Effect of short-term salinity on lipid metabolism and ion accumulation in tomato roots
2003
Racagni, G. | Pedranzani, H. | Alemano, S. | Taleisnik, E. | Abdala, G. | Machado-Domenech, E. (U.N.C.R., Rio Cuarto (Argentina). Facultad de Ciencias Exactas)
We compared two tomato cultivars, Pera and Hellfrucht Fruhstamm (HF), considered to be salt-tolerant and sensitive, respectively, in order to examine the ion accumulation and membrane lipid metabolism in response to salinity. Na+ and K+ accumulation was significantly higher in roots of cv. Pera after 24 h and 72 h of 100 mM NaCl. In cv. HF, a temporary increase in K+ accumulation at 24 h was accompanied by a sustained increase in Na+ content. Both cultivars enhanced incorporation of [32P]orthophosphate into phosphatidylinositol 4,5-bisphosphate when exposed to NaCl solution for 24 or 72 h. In parallel to the increase of phosphatidylinositol 4,5-bisphosphate a decrease in phosphorylation of phosphatidic acid and phosphatidylcholine were observed in the sensitive cv. HF. Structural and signal lipid changes in response to salinity were more evident in the sensitive cv. HF than in cv. Pera. Salt tolerant cv. Pera accumulated Na+ ions in the roots without considerable modifications in lipid metabolism.
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