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- Title
Amide Metabolism in Wheat Leaves Infected With Stem Rust.
- Authors
Farkas, G. L.; Király, Z.
- Abstract
Wheat leaves infected by stem rust exhibit a high respiratory rate and accumulate ammonia, glutamine and asparagine. Feeding of ammonium salts to healthy tissues led to metabolic alterations which are highly similar to those elicited by rust infection: the respiratory rate was enhanced and glutamine accumulated. The response of rusted leaves to treatment with ammonia was less. The extent of parasitically increased glutamine accumulation is dependent on the reaction type of the tissues. Less glutamine is synthesized by resistant combinations. The mechanism of the parasitically stimulated glutamine synthesis was studied. It has been found that in addition to the increased ammonia production by infected leaves the parasitically enhanced activity of glutamine synthetase also contributes to the accumulation of glutamine. Strangely enough, parallel with glutamine and asparagine accumulation the ability of infected tissues to deamidate externally supplied amides is enormously increased. Slight activation of some deaminases was also observed. Germinating stem rust uredospores exhibited a high deamidase activity. Therefore, the enhanced deamidase activity of the infected tissues might be attributed to the developing fungus. The problem of simultaneous activation of amide synthesis from endogenous sources or from externally supplied ammonium salts and the enormous stimulation of deamidase activity in rusted tissues is discussed and as an explanation the compartmentization of the processes of nitrogen metabolism is offered.
- Subjects
METABOLISM; AMIDES; WHEAT; PUCCINIA graminis; GLUTAMINE; PLANT cells &; tissues
- Publication
Physiologia Plantarum, 1961, Vol 14, Issue 2, p344
- ISSN
0031-9317
- Publication type
Article
- DOI
10.1111/j.1399-3054.1961.tb07870.x