FIGURE 1.

Effect of diethyl aminoethyl hexanoate (DA-6) treatment on chlorophyll and photosynthesis in tomato leaves under low night temperature. (A) Plant phenotype. (B) Chlorophyll content. (C) Carotenoid content. (D) Net photosynthetic rate (Pn). (E) Transpiration rate (Tr). (F) Intercellular CO₂ concentration (Ci). (G) Stomatal conductance (Gs). Data are the means of five replicates at 12 days with standard errors shown by vertical bars. Differences among treatments were analyzed by the one-way ANOVA comparison test (P < 0.05). Different letters indicate significant differences among treatments. CK, the plant grown at optimal temperature (28°C/18°C); LHT, the plant grown at low night temperature (28°C/6°C). LHT + DA-6, the plant pretreated with DA-6 and grown at LHT.