Effect of secondary plant substances on winter wheat resistance to grain aphid
1989
Leszczynski, Bogumil | Wright, Lawrence C. | Bąkowski, Tomasz
The association between the concentrations of hydroxamic acids, total phenols, and indole alkoloids in winter wheal cultivars with their antibiotic resistance to the grain aphid Sitobion avenae (F.) (Homoptera: Aphididae) was studied. The antibiosis was measured under field conditions using the intrinsic rate of natural increase (rm). The content of the studied allelochemicals was estimated in flag leaf at the anthesis growth stage. Highly significant negative correlations were found between the rm values and the concentrations of hydroxamic acids (r = -0.905) and total phenols (r = -0.946), but not with indole alkaloids (r = -0.380). The contribution of these allelochemicals to the resistance of winter wheat to S. avenae is discussed.
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