Ameliorative Effect of Silicon on Aluminum Injury in the Rice Plant

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Rice (cv: Koshihikari) plants were subjected to water-culture during 3 or 4 d with Al (0.2 and 0.8 mM) and low molecular Si (3.0 mM) or high molecular Si (3.0 mM low molecular Si+21.7 mM high molecular Si) in a 0.5 mM Ca (NO_3)_2 solution in order to evaluate the ameliorative effect of silicon (Si) on Al injury. The concentration of monomer Al in the culture solution without plants decreased with time and was 65-75% of its original value at 54 h after low or high molecular Si was added. Root and plant growth was inhibited by the single Al treatment, but improved by the addition of silicon, especially high molecular Si. The total Al content in the roots and shoots was highest when low molecular Si was added in the presence of Al, followed by a single Al treatment and the addition of high molecular Si. The total Si content in the roots increased by the addition of high rather than low molecular Si irrespective of the Al treatment. The content of water-soluble polymer Al in the roots and leaves increased by the addition of low molecular Si, and the content of water-soluble monomer Al in the leaves decreased. These results suggest that the ameliorative effect of Si on Al injury is attributable not only to the decrease of Al concentration by Si in the culture solution but also to the changes of the Al chemical forms in the solution and plant by Si.
社団法人日本土壌肥料学会の論文