In the experiment, Solanum diphyllum, Solanum nigrum, Solanum nigrum humile and Solanum alatum as the rootstocks and eggplant seedlings as the scions, and the effects of different Solanum rootstocks on photosynthetic pigment contents and antioxidant enzyme activities of eggplant seedlings were studied. The results showed that S. nigrum as the rootstock increased the content of chlorophyll a, chlorophyll b and total chlorophyll of eggplant seedlings, and other treatments decreased the value of the above indicators or had no effects on them. All the Solanum rootstocks increased the content of carotenoid. Compared to ungrafted, the content of total chlorophyll and carotenoid of eggplant seedlings with S. nigrum as rootstock were the highest, which increased by 7.91% and 45.71%. Different Solanum rootstocks had different effects on the antioxidant enzyme activities of eggplant seedlings, but in general, Solanum rootstocks increased the antioxidant enzyme activities of eggplant seedlings. In conclusion, S. nigrum as the rootstock increased the antioxidant enzyme activities of eggplant seedlings while increasing its chlorophyll content, which was conducive to the growth of eggplant seedlings.
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.
The effects of Solanum melongena grafting with four different types of Solanum (Solanum diphyllum, Solanum nigrum, Solanum nigrum humile, Solanum alatum) on the biomass and cadmium content of S. melongena were studied by a pot experiment. The results showed that the effects of different treatments on root, rootstock stem, scion stem, scion leaves and whole scion biomass were all smaller than the ungrafted. The whole scion biomass of the treatment ungrafted were 2.67, 2.10, 4.50 and 3.49 times as much as the treatmensts S. melongena grafted with S. diphyllum, S. melongena grafted with S. nigrum, S. melongena grafted with S. nigrum humile, and S. melongena grafted with S. alatum. However, the effects of different treatments on the above indicators cadmium content trends were different. The cadmium content of root and rootstock stem of S. melongena grafted with S. nigrum humile were higher than control, but lower than other three treatments, but the cadmium content of scion stem, scion leaves and whole scion were lowest of all treatments. In conclusion, grafting will affect the growth and absorption of cadmium in S. melongena when it grafted with four different types of Solanum and on the whole, the trentment of S. melongena grafted with S. nigrum humile is the best.
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