| Effects of sodium chloride on growth, ion distribution, photosynthetic capacity, and carbohydrate metabolism were investigated in soybean (Glycine max (L.) Merr. cvs Bragg (salt sensitive) and Ransom (salt semi-tolerant)). Plants were grown in aerated nutrient solution supplemented with 0 to 100 mM NaCl.;The concentrations of Na;Salinity severely reduced net photosynthesis (Pn) in Bragg but did not significantly affect Pn of Ransom. Pn reduction in Bragg was associated with accumulation of Na;Proline did not accumulate in Ranson leaves; and, although it did in Bragg, accumulation seemed a response to rather than an alleviator of injury. Ransom leaf solute potential was maintained about 1.1 MPa below solution water potential; whereas that of Bragg declined much more rapidly. The latter resulted primarily from salt accumulation, proline having little effect. |
