Effects of Different Rootstocks on Phosphorus and Potassium Uptake in Eggplant Seedlings under Selenium Stress

Abstract

In the experiment, four new eggplant materials (“190-1-8”, “RS-2”, “RS-5” and “Qinqing”) and wild tomato were used as rootstocks, and eggplant “Fengshengjiaowang” was used as scion to study the effect of different rootstocks on the absorption of phosphorus and potassium by eggplant seedlings under selenium stress. The results showed that after grafting, the absorption of phosphorus in the roots of grafted eggplant seedlings was not significant overall. But grafting can significantly increase potassium uptake by roots of grafted eggplant seedlings. Grafting significantly reduced the content of phosphorus and potassium in scion stems. Phosphorus and potassium content in leaves and rootstock stems vary greatly according to the rootstock. In conclusion, the treatment of using RS-5 and Qinqing as the rootstocks had the best performance overall. For the treatment of using RS-5 as the rootstock, the phosphorus content in roots and leaves was 17.71% and 16.14% higher than that of control, respectively; and the potassium content in the roots and leaves increased by 24.02% and 6.62% compared with the control. For the treatment of using Qinqing as the rootstock, the leaves phosphorus content increased by 16.02% compared with the control, and the root potassium content was 43.20% higher than that of control. The contents of phosphorus and potassium in the rootstock and scion stems performed better than other grafting treatments.