Localization of absorbed aluminium in pea root and its binding to nucleic acids

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概要

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• Aluminium (Al^<3+>) considerably inhibited the root elongation of Alaska pea at concentrations higher than 10^<-4> M and pH 4.5. The absorbed Al^<3+> in roots was localized in the epidermis and regions where cells actively divided, such as root tip and differentiating lateral root. In cells, Al^<3+> accumulated mainly in the nuclei and walls. Al^<3+> in nucleic acids increased up to 24 hr after treatment with 10^<-3>M AlCl_3, and did not decrease markedly after transfer of 10-hr treated plants to water. Molecular sieving chromatography showed that Al^<3+> in nucleic acids associated preferentially with DNA. However, in vitro association of Al^<3+> with DNA and RNA was nearly the same. When Al^<3+> and nucleic acid were mixed in vitro, the molecules of Al^<3+> being adjusted to be equal to those of phosphorus in nucleic acid. only 25% of the Al^<3+> associated with nucleic acid. The presence of NaCl up to 0.4 M and MgCl_2 up to 0.05 M increased the association of Al^<3+> with DNA. When the phosphorus in DNA was masked by histone, the association of Al^<3+> with DNA was considerably reduced.

• 日本植物生理学会の論文

著者

• MATSUMOTO H.

  Department of Physics, University of Alberta

• TAKAHASHI E.

  Department of Agricultural Chemistry, University of Kyoto

• Torikai H.

  Department Of Agricultural Chemistry Kyoto University

• Hirasawa E.

  Department of Agricultural Chemistry, Kyoto University

• Hirasawa E.

  Department Of Agricultural Chemistry Kyoto University

• Matsumoto H.

  Department of Applied Physics, Seikei University:(Present address)Institute of Physics, Univ. of Tsukuba

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