Abstract
The respiratory metabolism was studied in three types of sugarbeet ( Beta vulgaris L. var. altissima) calli: a normal callus (N) and two fully habituated (auxin- and cytokinin-independent) calli, organogenic (HO) and non-organogenic (HNO). Except for the HO callus at day 14, the oxygen consumption rates of the habituated calli were always higher than that of the normal callus throughout the cycle of culture. The maximum activity of the cyanide-resistant pathway (alternative pathway) was much higher in the two habituated calli than in the normal one. By contrast, important differences were found in HNO and HO calli concerning the activity of the cytochrome pathway. In HNO cells, the high activity of this pathway was correlated with a high ATP level while the inverse situation was observed in HO cells. The physiological significance of these results is discussed.
Published Version
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