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Na and K Interactions in Increasing the Salt Tolerance of Atriplex halimus L.: I. Yield Characteristics and Osmotic Potential

Growth of Atriplex halimus on four different saline media was studied. Growth was strongly stimulated by low levels of all saline media and reached a maximum at different external osmotic potentials for different salinity treatments. Plants grew much better on saline media containing equal parts of NaCl and KCl, and seemed to tolerate much lower external water potential than plants growing on NaCl, KCl, or on different concentrations of Hoagland solutions. In all the four different salinity treatments, osmotic potential of the expressed leaf sap remained nearly constant over all the external osmotic potentials. Although salinity did not change final size of the leaves, the fresh weight and dry weight of a given area of the leaves changed tremendously, depending upon the osmotic substrate. The effect of the kind of osmotically active salt present in the saline medium oll the growth of A. halimus indicates that growth reduction under saline media is not solely a function of its osmotic potential. It appears that overall growth effects can best be described as a combination of stimulatory and inhibitory effects.

Key Words: Growth • Osmotic inhibitions • Succulence

Received for publication November 3, 1969.