Fig. 6
Changes in photosynthesis parameters of plants with water stress time. a net photosynthesis rate (Pn); b stomatal conductance (Gs); c intracellular CO2 concentration (Ci); d stomatal limitation index (Ls) =1-Ci/Ca, Ca = 400 μmol·mol− 1 here; e non-stomatal limitation index = Ci/Gs. * and ** indicate significant differences between plants under treatment with PEG (PEG) and without PEG (CK) at the same time points of determination at P < 0.05 and P < 0.01 respectively. Values are means ± SE (n = 3)