Studies in the respiratory and carbohydrate metabolism of plant tissues - IX. Experimental studies of the influence of oxygen at high pressures on the respiration of apples and of a 'block' in the tricarboxylic acid cycle induced by 'oxygen poisoning'
| Autor: | E. R. Turner, John Barker, C. E. Quartley |
|---|---|
| Rok vydání: | 1960 |
| Předmět: |
biology
Respiration Cell Respiration Citric Acid Cycle Carbohydrates General Engineering chemistry.chemical_element Alcohol Plants Carbohydrate metabolism Medicinal chemistry Oxygen Citric acid cycle chemistry.chemical_compound chemistry Biochemistry Malus biology.protein Carbohydrate Metabolism General Earth and Planetary Sciences Citrate synthase Respiratory system General Environmental Science |
| Zdroj: | Proceedings of the Royal Society of London. Series B. Biological Sciences. 152:88-108 |
| ISSN: | 2053-9193 0080-4649 |
| DOI: | 10.1098/rspb.1960.0026 |
| Popis: | In contrast with peas (Turner & Quartley 1956; Pritchard 1959) apples treated with oxygen at pressures of 2½ or 5 atm showed complex changes with time in the rate of CO 2 output. These changes appeared to be due to the opposed effects of inhibitory and stimulatory processes; the latter caused a large increase in the rate of respiration in oxygen as compared with that of samples held in air. Although then the observed rate of CO 2 output after several days in oxygen was, in general, only a little slower than the rate in air, taking into account the increased rate of respiration in oxygen, there was in fact a marked inhibition of a part or parts of the respiratory process. There was also an accumulation in oxygen of pyruvate, alcohol and citrate and a decrease in the contents of α -ketoglutarate and oxaloacetate, as compared with apples in air. As in the earlier work with potatoes and peas (Barker & Mapson 1955; Turner & Quartley 1956), these changes in the acids were attributed in part to the production of an enzymic ‘block’ in the tricarboxylic acid cycle between citrate and α -ketoglutarate. The indication in previous work (Allentoff, Phillips & Johnston 1954) that the tricarboxylic acid cycle may operate in apples was thus supported. The paper includes data on the influence of a return to air at a pressure of one atmosphere following subjection to oxygen at high pressures. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|