The Translocation of Sulphonamides in Higher Plants

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Abstract
The acetylation of both amino groups on sulphanilaniide has been demon strated by paper chromatography of sap expressed from broad beans treated with suiphanilamide through the roots. Deacetylation of N1- and N4 mides occurred in the leaves of treated plants and the N4 compound was also acetylated to yield the N1: N4-diacetylsulphanilamide. About 30 per cent. of the suiphanilamide entering broad-bean roots was acetylated in the roots, the maximum proportion of the N4-acetyl compound being reached after 7 days. Deacetylation is a more limited process but reaches a steady state after the same time. Low levels of acetylation and deacetylation were recorded in wheat. The amounts of suiphanilamide and N4 entering and accumulating in the various tissues were calculated on a water-uptake basis arid these data show that the main site of acetylation is in the roots and that deacetyla tion occurs to a limited extent in the roots but predominates in stems and leaves.

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