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中文摘要：
小菜蛾Plutella xylostella （L.）是重要的十字花科作物害虫,寄主植物体内营养物质的变化影响小菜蛾生长发育。本研究以小菜蛾嗜好性不同的菜心、芥菜、白菜和芥蓝等4种寄主植物为材料,应用生化方法测定了被小菜蛾取食后寄主植物体内蛋白和糖含量的变化。结果表明：小菜蛾取食2、4、6、8d后,菜心体内蛋白质含量显著升高2%～35%,葡萄糖含量明显下降9%～33%;芥菜、白菜和芥蓝体内蛋白质和葡萄糖含量显著下降1%～38%和3%～36%。小菜蛾取食后,白菜和菜心体内蔗糖含量显著升高,以菜心为害2d后升高最显著,达23.32%;芥菜和芥蓝则随为害程度的不同蔗糖含量略有差异。
英文摘要：
The diamondback moth,Plutella xylostella （ L. ） ,is an important pest in cruciferae crops. The changes of host plants＇ nutrient substances influence its growth and development. In this study,the contents changes of protein and sugar in four preferred species of host plants,Brassica parachinensis,B. juncea,B. chinensis and B. alboglabra,were surveyed after infested by the pests. The results showed that the protein contents of B. parachinensis increased significantly from 7% to 35% after 2,4,6,8 d dam- aged by the moths,on the contrary,the glucose contents decreased obviously from 2% to 33% . Mean- while,the contents of protein and glucose in other three host - plants decreased significantly by 1% - 38% and 3% - 36% ,respectively. However,different changes were found in sucrose contents of 4 host plants,in which B. chinensis and B. parachinensis,increased slightly,especially B. parachinensis went up 23. 32% after damaged 2 d,while B. juncea and B. alboglabra with random changes.
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