Répartition des formes d'azote et catabolisme des purines chez le dolique tubéreux, Pachyrhizus erosus urban
Ammonia assimilation was investigated in yam bean, Pachyrhizus erosus. The nodules, leaves and pods contained the major part of total nitrogen. Soluble nitrogen was found essentially in pods and stems. Ureide nitrogen content was low in leaves as compared with other organs. The ureides showed two peaks of accumulation, at first nodule appearance and at pod development. In comparison with asparagine, glutamate, glutamine and aspartate, the ureides represented the main form of nitrogen transport. As to enzymes, xanthine dehydrogenase activity was detected only in nodules, in which uricase activity was found to be 50 to 100 times higher than in other tissues. These two enzyme activities showed two peaks, at the beginning of tuberization and at pod development. Allantoicase activity, although present in all parts of the plant, seemed to be greater in the stems. The distribution and change in content of different forms of nitrogen in the tissues is discussed in relation to changes in enzyme activity.
| Main Authors: | , , |
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| Format: | biblioteca |
| Published: |
1985
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| Subjects: | PACHYRHIZUS EROSUS, NODULACION, HOJAS, NITROGENO, ANABOLISMO, AMONIACO, COMPOSICION QUIMICA, |
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