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Morphological changes, ethylene production, activation of ACC (1-aminocyclopropane-1-carboxylic acid) synthase and ACC oxidase in leaves of radish (Raphanus sativus L. var. hortensis cv. Shogoin) seedlings by root applied clomeprop [2-(2, 4-dichlorom-tolyloxy) propionanilide] and its acid metabolite 2-(2, 4-dichloro-m-tolyloxy)propionic acid (DMPA) were investigated. The results were compared with our previous data3) in shoot application. In root application, clomeprop induced less leaf angle increase than in shoot application. Rootapplied clomeprop stimulated ACC synthase activity and ethylene production, however, they were much less than that in shoot application. In contrast, root-applied DMPA, which is assumed as an active compound for auxinic activity, induced marked leaf curling and leaf angle increase. Furthermore, root-applied DMPA rapidly activated ACC synthase and ethylene production. The amount of ethylene production was closely related to the degree of morphological change. Therefore, the morphological changes of root-applied clomeprop or DMPA are believed to be caused by ethylene which is increased by DMPA-induced ACC synthase in shoots.

Mechanism of Hormonal Actions Induced by Root-Applied Clomeprop in Radish Seedlings.