Abstract
We studied the effects of inhibitors of ornithine decarboxylase (ODC), arginine decarboxylase (ADC) and spermidine synthase (Spd synthase) on organogenesis and the titers of polyamines (PA) and alkaloids in tobacco calli. DL-α-difluoromethylarginine (DFMA) and D-arginine (D-Arg), both inhibitors of ADC activity, were more effective than DL-α-difluoromethylornithine (DFMO), an inhibitor of ODC, in reducing titers of PA and the putrescine (Put)-derived alkaloids (nornicotine and nicotine). Dicyclohexylammonium sulfate (DCHA), an inhibitor of Spd synthase, was also more efficient than DFMO in reducing PA and alkaloid levels. Root organogenesis is inversely related to the titers of Put and alkaloids. Thus, DFMA and D-Arg, which strongly inhibit Put and alkaloid biosynthesis, markedly promote root organogenesis, while control callus with high Put and alkaloid content showed poor root organization. These results suggest that morphological differentiation is not required for activation of secondary metabolic pathways and support the view that ADC has a major role in the generation of Put going to the pyrrolidine ring of tobacco alkaloids.
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Tiburcio, A.F., Kaur-Sawhney, R. & Galston, A.W. Effect of polyamine biosynthetic inhibitors on alkaloids and organogenesis in tobacco callus cultures. Plant Cell Tiss Organ Cult 9, 111–120 (1987). https://doi.org/10.1007/BF00044246
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DOI: https://doi.org/10.1007/BF00044246