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Exogenous BL induces petiole growth in carrot. 40 days after sowing plants were treated with different concentrations of BL (0, 0.1, 0.5 and 1 mg/L). (A) Root length, overall length, and root width; (B) root weight and aerial part (petioles and leaf blades) weight; (C) the number of petioles. Student’s t-test was used to identify the differences under different treatments (P < 0.05; ∗, control versus treatment). Error bars represent standard deviation (SD).
