Abstract
Calli derived from leaves and radicles of B. ternifolia were grown on Murashige and Skoog (MS) basal medium, and the effects of different nitrogen sources on the rate of callus growth and on the enzymes related to nitrogen assimilation were studied. Ammonium alone did not support callus growth unless a Krebs-cycle intermediate was added to the medium. The activities of glutamine synthetase (EC 6.3.1.2), glutamate synthase (EC 1.4.7.1), and glutamate dehydrogenase (EC 1.4.1.2) were measured in homogenates of callus grown on media supplied with different nitrogen sources. The results indicate that leaf and root calli have similar levels of these enzymes when grown on MS medium (Murashige and Skoog 1962. Physiol. Plant. 15, 473–497). However, when the calli were supplied with glutamine as the sole nitrogen source, the activity of glutamate synthase increased in leaf callus but was almost completely inhibited in root callus. The results indicate that calli originated from different B. ternifolia tissues do not have the same biochemical dedifferentiated state.
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Abbreviations
- GDH:
-
glutamate dehydrogenase
- GOGAT:
-
glutamate synthase
- GS:
-
glutamine synthetase
- L:
-
leaf
- MS:
-
Murashige-Skoog medium
- R:
-
root
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de Jiménez, E.S., Fernández, L. Biochemical parameters to assess cell differentiation of Bouvardia ternifolia Schlecht callus. Planta 158, 377–383 (1983). https://doi.org/10.1007/BF00397728
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DOI: https://doi.org/10.1007/BF00397728