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Articles

Chemical Basis for Greenbug Resistance in Small Grains

II. Identification of the Major Neutral Metabolite of Benzyl Alcohol in Barley ¹

Robert L. Burton^b and Kenneth J. Starks^b

^a Department of Biochemistry, Oklahoma State University, Stillwater, Oklahoma 74074, Agricultural Research Service, United States Department of Agriculture, Oklahoma State University, Stillwater, Oklahoma 74074

(¹⁴C)Benzyl alcohol was administered either by uptake through the roots or by injection directly into the stems of wheat (Triticum aestivum L. em Thell), sorghum (Sorghum bicolor. L Moench) and two strains of barley (Hordeum vulgare L.). One strain of barley was susceptible to the greenbug (Schizaphis granium Rondani), and the other was greenbug-resistant. In all four plants, several radioactive metabolites were formed. The major neutral metabolite has been identified as benzyl--D-glucopyranoside. This glucoside was found to have no biological activity against the greenbug under conditions in which the parent compound, benzyl alcohol, inhibits the reproduction of this insect pest.

¹ Journal Article J 2939 of the Agricultural Experiment Station, Oklahoma State University. This research was supported in part by United States Department of Agriculture Contract No. 12-14-100-10, 439 (34).