The metabolism of carboxin in growing barley

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Abstract
The major soluble metabolite of carboxin (2,3‐dihydro‐6‐methyl‐5‐phenylcarbamoyi‐1,4‐oxathiin) in barley seedlings and mature plants was identified as the‐hydroxy phenyl derivative. This phenol was also bound to the lignin fraction. The distribution of carboxin and its metabolites in seedlings and mature plants grown from treated seed was studied; maximum residues were found in the three oldest internodes, with traces in the roots and flowering heads. Treated plants had altered chlorophyll/carotenoid ratios, and raised levels of some free amino acids.