3.4.7. Changes in Endogenous IBA

After cuttings, the IBA content exhibited a gradual decreasing trend among groups (Figure 3G). ABT-1—1000 mg·L−<sup>1</sup> presented the highest IBA content in the initiation period (35.0 ng·g−1). During callus formation, both the treatment and control groups showed a decreasing trend, with ABT-1—500 mg·L−<sup>1</sup> exhibiting the greatest decrease in IBA content. During adventitious root formation and elongation period, ABT-1—500 mg·L−<sup>1</sup> did not show obvious change, while ABT-1—1000 mg·L−<sup>1</sup> presented a larger magnitude of change.
