Abstract
The addition of 1 micromolar 2,3,5-triiodobenzoic acid (TIBA) to solutions containing KCl resulted in the inhibition of K and Cl uptake in excised barley roots. The effectiveness of TIBA as an inhibitor increased as the pH of the treatment solution decreased and approached the pKa of TIBA. A lag period of approximately 20 minutes existed prior to the onset of TIBA induced inhibition of ion uptake. Respiratory activity was also inhibited by TIBA. The data suggest that in this material, TIBA functions by entering the cytoplasm and inhibiting metabolism. Comparisons made on the effect of added Ca, showed that at pH 5.7 and higher, Ca had no effect on ion uptake whereas at lower pH values the presence of Ca enhanced uptake by offsetting the deleterious effects of H+.
Full text
PDF
Selected References
These references are in PubMed. This may not be the complete list of references from this article.
- Glass A. D. Influence of Phenolic Acids on Ion Uptake: IV. Depolarization of Membrane Potentials. Plant Physiol. 1974 Dec;54(6):855–858. doi: 10.1104/pp.54.6.855. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Glass A. D. Influence of phenolic acids on ion uptake: I. Inhibition of phosphate uptake. Plant Physiol. 1973 Jun;51(6):1037–1041. doi: 10.1104/pp.51.6.1037. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Jacobson L., Moore D. P., Hannapel R. J. Role of Calcium in Absorption of Monovalent Cations. Plant Physiol. 1960 May;35(3):352–358. doi: 10.1104/pp.35.3.352. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Levitan H., Barker J. L. Salicylate: a structure-activity study of its effects on membrane permeability. Science. 1972 Jun 30;176(4042):1423–1425. doi: 10.1126/science.176.4042.1423. [DOI] [PubMed] [Google Scholar]
- Ordin L., Jacobson L. Inhibition of Ion Absorption and Respiration in Barley Roots. Plant Physiol. 1955 Jan;30(1):21–27. doi: 10.1104/pp.30.1.21. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Slayman C. L. Electrical properties of Neurospora crassa. Respiration and the intracellular potential. J Gen Physiol. 1965 Sep;49(1):93–116. doi: 10.1085/jgp.49.1.93. [DOI] [PMC free article] [PubMed] [Google Scholar]