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Relative growth rates and ion concentrations. (a) Relative growth rates (RGRs) for Pokkali and IR20 in the presence and absence of 50 mM NaCl. (b) Na+ contents in root and shoot tissue of Pokkali and IR20 grown in the presence of 50 mM NaCl for 4 d. (c) K+:Na+ ratios for Pokkali and IR20 root and shoot tissue. (d) K+ and Na+ concentrations in the xylem sap of salt-grown Pokkali and IR 20.
