Abstract

MORALES, D et al. STRESS EFFECT OF NaCl on growth and water relations in tomato (Solanum lycopersicum L.) during the growing. cultrop [online]. 2010, vol.31, n.4, pp. 00-00. ISSN 0258-5936.

This study was conducted with the aim of determining tomato plant behavior during the vegetative period under different saline treatments; thus, growth and water relations were evaluated in cv. Amalia, subjected to several NaCl treatments in the medium for 264 h. It was performed in a growth chamber with a 13-h photoperiod, a photosynthetically active radiation of 380 µmol.m-2.s-1, a day/night temperature of 25/180C and a day/night relative humidity of 60/70 %. Plants developed in pots containing silica sand and put in trays, besides adding Hoagland nutrient solution. The treatments used were 0, 50, 100 and 200 mM NaCl. Once treatment application phase was concluded, plants were placed under nutrient solution conditions without NaCl for 264 h to evaluate their recovery. Evaluations of biomass, stomatal conductance, transpiration and leaf water, osmotic, pressure and osmotic at a top saturation potentials before dawn and root water conductivity were recorded after 24, 48, 120 and 264 h of applying treatments, as well as after staying for 264 h under recovery conditions. The analysis of data showed a significant reduction of different variables evaluated, when increasing NaCl content in the medium, besides observing that after 24 h of applying treatments, the osmotic adjustment had not yet occurred.

Keywords : salinity; water relations; water conductivity; osmotic adjustment; tomato.

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