Abstract
A. halimus plants were grown in saline nutrient solution (Knop's), in growth chambers, under two different conditions of relative humidity of the air: 27 3 % (dry) and 65 3% (humid). All other climatic factors (temperature, illumination, etc.) were identical. Relative humidity was programmed to remain constant irrespective of day and night temperature changes. The salinity range was 0 to -20 atm NaCl.