Abstract
The isopentenyl transferase gene was isolated from Agrobacterium tumefaciens AcH5 using polymerase chain reaction and transformed into Petunia and Kalanchoë using both A. tumefaciens and A. rhizogenes transformation systems. Morphological evidence and elevated endogenous cytokinin levels indicated that the PCR product was an active gene. Accurate quantification of the cytokinins was obtained by radioimmunoassay, following purification and separation of the free bases and ribosides by HPLC. Of the six cytokinins quantified, zeatin riboside and its stabilised dihydro-derivative, dihydrozeatin riboside, showed the greatest increases in the transformed Petunia tissue (up to 600-fold). The importance of measuring changes in individual cytokinins is discussed.
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McKenzie, M.J., Jameson, P.E. & Poulter, R.T.M. Cloning an ipt gene from Agrobacterium tumefaciens: characterisation of cytokinins in derivative transgenic plant tissue. Plant Growth Regul 14, 217–228 (1994). https://doi.org/10.1007/BF00024796
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DOI: https://doi.org/10.1007/BF00024796