SIMULTANEOUS EFFECT OF WATER STRESS AND SALINITY ON SOYBEAN PLANTS

BARRIOS P; NORIEGA GO; RAÚL LAVADO; BALESTRASSE KB

Buenos Aires

Congreso; SAIB - «Molecular mechanisms in cell signaling and gene expression; 2013

Water stress as well as salinity is the main factor that impairs soybean growth in our country. On one hand water deficiency is the principal reason that affects crop growth and on the other hand in some areas salinity is the most important edafic factor that alters soybean growth. Plants were grown in 1 kg pots containing three parts of Argiudol and two parts of sand. Different watering conditions were employed: 50 and 80% AU field capacity, in the presence of different NaCl raging from 0 to 4 dS/M. Physical and chemical properties were performed in these soil samples. Considering fenologic state R2, plant height showed no difference respect to controls. Plants treated with 80% AU field capacity and 0 dS/M salinity completed their growth cycle, but plant height diminished 35% respect to controls. Oxidative damage was determined in soybean leaves assessing lipid peroxidation. All treatments carried out in the presence of 4 dS/M yielded up to 6-fold increment of this parameter respect to controls. Catalase as well as superoxide dismutase and guayacol peroxidase activities were also determined. Results here reported indicate that salinity is more deleterious than drought. Plants treated with both stresses did not show any synergic effect, indicating that salinity stress predominates.