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Articles

Translocation and Metabolism of Ricinine in the Castor Bean Plant, Ricinus communis L. ¹

^a Department of Biochemistry, Agricultural Experiment Station, Oklahoma State University, Stillwater, Oklahoma 74074

Ricinine-3,5-¹⁴C (N-methyl-3-cyano-4-methoxy-2-pyridone) administered to senescent leaves of Ricinus communis L. was translocated to all other tissues of the plant. Developing fruit and especially seeds were found to be labeled the most rapidly. Young growing leaves and other developing tissues of the plant imported ricinine from the senescent leaves much more quickly than mature leaves. Relative intensities of the radioactive ricinine imported and deposited in various tissues indicate a possible functional role of ricinine in the castor bean plant. Data on N-demethyl ricinine presented here may stimulate interest in the possible physiological role of the ricinine to N-demethyl ricinine interconversion.

¹ Journal Article No. 2500 of the Agricultural Experiment Station, Oklahoma State University, Stillwater, Okla. This research was supported in part by research grant GM-08624 from the National Institutes of Health, Bethesda, Md.