Article: Regulation of salt respiration in carrot root slices.
2006 Volume 50, Issue 6, Page(s) 682–686
Abstract: In slices of carrot-phloem parenchyma washed for 7 days in water at 20 C, 50 mm KCl stimulates respiration by up to 100% of the ground respiration within 4 minutes of application. The data presented imply that ADP liberated in the cytoplasm as a ... ...
Abstract | In slices of carrot-phloem parenchyma washed for 7 days in water at 20 C, 50 mm KCl stimulates respiration by up to 100% of the ground respiration within 4 minutes of application. The data presented imply that ADP liberated in the cytoplasm as a consequence of KCl accumulation first stimulates a regulator reaction requiring ADP (phosphoglycerate kinase). Thereafter, the point of control alternates between this reaction and the phosphofructokinase reaction, forming a sequence of enzyme stimulations which continue after the new steady state of increased respiration is established. KCl induces a similar sequence in slices washed for 3 days, but it is completed within 3 minutes, and metabolite oscillations are not so marked. In slices washed for 2 days, KCl stimulates respiration by less than 10%, and the sequence of regulator reactions does not occur. Phosphoglycerate kinase is the only enzyme stimulated within 3 minutes of applying KCl to these slices. Contrary to previous reports, KCl frequently stimulates the respiration of freshly prepared slices by 10 to 30%. |
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Language | English |
Publishing date | 2006-04-28 |
Publishing country | United States |
Document type | Journal Article |
ZDB-ID | 208914-2 |
ISSN | 1532-2548 ; 0032-0889 |
ISSN (online) | 1532-2548 |
ISSN | 0032-0889 |
DOI | 10.1104/pp.50.6.682 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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