Fig. 4. Cumulative net NO^-₃ uptake by roots of Pima cotton grown in 0.1 mM NO^-₃ for 4 d and pretreated with 0.02 mM NO^-₃ for 6 h. Control seedlings were left in 0.1 mM NO^-₃ (A), while pretreated seedlings (B) were placed in 0.02 mM NO^-₃ for 6 h. Net NO^-₃ uptake was measured in the presence of 0.1 mM NO^-₃ ± 10 mM NH⁺₄. Initial root NO^-₃ concentrations were 52.6±1.5 (control) and 47.2 ± 1.5 (pretreated) µmol g^-1 FW. Results are from a representative experiment.

Return to article