Resistance to excess HCO₃⁻ treatment or Zn deficiency under Zn and HCO₃⁻ interaction.

Note: The criterion index was expressed by # in terms of Ai: #, very sensitive; # #, sensitive; # # #, weak; # # # #, medium; and # # # # #, strong. Under excess HCO3−, the Ai of biomass, PN (WUE, gs) and ETR (Fv/Fm, Chl content) were more than 20%, 0 and 0, respectively, when the criterion index was # # # # #; 5~20%, -15~0%, and -10~0%, respectively, when the criterion index was # # # #; -15~5%, -30~-15%, and -20~-10%, respectively, when the criterion index was # # #; -30~-15%, -30~-45%, and -30~-20%, respectively, when the criterion index was # #; and less than -30%, -45% and -30%, respectively, when the criterion index was #. Under Zn deficiency, the Ai of biomass, PN (WUE, ETR, Fv/Fm) and Chl content were more than -10%, -15% and 0 when the criterion index was # # # # #; -20~-10%, -25~-15%, and -10~0, respectively, when the criterion index was # # # #; -30~-20%, -35~-25%, and -20~-10%, respectively, when the criterion index was # # #; -40~-30%, -45~-35%, and -30~-20%, respectively, when the criterion index was # #; and -40%, -45% and -30%, respectively, when the criterion index was #.