Abstract
Excised roots of barley (Hordeum vulgare, var. Campana) lost organic acids, amino acids, K+, and Cl− within 15 minutes after initiation of anaerobic treatment or treatment with NaCN and 2,4-dinitrophenol. Initial loss of organic acids when roots were placed under N2 is attributed to a decarboxylation reaction, possibly catalyzed by phosphoenolpyruvate carboxykinase. Organic and amino acids began to leak from the roots to the bathing medium after 1 to 2 hours under N2, indicating injury to cell membranes. During the first hour of anaerobic treatment, K+ loss from low-salt roots was equivalent to organic acid loss. Potassium loss from roots containing high levels of KCl was approximately equal to organic acid plus amino acid loss; and Cl− loss was approximately equal to amino acid loss. It is postulated that, within cells, organic acids may electrostatically bind an equivalent quantity of cations and that amino acids may bind an equivalent quantity of both cations and anions.
Full text
PDF
Selected References
These references are in PubMed. This may not be the complete list of references from this article.
- Epstein E., Hagen C. E. A KINETIC STUDY OF THE ABSORPTION OF ALKALI CATIONS BY BARLEY ROOTS. Plant Physiol. 1952 Jul;27(3):457–474. doi: 10.1104/pp.27.3.457. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Handley R., Overstreet R. Uptake of Strontium by Roots of Zea Mays. Plant Physiol. 1963 Mar;38(2):180–184. doi: 10.1104/pp.38.2.180. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Jacobson L. Carbon Dioxide Fixation and Ion Absorption in Barley Roots. Plant Physiol. 1955 May;30(3):264–269. doi: 10.1104/pp.30.3.264. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Schaedle M., Jacobson L. Ion Absorption and Retention by Chlorella pyrenoidosa. I. Absorption of Potassium. Plant Physiol. 1965 Mar;40(2):214–220. doi: 10.1104/pp.40.2.214. [DOI] [PMC free article] [PubMed] [Google Scholar]