Figure 4.

Interactive effects of IAA and H₂O₂ on mRNA abundances of rbsL, rbcS, and RCA, and protein levels of rbsL and RCA in cucumber seedlings under chilling stress. (a–c) mRNA abundances of rbcL, rbcS, and RCA; (d) Pn; (e) Protein levels of rbcL and RCA; (f) Image of F_v/F_m and Φ_PSII. The false color code depicted at top of the image represents the degree of photoinhibition at PSII. Cucumber seedlings were pretreated with 75 μM IAA, 1.0 mM H₂O₂, 5.0 mM DMTU +75 μM IAA, 50 μM NPA +1.0 mM H₂O₂, or deionized water (control) for 24 h, and subsequently exposed to 5 °C for 24 h. The data represent the mean ± SD of three biological replicates. Different letters indicate significant differences (p < 0.05), according to Duncan’s new multiple range test.