Fig. 4: Overexpression of IbPSS1 in sweet potato roots alters Ca²⁺ flux kinetics in response to NaCl and H₂O₂ stimuli.

a Effects of NaCl stress (150 mM) on transient net Ca²⁺ flux kinetics in the elongation zone (2 mm from the tip) of the TRs and ARs. n = 9 from five individual seedlings. The columns in the insert show the mean rates of Ca²⁺ flux during the later period of NaCl stress (~10 min). “**” denotes significant differences at P < 0.01. b Effects of H₂O₂ (10 mM) on transient net Ca²⁺ flux kinetics in the elongation zones (2 mm from the tip) of the TRs and ARs. n = 12 from six individual seedlings. The columns in the insert show the mean Ca²⁺ flux rates during the H₂O₂ treatment (~20 min). “**” denotes significant differences at P < 0.01.