Reduction of cadmium concentration in eggplant (Solanum melongena) fruits by grafting with Solanum torvum rootstock
2007
Takeda, H.(Niigata-ken. Agricultural Research Inst., Seiro (Japan). Horticultural Research Center) | Sato, A. | Nishihara, E. | Arao, T.
Eggplant fruits in Japan tend to have higher cadmium concentrations than international maximum limits for fruiting vegetables. The purpose of this study was to identify rootstocks which reduce the cadmium concentrations in fruits of scions. 1) Grafting onto the Solanum torvum cultivars Torubamubiga-, Tonashimu, and Torero reduced cadmium concentrations of fruits of cv. Senryou2 (Solanum melongena) by about 1/2 to 3/4 compared with grafting onto cv. Daitarou (S. melongena) or self roots. 2) Cadmium concentrations of fruits of four different scions (S. melongena) grafted onto Torubamubiga- were about 1/2 to 1/4 of those of fruits on cv. Hiranasu (Solanum integrifolium) or self roots. 3) There was no clear correlation between fruit cadmium concentrations and fresh weight or water content. 4) Cadmium concentrations of fruits harvested earlier tended to be higher than those of fruits harvested later. Thus, cadmium concentrations of fruits at higher nodal positions tended to be lower than those of lower fruits. 5) There was no clear correlation between fruit cadmium concentration and stem thickness at the end of cultivation. In conclusion, we have developed a practical method for reducing the cadmium concentration of eggplant fruits by grafting onto S. torvum rootstock.
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