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| Titel: |
Pep-carboxylase activity during ammonium-assimilation in wheat plants |
| Auteur: |
Arnozis, P. A. Barneix, A. J. |
| Verschenen in: |
Journal of plant nutrition |
| Paginering: | Jaargang 12 (1989) nr. 1 pagina's 85-94 |
| Jaar: |
1989-01 |
| Inhoud: |
When 14-day old wheat plants were transferred from a medium containing nitrate as the sole N-source to one containing ammonium, the root NH+4-concentration increased rapidly. This was followed by increases in root phosphoenol pyruvate carboxilase (PEP-carboxylase) activity, concentration of glutamine, and total free amino acids. Eventually the PEP-carboxylase activity reached a plateau and free-NH+4 concentration increased thereafter. Similar plants transferred from NO3- to a mixed N-source (NH+4 + NO3-) also showed an increase in root PEP-carboxylase activity. The enhancement was slower but reached the same final value as for the plants transferred to NH4+ -only. The concentrations of glutamine and free amino acids increased, but to a smaller extent than in the plants transferred to all ammonium. In shoots the treatments produced no detectable changes in PEP-carboxylase activity. It is concluded that high PEP-carboxylase activity in roots helps to prevent accumulation of ammonium to toxic levels. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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