Growth Repression of Higher Plants by 2-Pyridinethiol, 1-Oxide.

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Abstract
2-Pyridinethiol, 1-oxide and certain of its deriva-tives, which possess broad antibacterial and antifungal activity, have been found to be inhibitory also in certain plant systems. Root elongation and dry matter increase in cucumber and barley seedlings are repressed at low concentrations, but applications of similar concentrations to the tops of several species have not resulted in discernible responses in top growth or development. Root presentation, however, can cause a generalized dwarfing of the plant without the appearance of morphological abnormalities. Recently treated plants may wilt under high moisture stress. The normal developmental sequence is not significantly delayed. Seed from treated plants gives normal seedlings. Higher application rates are lethal. 2-Pyridinethiol, 1-oxide is strongly adsorbed by soil; the dwarfing response, which appears to arise from interference with root development and function, can best be seen in plants grown in sand or vermiculite.

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