Crescimento, acúmulo de massa seca e de solutos orgânicos em plantas de faveleira (Cnidoscolus quercifolius POHL et BAILE) crescidas em solução salina.

Abstract

The salinity is one of the factors that affects plant productivity. The introduction of trees consists in alternatives for recovering of degradated salt areas, however, the success of this process depends of knowledge of its effects on the species planted. This study aimed to verify the effects of salinity on plant growth of organic solutes and accumulation in plants of Cnidoscolus quercifolius. The treatments consisted of five levels of NaCl (0; 50; 100; 200; and 400 mmol m-3), distributed in a completely randomized design with four replications. Plants were grown in Leonard pots containing washed sand and nutrient solution, during 60 days under salinity conditions. Height, diameter, dry mass of roots, stems, leaves, shoots and total area accumulation of amino acids, proteins and soluble sugars of roots and leaves, were determined. Salinity caused a linear reduction in growth, dry matter and soluble sugars. The results showed that plants were intolerant to high level of salinity imposed, not being able to adjust osmotically.