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Accumulation of ABA and H2O2 in leaves of grafted or self−grafted cucumber plants. (a) ABA content, NCED activity, and its mRNA abundance, respectively. The plants were treated at 5 °C for 0 h and 12 h. (b) H2O2 accumulation and RBOH1 mRNA abundance, respectively. The plants were treated at 5 °C for 0 h and 6 h. Data are presented as the means ± SD (n = 3). Different letters indicate a statistical significance between samples at p < 0.05.
