Physiological responses of the beet crop under agricultural environment and saline stress

The deleterious effects of salts on plants exposed to high solar radiation tend be more accelerated due the increase toxic ions in aerial plant part. Consequently, physiological and biochemical processes will affected. These can minimized, however, with use management strategies, such as a shading screen protected environment. In this sense, objective work was evaluate responses sugar beet cultivated different environments irrigated saline water. experiment conducted an experimental design entirely randomized, using factorial scheme 3 × 2, equivalent three (FS = full sun; SSOS open sides PE environment) two electrical conductivities irrigation water (0.5 6.2 dS m-1), four repetitions. At 45 days after sowing (DAS) following variables were analyzed: stomatal conductance, liquid photosynthesis, transpiration, internal CO2 concentration, leaf temperature, instantaneous efficiency, carboxylation intrinsic relative chlorophyll index. Irrigation higher salinity negatively affected net temperature efficiency grown sun environment partially mitigated salinity.
 Keywords: Beta vulgaris L., gas exchange, levels.