Figure 3.

Involvement of SA in grafting-induced chilling tolerance. Plants with three leaves were pretreated with 1.0 mM SA, 30 μM AIP, 0.1 mM AOPP, or deionized water (H₂O, control) for 24 h and then exposed to chilling stress. (a) Phenotype of Cs/Cm plants after chilling treatment for 0 h and 72 h. (b) Electrolyte leakage of the Cs/Cs and Cs/Cm plants after being treated at 5 °C for 0 h and 48 h. (c) Chilling injury index of Cs/Cs and Cs/Cm plants treated at 5 °C for 72 h. (d,e) Relative mRNA expression of CBF1 and COR47 of Cs/Cs and Cs/Cm plants treated at 5 °C for 0 h and 24 h. Data are presented as the means ± SD (n = 3). Different letters indicate a statistical significance between samples at p < 0.05.