Glutamine Synthesis and Its Relation to Photophosphorylation in Pisum Chloroplasts
Open Access
- 1 April 1976
- journal article
- Published by Oxford University Press (OUP) in Plant Physiology
- Vol. 57 (4) , 623-627
- https://doi.org/10.1104/pp.57.4.623
Abstract
Illuminated pea (Pisum sativum) chloroplasts can convert glutamate to glutamine using ATP generated by photophosphorylation to drive the glutamine-synthetase reaction. Light-dependent glutamine synthesis is sensitive to 3-(3,4-dichlorophenyl)-1,1-dimethyl urea (DCMU), but only at concentrations higher than are necessary to suppress photoreduction of ferricyanide or phosphoglycerate. Conversely, glutamine synthesis is far more sensitive to antimycin A than is photoconversion of phosphoglycerate to triosephosphate. When 3.8 mm phosphoglycerate is supplied, glutamine synthesis is stimulated in both the presence and absence of antimycin A.Keywords
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