Abstract
Three monoclonal antibodies (all IgG1) were prepared against the plant cytokinin dihydrozeatin riboside (diH[9R]Z) and characterized for suitability in the isolation and quantification of dihydrozeatin-type phytohormones. These antibodies detected as little as 5-10 pg of the homologous cytokinin when used in both competitive and noncompetitive immunoassays and each had characteristic crossreactivity with structurally-related cytokinins. One antibody was used to quantify HPLC-purified diH[9R]Z recovered from wheat tissue. The same antibody also was linked to an insoluble support for use in affinity purification of a mixture of cytokinins. These antibodies will be useful for purification and quantification of dihydrozeatin and its 9-riboside and 9-glucoside in plant tissue.
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