜虫体型大小的影响,对在室内不同温度下饲养的黑豆蚜内共生菌胞数量和宿主蚜虫体型大小进行了观察和统计分析。结果表明,温度对同一发育时期蚜虫内共生菌胞数量的影响在不同温度范围内有所不同,1龄若蚜体内的菌胞数量除在25℃与35℃间有显著差异外,在其余各温度间没有显著差异;其余时期的蚜虫内共生菌胞数量在高温(>30℃)下显著低于较低温度下的菌胞数量,存在负直线相关性。温度对菌胞数量随宿主发育到产仔前的变化趋势有不同程度的影响,在较低温度(15℃、20℃和25℃)下,菌胞数量随虫体发育显著增加;但在高温(30℃和35℃)下,蚜虫体内菌胞数逐渐增加直到3龄达到最高,然后略有下降(30℃)或显著下降(35℃)。除1龄若蚜外,蚜虫体型大小总体呈现随温度升高而降低的格局,但随其内共生菌数量增多而增大(35℃下除外)。据此认为,温度可能通过作用于蚜虫内共生菌胞数量而影响蚜虫体型的大小。To explore the effect of between breeding temperature on the endosymbiotic bacteria in Aphis fabae Scopoli and body size of their hosts, the changes in the abundance of mycetocytes and host body size under different temperatures were observed in the laboratory. The results showed that the effect of temperature on the abundance of mycetocytes was dependent on the developmental stage of aphids. The abundance of mycetocytes in the 1 st instar nymphs of the aphid showed no difference at different temperatures except at 25 ℃ and 35 ℃, but showed significant difference in the other life stages of the aphid at different temperatures, and a negative correlation between the abundance of mycetocytes and temperature was found. Temperature also affected, to some extent, the trend of the abundance of mycetocytes following the development of aphids. The abundance of mycetocytes increased with the development from nymph to adult before larviposition in the aphid at 15℃, 20℃ and 25℃, but culminated at the 3rd instar and thereafter declined at higher temperatures （30℃ and 35 ℃ ）. Aphid body size in all stages except for the 1 st instar declined with the increase of temperature but increased with the abundance of mycetocytes at all temperatures except at 35 ℃. It is tentatively hypothesized that temperature affects aphid body size via influence on the abundance of mycetocytes.

关 键 词：黑豆蚜 内共生菌 温度 菌胞数量 宿主体型大小 

分 类 号：Q968[生物学—昆虫学]