T-DNA genes to study plant development: precocious tuberisation and enhanced cytokinins in A. tumefaciens transformed potato |
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Authors: | Ooms G Lenton J R |
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Institution: | (1) Biochemistry Department, Rothamsted Experimental Station, AL5 2JQ Harpenden, Herts, U.K.;(2) Present address: Plant Sciences Division, Long Ashton Research Station, University of Bristol, Long Ashton, BS18 9AF Bristol, England |
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Abstract: | Summary Potato Line Mb1501B is a derivative of the cultivar Maris Bard (Solanum tuberosum), transformed with T-DNA from A. tumefaciens strain LBA1501. In culture it grew as frequently branching stunted shoots with a basal callus, lacking roots. These shoots did not form tubers. When grafted, Mb1501B shoots gradually became morphologically more normal and aerial tubers formed readily. Cultured Mb1501B shoots contained 100–200-fold higher concentrations of the biologically-active cytokinins zeatin, zeatin riboside and their corresponding side-chain o-glucosides than untransformed Maris Bard shoots. Cultured Mb1501B shoots contained approximately a 3-fold lower concentration of indole acetic acid (IAA). In grafted Mb1501B plants a 3–10-fold higher concentration of the active cytokinins was found compared with untransformed plants and no difference in IAA concentration. |
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Keywords: | Agrobacterium tumefaciens auxin cytokinin potato tuberisation |
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