Article

A STUDY ON CYTOTOXIC IONS SEQUESTRATION AND K + /Na + LEVELS AS SALT TOLERANT INDICATORS IN TOMATO (Solanum lycospersicum L.)

journal of biological science and bioconservation 01/2012; 4:47-53.

ABSTRACT

The study on ion homeostasis and cytotoxic ion sequestration in tomato (Solanum lycospersicum L.) was investigated. Salinity stress did not show a significant effect (P>0.05) on dry matter accumulation of shoots and roots of tomato. The accumulation of sodium ion (Na +) in root of tomato increased in salt treated groups (50 mM, 75 mM and 100 mM) while in shoot of tomato, the Na + accumulation was highest (6 times higher than the control) in 75 mM treatment. Potassium (K +) uptake was salt concentration dependent in both shoot and root and 50 mM treatment of each organ yielded highest K + content. The Na + /K + levels in shoot and root increased with increasing concentrations but the magnitude of this level is lower in shoot than in root due to the high level of K + content in the shoot tissues. It can be concluded from these findings that Na + was compartmentalised both in shoot and root of tomato by membrane transporters and that low level of Na + /K + level was a good indicator of salt tolerance property in the tomato genotype studied. INTRODUCTION Salinity stress is a major constraint to food production because it limits crop yield and restrict the use of land previously uncultivated. Salinity affects plants through hyper

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