The Uptake and Transloeation of 1-Methylpyridinium Chloride and Related Model Compounds in Wheat

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Abstract
Solutions of the organic salt 1-methylpyridinium chloride were applied as μ1 droplets to specific areas of wheat leaves and the uptake and transloeation of the solute measured over a period of several days. The methylpyridinium ion rapidly penetrates into the leaf tissue and is taken up by the cells and progressively redistributed throughout the rest of the plant via the phloem and xylem. The rate and pattern of movement is influenced by the external humidity but is not sensitive to minor variations in droplet location on the plant. The distribution of related pyridine derivatives and of some other compounds has also been investigated and it is concluded that none of the pyridiniums possess the high phloem mobility of maleic hydrazide or 2-aminoisobutyric acid but that 1-methyl-2-pyridone does show exceptional xylem mobility. The results are discussed on the basis of possible mechanisms of solute movement and equilibration within the tissue.

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