3.5.3. Changes in Endogenous ZR

The ZR content presented a trend of decreasing before increasing (Figure 4C). After the initiation period, the ZR content of the treatments and control exhibited a decreasing trend, with a more obvious decrease exhibited in the treatment group. After callus formation, the ZR content in the control group was higher than that in the treatment groups, indicating that high ZR concentration has an inhibitory impact on adventitious root formation.
