In this paper,normal cucumber,glabrous cucumber and their F1 hybrid were used to study the changes of lignin content,PAL and POD activities after infested by aphid.The results indicated that the PAL and POD activities and lignin content in glabrous cucumber and F1 increased to varying degrees under the harm of aphid,while there were no significant differences between the three types of cucumbers in enzyme activity with no aphid harm.The enzyme activities and lignin content of glabrous cucumber were signific...
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