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- W1996345093 abstract "Tissues transformed with the isopentenyl transferase (ipt) gene cloned from the T-DNA region of the Ti plasmid or with the ipt gene placed under the control of the cauliflower mosaic virus 35S promoter (35S-ipt) were analyzed for auxin and cytokinin. Free and total indole-3-acetic acid (IAA) levels in 35S-ipt-transformed Nicotiana tabacum and cucumber cells were reduced by 12 to 78% in comparison to untransformed tissues. In contrast, free IAA concentrations in 35S-ipt-transformed Nicotiana plumbaginifolia were almost three times those of untransformed tissues, while total IAA levels were not significantly affected. Cytokinin levels in these antibodies were elevated an average of 300-fold resulting in a 24- to over 2000-fold increase in the cytokinin-to-auxin ratios. High cytokinin-to-auxin ratios correlated with the shooty phenotype of transformed tissues propagated in vitro in the absence of added growth hormones. We conclude that increased endogenous cytokinin-to-auxin ratios can induce cells to undergo morphogenesis and that elevated cytokinin levels can also induce auxin-autonomous growth of transformed tissues without causing a corresponding increase in endogenous IAA levels." @default.
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- W1996345093 title "Cytokinin-to-Auxin Ratios and Morphology of Shoots and Tissues Transformed by a Chimeric Isopentenyl Transferase Gene" @default.
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- W1996345093 doi "https://doi.org/10.1104/pp.91.3.808" @default.
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