Abstract
The grain aphid Sitobion avenae (F.) (Homoptera: Aphididae) is a common pest of winter wheat in Poland. One of the most important cereal resistance mechanisms in winter wheat is antibiosis. The level of antibiosis is usually associated with the quantitative and qualitative composition of different nutritional and allelochemical components in the host plant tissues. Numerous reports have indicated that some non-protein amino acids play an important role in plant resistance (Romero, 1984; Weibull, 1988). The aim of this study was to compare some correlations between the concentrations of L-3,4-dihydroxyphenylalanine (L-DOPA), ornithine and γ-aminobutyric acid (GABA) in moderately resistant and susceptible winter wheat varieties with their antibiotic resistance to S. aυenae.
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