Abstract
Pea (Pisum sativum cv. Argenteum) plants were exposed to nutrient culture solutions supplemented with 0, 50, 100, and 200 mM NaCl. Within 2 h after initial exposure, significant increases in Na concentration were observed within the apoplast of mesophyll tissue from fully expanded leaflets, as determined by elution analysis. Estimated apoplastic Na contents at 6 h ranged from 1.8 to 6.9 μmol Na/g fr wt with the highest contents in leaflets from plants placed in 100 and 200 mM NaCl. Osmotic potentials of expressed sap from leaflets declined from -0.82 MPa at 0 time to -0.92 and -1.14 MPa by 3 h for the 50 and 100 mM NaCl treatments, respectively. K concentrations within the mesophyll apoplast were also found to increase within the short term in response to increasing nutrient solution NaCl concentrations. The potential short. term osmotic effects of apoplastic ion accumulation within leaf mesophyll tissue under saline conditions will be discussed.
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