3.4.6. Changes in Endogenous SL

The SL content presented a continuous decreasing trend (Figure 3F). In the initiation period, ABT-1—1000 mg·L−<sup>1</sup> showed the highest SL content at 92.6 ng·g−1. The most notable trend of ABT-1—1000 mg·L−<sup>1</sup> was observed during the callus formation, suggesting that high concentrations of ABT-1 could increase SL content. After callus formation, the SL content of ABT-1—1000 mg·L−<sup>1</sup> did not change obviously, indicating that ABT-1— 1000 mg·L−<sup>1</sup> could stabilize the SL content earlier.
