Photosynthetic metabolism in the cyanophytaOscillatoria rubescens D.C
| Autor: | Mauricette Feuillade, Eugène Jolivet, Jacques Feuillade |
|---|---|
| Přispěvatelé: | Centre Alpin de Recherche sur les Réseaux Trophiques et Ecosystèmes Limniques (CARRTEL), Institut National de la Recherche Agronomique (INRA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), Unité de recherche Nutrition Azotée des Plantes (URNAP), Institut National de la Recherche Agronomique (INRA) |
| Rok vydání: | 1982 |
| Předmět: |
CYANOPHYCEE
0106 biological sciences Cyanobacteria [SDV]Life Sciences [q-bio] Malic enzyme Photosynthesis 01 natural sciences Biochemistry Microbiology Malate dehydrogenase 03 medical and health sciences Algae Genetics Axenic Molecular Biology 030304 developmental biology chemistry.chemical_classification 0303 health sciences biology General Medicine Metabolism biology.organism_classification Amino acid chemistry 010606 plant biology & botany |
| Zdroj: | Archives of Microbiology Archives of Microbiology, Springer Verlag, 1982, 131 (2), pp.107-111. ⟨10.1007/BF01053990⟩ |
| ISSN: | 1432-072X 0302-8933 |
| Popis: | Short term14C labelling experiments and enzymatic activities related to primary pathways of photosynthesis have been studied in the cyanophytaOscillatoria rubescens D.C. from axenic cyclostat cultures. Responses of samples from cultures with different amounts of nitrogen are presented and compared. Variations in photosynthetic pigments are used to quantify the degree of nitrogen starvation at different levels. PEPcarboxylase activity remains low and is not affected by nitrogen starvation. RuBPcarboxylase activity is lowered to nearly two thirds of its normal metabolic rate by starvation but PEPcarboxykinase and aspartate aminotransferase activities are significantly higher in this case. Malate dehydrogenase is slightly altered and malic enzyme is never active. Starved algae replaced in fresh complete media fix rapidly14C in nitrogen compounds such as amino acids. Results are discussed in regard to both physiological and ecological characteristics ofO. rubescens. PEPcarboxykinase can play a role in making efficient use of HCO 3 - . |
| Databáze: | OpenAIRE |
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