Abstract
The effects of various quinone herbicides and fungicides on the photosynthetic 14CO2 fixation and the incorporation of 14C among the products of photosynthesis in Chlorella pyrenoidosa was investigated. Addition of 30 μm 2,3-dichloro-1,4-naphthoquinone (dichlone), 2-amino-3-chloro-1,4-naphthoquinone (06K-quinone), or 2,3,5,6-tetrachloro-1,4-benzoquinone (chloranil) inhibited CO2 fixation, whereas 1,4-benzoquinone had no effect. Treatment with 3 μm or higher concentrations of dichlone, 06K-quinone or 1,4-benzoquinone also produced marked changes in the pattern of 14C distribution. A noticeable effect was an increase in the proportion of 14C in sucrose and glycine accompanied by a reduction in 14C lipids and glutamic acid. These changes appear to occur as a result of shifts in the flow of carbon along various biosynthetic pathways of photosynthetic CO2 fixation. It is suggested that inactivation of coenzyme A and shortage of reduced triphosphopyridine nucleotide in the quinone-treated cells inhibited the synthesis of lipids and glutamic acid, thereby diverting more carbon into sucrose and glycine.
Full text
PDF
Selected References
These references are in PubMed. This may not be the complete list of references from this article.
- Plaut Z., Gibbs M. Glycolate formation in intact spinach chloroplasts. Plant Physiol. 1970 Apr;45(4):470–474. doi: 10.1104/pp.45.4.470. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Sikka H. C., Shimabukuro R. H., Zweig G. Studies on Effect of Certain Quinones: I. Electron Transport, Photophosphorylation, and CO(2) Fixation in Isolated Chloroplasts. Plant Physiol. 1972 Mar;49(3):381–384. doi: 10.1104/pp.49.3.381. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Zelitch I., Day P. R. Glycolate oxidase activity in algae. Plant Physiol. 1968 Feb;43(2):289–291. doi: 10.1104/pp.43.2.289. [DOI] [PMC free article] [PubMed] [Google Scholar]