Figure 6.

Effect of exogenous calcium (Ca²⁺) and a calmodulin inhibitor (TFP) on peanut photosynthetic electron transport during 5 days of low nocturnal temperature (LNT) stress followed by 5 days of recovery. (A) ETR(II): PSII photosynthetic electron transport rate; (B) CEF: cyclic electron flow around PSI; (C) ETR(I): PSI photosynthetic electron transport rate; (D) Y(CEF)/Y(II): the ratio of quantum yield of CEF to Y(II). 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.