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Report No.

The Effects of rhizosphere pH on Cd uptake of soybean seedlings

Oya, Tomoyuki*; Rai, Hiroki*; Tanoi, Keitaro*; Iikura, Hiroshi  ; Nakanishi, Tomoko*

To study the effect of rhizosphere pH on the cadmium(Cd) uptake, soybean seedlings were grown for 4 days in 0.2 mM CaCl$$_{2}$$ solution containing 1 $$mu$$M Cd under pH 4.5 or pH 6.5 using $$^{109}$$Cd as a tracer. The concentration of Cd in root at pH 6.5 was 3.4 times higher than that at pH 4.5. Cadmium amount absorbed on root surface at pH 6.5 was 1.3 times higher than that at pH 4.5. With high accumulation of Cd in root, Cd toxicity such as brownish of the tissue and the suppression of lateral root development was only observed under pH 6.5 condition. Transpiration rate was found to have no relation to high accumulation of Cd in shoot.



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