Abstract
During the formation ofHelianthus tuberosus tubers the activities of arginine decarboxylase (ADC) and S-adenosylmethionine decarboxylase (SAMDC), examined in medullary parenchyma cells, increase with the increase in weight of the tuber. The ornithine decarboxylase (ODC) activity is about 100-fold less with respect to ADC activity, and it was detected only during the deceleration phase of the growth curve. Spermidine and spermine content are strictly related to the SAMDC activity and tuber growth. The increase of ADC and SAMDC activity is directly related to cell extension and increase in weight. The limited area of cell division in parenchyma tissue found during the first stage of tuber formation could justify the low ODC activity. The data suggest that ADC affects mainly growth processes, while ODC seems to be preferentially related to cell division.
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Bagni, N., Barbieri, P. & Torrigiani, P. Polyamine titer and biosynthetic enzymes during tuber formation ofHelianthus tuberosus . J Plant Growth Regul 2, 177–184 (1983). https://doi.org/10.1007/BF02042246
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DOI: https://doi.org/10.1007/BF02042246