Saturday, 15 July 2006

Reduction of cadmium content in Eggplant (Solanum melongena) by grafting onto root stock Solanum torvum.

Tomohito Arao1, Hiroyuki Takeda2, Eiji Nishihara2, and Takashi Nakano2. (1) National Institute for Agro-Environmental Sciences, 3-1-3 Kannondai, Tsukuba, Ibaraki, 305-8604, Tsukuba, Japan, (2) Niigata Horticultural Research Center, 177 Mano, seirou Niigata 957-011, seirou, Japan

A safety criterion of 0.05 mg kg-1 has been agreed for cadmium concentration for Fruiting vegetables (THE 28th SESSION OF THE CODEX ALIMENTARIUS COMMISSION, Roma, Italy, 4 July 9 July 2005). About seven percent in 381 samples of eggplant (Solanum melongena) cadmium concentration was above this limit in the field and market basket study in Japan. To reduce cadmium concentration, we grafted eggplant onto root stock Solanum torvum, Solanum integrifolium, Solanum sanitwongsei, and Solanum integrifolium x S. melongena. Cadmium concentration of eggplant was lowest grafting onto root stock S. torvum. Fig. 1 shows Cadmium concentration of eggplant grafted onto S. torvum or S. melongena (3 replications each), growing on cadmium polluted gray lowland soil (0.1 mol l-1 HCl-extractable cadmium 2.9mg kg-1). Grafting onto S. torvum reduced eggplant cadmium concentration about one fourth. Stem and leaves cadmium concentration was also low when eggplant was grafted onto S. torvum, so cadmium translocation from roots to shoots was reduced. We are now growing eggplant on solution containing cadmium to measure root cadmium concentration.

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