Uptake and Movement of14C-Chlormequat Chloride Applied to Leaves of Barley and Wheat

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Abstract
Chlormequat chloride labelled with 14C was applied to the third leaf of Proctor barley and Maris Dove wheat; after 1 d less than a fifth could be washed off with water. More 14C-labelled material moved from treated areas of wheat than of barley to accumulate in tips of treated leaves, younger main-stem leaves, main stems, and ears. Relatively small amounts of radioactive material accumulated in roots, but less in wheat than barley. About 80% of the radioactivity was recovered from plants up to 1 week after application, but the amounts recovered in aqueous washings and extracts decreased faster from wheat than from barley.