不同寄主植物对草地螟的营养作用及消化酶的影响  

Influences of different host plants on the nutrition and digestive enzymes of Loxostege sticticalis

作　　者：王倩倩[1,2] 王蕾[2] 李克斌[2] 曹雅忠[2] 尹姣[2] 肖春[1] 

机构地区：[1]云南农业大学植物保护学院,昆明650201 [2]中国农业科学院植物保护研究所,植物病虫害生物学国家重点实验室,北京100193

出　　处：《植物保护》2015年第4期46-51,共6页Plant Protection

基　　金：公益性行业(农业)科研专项(201003079)

摘　　要：植食性昆虫可以在取食后通过消化分解和吸收从食物中获得营养从而进行正常的生长发育。不同植物中营养物质成分在质和量上都有很大差别。本文通过用藜(灰菜)、大豆、向日葵、玉米和马铃薯叶片分别饲喂草地螟,发现取食不同寄主植物不仅显著影响草地螟幼虫的相对取食量、相对生长率和食物利用率(P<0.05),而且中肠消化酶活性也不相同。幼虫取食最喜食的藜时,各项营养指标均显著高于其他处理的幼虫,其中肠消化酶活性也最高;而饲喂草地螟幼虫不喜食的马铃薯和玉米时,幼虫无论取食量、生长率还是食物利用率均显著低于其他处理组(P<0.05),中肠消化酶活性较低,但是某些酶活性随取食时间的增加而升高,这可能是昆虫对不适寄主的一种适应。Phytophagous insects can get nutrients from their digestion and assimilation of foods after feeding, which provides a guarantee for their normal growth and development.There are great difference in the quality and counts of nutrients.In this study,Chenopodium glaucum ,Glycine max ,Helianthus annuus ,Zea mays and So-lanum tuberosum were used as the test host plants to feed the Loxostege sticticalis larvae.The results indicated that the relative consumption,relative growth rate and food utilization rate of L .sticticalis larvae feeding differ-ent plants were significantly different （P 〈0.05）and the activities of their intestinal digestive enzymes were en-tirely different.Feeding with the favorite plant Chenopodium glaucum ,three nutritional indexes were obviously better than those of the others,and the activity of midgut digestive enzyme was the highest.Though relative con-sumption,relative growth rate and food utilization rate of the unfavorable host plants Zea mays and Solanum tu-berosum were lower than the others,but the enzymatic activity was increasing along with increasing feeding time. This phenomenon may be the adaption of insects to unfavorable host plants.

关 键 词：草地螟 营养效应 相对生长率 相对取食量 食物利用率 中肠消化酶 

分 类 号：Q965[生物学—昆虫学] S433.4[农业科学—农业昆虫与害虫防治]