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C, control seedlings; I, IAA-treated seedlings; A, ammonia-treated seedlings; B, YNA12-treated seedlings; and IAB, IAA-, ammonia-, and YNA12-treated seedlings. Different letters on the columns with error bars (mean ± standard deviation) represent significant differences among the treatments. The data were analyzed with a one-way ANOVA followed by Duncan multiple range test (p < 0.05).
