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Effect of different CO2 concentrations (390, 545 and 700 μmol mol−1) on net photosynthesis (a), stomatal conductance (b), transpirational water loss (c), intercellular CO2 concentration (d) and water use efficiency (e) of Cannabis sativa varieties namely HPM, K2, MX and W1. Values within the same panel followed by the same letter are not significantly different at p < 0.05
