| Autor: |
Heinrich P. Fock, Michael G. Berger |
| Rok vydání: |
1984 |
| Předmět: |
|
| Zdroj: |
Advances in Photosynthesis Research ISBN: 9789024729449 |
| DOI: |
10.1007/978-94-017-4973-2_202 |
| Popis: |
The ammonia released from glycine during photorespiration is reassimilated by glutamine synthetase (GS) and glutamate synthase (GOGAT, Woo et al. 1978, Keys et al. 1978). Studies on leaf discs infiltrated with 15N-glycine (Woo et al. 1982) indicated the occurence of this pathway in the light even though photosynthesis would presumbly be inhibited under these conditions. Evidence from treatments of leaves with inhibitors (Platt and Anthon 1981, Kaiser and Lewis 1980) or from studies on mutants lacking ferredoxin glutamate synthase (Somerville and Ogren 1980) or mitochondrial serine hydroxymethyltransferase (Somerville and Ogren 1981) indicated the occurence of the proposed pathway for photorespiratory N recycling. In recent studies we have fed 15N-glycine and inhibitors through the leaf base (Berger and Fock 1983 a,b) and demonstrated the operation of the photorespiratory N cycle in maize leaves. This study compares the pattern of 15N incorporation into the intermediates of the photorespiratory N cycle from 15N labelled glycine, glutamate and glutamine and supplies estimates for the recycling of photorespiratory ammonia in the GS/GOGAT pathway. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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