biologia plantarum

Biologia plantarum 46:373-377, 2003 | DOI: 10.1023/B:BIOP.0000023880.33075.41

Effect of Short-Term Salinity on Lipid Metabolism and Ion Accumulation in Tomato Roots

G. Racagni^1,*, H. Pedranzani¹, S. Alemano¹, E. Taleisnik², G. Abdala¹, E. Machado-Domenech¹

¹ U.N.R.C, Facultad de Ciencias Exactas, Río Cuarto, Argentina

² INTA, Instituto de Fitopatología y Fisiología Vegetal, Córdoba, Argentina

To examine the ion accumulation and membrane lipid metabolism in response to salinity we compared two tomato cvs. Pera and Hellfrucht Fruhstamm (HF), considered to be salt-tolerant and sensitive respectively. Na⁺ and K⁺ accumulation was significantly higher in roots of cv. Pera after 24 h and 72 h of 100 mM NaCl. While 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 at 24 h and 72 h of NaCl. 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. Salt tolerant cv. Pera accumulated Na⁺ ions in the roots without considerable modifications in lipid metabolism.

Keywords: Lycopersicon esculentum; salt stress; phospholipids; sodium; potassium

Subjects: cultivar and genotype differences, salt tolerance; lipid metabolism, short-term salinity; Lycopersicon esculentum; phospholipids, short-term salinity; potassium, short-term salinity; resistance/tolerance to salinity; root, short-term salinity; salt stress, lipid metabolism, root; salt stress, tolerance; short-term salinity, lipids; sodium, short-term salinity; tomato, short-term salinity

Published: November 1, 2003  Show citation