Influence of Mercury on Soybean Plants (Glycine max L.) at Low pH

概要

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The influence of Hg on soybean plants under different pH conditions and Hg concentrations was studied. Growth inhibition by Hg was higher in roots than the upper part of the plant but was highly dependant on pH condition. Growth inhibition of roots was observed when Hg concentration was higher than 1mg Hg L^<-1> for pH 4.0 and 5mg Hg L^<-1> for pH 6.0. Using ^<203>Hg as a radioactive tracer, the amount of Hg (1mg Hg L^<-1>) uptake in root was found to be about 1.5 times higher at pH 4.0 than that at pH 6.0; suggesting that Hg when highly accumulated at the lower pH induced inhibition of root growth. Decreased amounts of Hg due to evaporation during the plant growth were very low, but were higher at pH 6.0 than that at pH 4.0. There was hardly any translocation of Hg from roots to the upper parts through the stem within 24h.
社団法人日本土壌肥料学会の論文