| In order to investigate the interaction between Aphis gossypii Glover and its host plants, it was determined how the aphid feeding affected the contents of soluble sugar, soluble protein, tannin and flavone in the leaves of its five host plants (Cucumis sativus, Cucumis melo var. saccharinus,Cucurbita moschata var.melonaeformis, Lagenaria siceraria var. turbinate and Cucurbita pepo var.medullosa), using anthrone colorimetric method, Coomassie brilliant blue staining, phosphor-molybdenum acid-phosphor-tungstenic acid colorimetry and Soxhlet extraction, respectively.The results showed that the contents of soluble sugar and soluble protein in the leaves of its host plants decreased while the contents of tannin and flavone increased after the host plants were fed by the aphids.This indicated that the aphid feeding caused the decrease of host plant′s nutrition quality while the increase of harmful secondary metabolite contents, and therefore，induced the resistance to herbivores. |
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