章艺, 刘鹏, 宋金敏, 徐根娣, 蔡妙珍, 崔洁晨. 水稻根尖铁的积累及附着形态研究[J]. 中国生态农业学报(中英文), 2009, 17(5): 929-932. DOI: 10.3724/SP.J.1011.2009.00929
引用本文: 章艺, 刘鹏, 宋金敏, 徐根娣, 蔡妙珍, 崔洁晨. 水稻根尖铁的积累及附着形态研究[J]. 中国生态农业学报(中英文), 2009, 17(5): 929-932. DOI: 10.3724/SP.J.1011.2009.00929
ZHANG Yi, LIU Peng, SONG Jin-Min, XU Gen-Di, CAI Miao-Zhen, CUI Jie-Chen. Forms and accumulation of iron at rice root tip[J]. Chinese Journal of Eco-Agriculture, 2009, 17(5): 929-932. DOI: 10.3724/SP.J.1011.2009.00929
Citation: ZHANG Yi, LIU Peng, SONG Jin-Min, XU Gen-Di, CAI Miao-Zhen, CUI Jie-Chen. Forms and accumulation of iron at rice root tip[J]. Chinese Journal of Eco-Agriculture, 2009, 17(5): 929-932. DOI: 10.3724/SP.J.1011.2009.00929

水稻根尖铁的积累及附着形态研究

Forms and accumulation of iron at rice root tip

  • 摘要: 以铁毒耐性水稻(Oryza sativa L.)品种“9308”为材料, 利用火焰原子吸收光谱法和化学浸提法研究0~10 mm段水稻根尖铁的积累及附着形态。结果表明: 高Fe2+(400 mmol·L-1)胁迫下, 0~2 mm段水稻根尖铁含量最高; 随着Fe2+浓度的升高, 根边缘细胞铁含量也明显增大; 初生根上不同形态铁的含量为铁锰氧化物态>残渣态>有机态>可交换态>碳酸盐态。以上结果表明, 水稻根尖0~2 mm段是过量铁的主要作用位点, 铁的附着形态以紧密结合态为主, 包围在外的根边缘细胞能固定过量铁。

     

    Abstract: To explore the forms and accumulation of iron at root tips in rice (Oryza sativa L.) under Fe2+ toxicity stress, iron-tolerant rice variety “9308” was germinated under laboratory conditions and the seedlings were treated with various Fe2+ concentrations (0~400 μmol·L-1). The content and forms of iron at 0~10 mm root tips were measured via Flame Atomic Absorption Spectrometric and sequential extraction. Under 400 μmol·L-1 Fe2+ stress, iron content in 0~2 mm root tip is highest, while that in root border cells increases with increasing Fe2+ concentration. The order of contents of various forms of iron in primary root is Fe-Mn oxide combined form > residual form > organometallic compound > exchangeable form> carbonate-bound form. This finding indicates that the 0~2 mm rice root tip is the main acting site of Fe2+ toxicity. Most of the irons are tightly bounded in the 0~10 mm root tip. This reduces iron phyto-availability, enabling root border cells to fix up excessive Fe2+.

     

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