Figure 7.

Effect of exogenous calcium (Ca²⁺) and a calmodulin inhibitor (TFP) on thylakoid membrane activity in peanut leaves after 5 days of low nocturnal temperature (LNT) stress. (A) Rapid kinetics of P515 induced by saturating single turnover flashes in peanut leaves after dark acclimation for 1 h; (B) Fast kinetics of P515 induced by saturating single turnover flashes in peanut leaves after pre-illumination for 10 min at 600 μmol photons·m⁻²·s⁻¹ followed by 4 min darkness; (C) Proton gradient (△pH) and (D) membrane potential (△ψ) by using the slow ‘dark–light–dark’ signal induction transients of 515 nm signal after fully dark-acclimated (12 h). Values are means of three biological replicates ± SE (n = 3). * and ** indicate significant differences at P ≤ 0.05, and P ≤ 0.01, respectively, among the treatments. The significance between the three treatments under LNT and CK at 5 DoT was shown in parenthesis.