THE PHYSIOLOGY OF HOST–PARASITE RELATIONS: IVA. THE EFFECT OF MALEIC HYDRAZIDE ON THE CARBOHYDRATE, NITROGEN, AND FREE AMINO ACID CONTENT OF THE FIRST LEAF OF KHAPLI WHEAT

Abstract

Khapli wheat was grown in sand culture in 1-qt. crocks. Daily applications of maleic hydrazide (10 mg. per crock) were started about 10 days after sowing. After 5 to 12 or 15 days of treatment, samples were taken for analysis. Maleic hydrazide inhibited growth and caused increases in the dry weight, total soluble matter, sucrose, and free amino compounds, particularly glutamine and glutamate, in the first leaves. The treated leaves were also rich in starch which does not normally occur in the wheat leaf.