Figure 5.

Effect of exogenous calcium (Ca²⁺) and a calmodulin inhibitor (TFP) on peanut photosystems parameters during 5 days of low nocturnal temperature (LNT) stress followed by 5 days of recovery. (A) Y(II): PSII photochemistry effective quantum yield; (B) Y(NPQ): PSII regulated energy dissipation quantum yield; (C) Y(NO): PSII non-regulated energy dissipation quantum yield; (D) Y(I): PSI photochemistry effective quantum yield; (E) Y(ND): PSI non-photochemical energy dissipation due to the donor-side limitation; (F) Y(NA): PSI non-photochemical energy dissipation due to the acceptor-side limitation. 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 was shown in parenthesis.