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Effect of IAA on the RBOH activity (a) and H2O2 accumulation (b) in cucumber seedlings. Cucumber seedlings were foliar sprayed with 75 μM IAA or deionized water (control), and then, we measured the changes of RBOH activity and H2O2 content within 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.
