Comparative study of respiratory metabolism in three types of sugarbeet calli,a normal and two habituated ones (organogenic and non-organogenic) |
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| Institution: | 1. Laboratoire de biochimie et physiologie végétales, Ubo, BP 809, 29285 Brest, France;2. Laboratoire de biologie des ligneux, BP 6759, 45067 Orléans cedex 2, France;1. National Institute of Science and Technology on Plant Physiology Under Stress Conditions, Departamento de Biologia Vegetal, Universidade Federal de Viçosa, Viçosa, Minas Gerais, 36570-900, Brazil;2. Setor de Fisiologia Vegetal - Departamento de Biologia, Universidade Federal de Lavras, Lavras, Minas Gerais, 37200-000, Brazil;3. Max-Planck-Institute of Molecular Plant Physiology, Am Mühlenberg 1, 14476, Potsdam Golm, Germany;1. School of Integrated Chinese and Western Medicine, Anhui University of Chinese Medicine, Hefei, 230012, China |
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| 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. |
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