Abstract:In order to demonstrate the difference in plant defense response after aphid feeding, six specific genes and differential expression genes in two resistant varieties in different time were analyzed through using RT-PCR and cDNA-AFLP. The results showed that LOX gene expresses highly in 48 h in susceptible variety and strongly induces in 72 h in resistant variety. The gene of AOS is parallel to LOX in susceptible variety, but AOS always expresses in resistant variety. The PDF1.2 expresses all the times in resistant variety, but only 48 h in susceptible variety. There is no difference on PAL gene in two varieties. In resistant variety, PR-1 gene is induced in 72 h and 96 h but no change in susceptible variety. BGL2 expresses strongly after 48 h in resistant variety, but no expression in susceptible variety. The cDNA-AFLP results demonstrated many differential expression genes after aphid feeding from in two wheat varieties. We isolated ten genes randomly and analyzed their sequence. The defense involved octadecanoid pathway and pathogenesis-related proteins.