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.
Показать больше [+] Меньше [-]Ключевые слова АГРОВОК
Библиографическая информация
Эту запись предоставил Directory of Open Access Journals