Effects of iron and manganese plaques on aluminum uptake and translocation by rice seedlings
2010
LI Fang | XING Cheng-hua | CAI Miao-zhen | ZHANG Shu-na | WU Shao-hui
A hydroponic experiment was conducted to investigate the influence of iron and manganese plaque on Al uptake and accumulation of Feiyouduoxi No.1 (Al-resistant rice cultivar) and Hongliangyou 166 (Al-sensitive rice cultivar). The formation of iron plaque, manganese plaque and iron/manganese plaque was induced by exposing the rice roots to 0.8 mol·L<sup>-1</sup> Fe<sup>2+</sup> or Mn<sup>2+</sup>, and the quantity of iron plaque was much more than that of manganese plaque. Most Fe was found in mixture of iron/manganese plaque, while Mn was much less and only accounted for 0.12%-0.20% of the total. Relative root elongation rate of rice seedlings under Al toxicity showed the following rank order: manganese plaque>iron/manganese plaque>iron plaque>no plaque. Al contents and accumulation in whole rice seedlings showed the following rank order: root surface with plaque>root>shoot. Ninety-one percent and eighty-five percent of Al was present in the root surface plaque of Al-tolerant Feiyouduoxi No.1 and Al-sensitive Hongliangyou 166, respectively, indicating that Al-resistant cultivar was more efficient to exclude Al from root and reduce the translocation of Al from root to shoot. Manganese plaque exerted more pronounced effect in Al tolerance.
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