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(A) Net photosynthetic rate, PN (μmol CO2 m−2 s−1), (B) stomatal conductance, gs (mmol m−2 s−1), (C) intercellular CO2 concentration, Ci (μmol mol−1), and (D) water use efficiency, WUE (μmol CO2 mmol−1 H2O) of Mentha arvensis cultivar “Kushal” grown under 50 and 100 μm Cd levels and primed with or without salicylic acid. Data are presented as treatments mean ± SE (n = 5). Data followed by the same letters are not significantly different by Duncan multiple range test at p ≤ 0.05.
