Alleviating Selenite Stress in Grapevines Through Strigolactone and Dopamine-Induced Growth and Selenium Uptake

To alleviate selenium (Se) stress in grapes, we investigated the effects of the strigolactone analog GR24 (1 μmol/L) and dopamine (DA, 100 μmol/L) on the growth and Se uptake of grapevines under selenite stress (0.5 mg/L). Se treatment inhibited grapevine growth, indicating that Se induced stress in grapevines. Under Se stress, both GR24 and DA treatments increased growth parameters and photosynthetic capacity. In addition, they enhanced peroxidase activity, soluble protein content, and soluble sugar content. Furthermore, both GR24 and DA treatments reduced Se content in grapevines. Compared to Se treatment, GR24 reduced root and shoot Se contents by 4.63% and 25.04%, respectively, while DA decreased root Se content by 7.49% but did not significantly affect shoot Se content. Regarding the translocation factor, GR24 treatment decreased this value, while DA treatment increased it under Se stress. In summary, both GR24 and DA treatments can alleviate selenite stress, promote growth, and exhibit potential in reducing Se uptake in grapevines.