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Título: | Aquaporin functionality in relation to H+-ATPase activity in root cells of Capsicumm annuum, L. grown under salinity. |
Autor: | Martínez-Ballesta, M. Carmen CSIC ORCID; Martínez, Vicente CSIC ORCID; Carvajal, Micaela CSIC ORCID | Fecha de publicación: | 28-feb-2003 | Editor: | John Wiley & Sons | Citación: | Physiologia Plantarum 117(3): 413-420 (2003) | Resumen: | As water and nutrient uptake should be related in the response of plants to salinity, the aim of this paper is to establish whether or not aquaporin functionality is related to H+-ATPase activity in root cells of pepper (Capsicum annuum L.) plants. Thus, H+-ATPase activity was measured in plasma membrane vesicles isolated from roots and aquaporin functionality was measured using a cell pressure probe in intact roots. Salinity was applied as 60 mM NaCl or 60 mM KCl, to determine which ion (Na+, K+ or Cl−) is producing the effects. We also investigated whether the effects of both salts were ameliorated by Ca2+. Similar results were obtained for cell hydraulic conductivity, Lpc, and H+-ATPase activity, large reductions in the presence at NaCl or KCl and an ameliorative effect of Ca2+. However, fusicoccin (an activator of H+-ATPase) did not alter osmotic water permeability of protoplasts isolated from roots. Addition of Hg2+ inhibited both ATPase and aquaporins, but ATPase also contains Hg-binding sites. Therefore, the results indicate that H+-ATPase and aquaporin activities may not be related in pepper plants. | Descripción: | 8 pages, 5 figures, 2 tables. | Versión del editor: | http://dx.doi.org/10.1034/j.1399-3054.2003.00044.x | URI: | http://hdl.handle.net/10261/19771 | DOI: | 10.1034/j.1399-3054.2003.00044.x | ISSN: | 0885-5684 |
Aparece en las colecciones: | (CEBAS) Artículos |
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