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Ion exchange properties of roots and ionic interactions within the root apoplasm: Their role in ion accumulation by plants

Résumé

Lors de leur passage d’éléments nutritifs, en solution dans le sol, vers le mécanisme actif d’absorption, localisé a la surface symplasmique, les ions, absorbés au plasmalemma des cellules de racine, doivent en premier lieu passer à travers les espaces libres de la membrane cellulaire. Cet article discute les propriétés des racines au point de vue de l’échange de cations en termes d’intéractions ioniques à l’interieur de l’apoplasme racinaire et les conséquences de telles intéractions sur l’accumulation d’ions par la plante.

Les espaces libres dans la membrane cellulaire des racines sont considérés comme un libre continuum diffusible de la solution ionique externe, mais ses propriétés sont modifiées par les charges ioniques des substances localisées à l’intérieur de la matrice de la membrane cellulaire. Le rôle de ces espaces libres dans le transport radial des ions est examiné et les intéractions ioniques complexes qui se jouent a l’intérieur des espaces libres est discuté. Il est conclu que plus de recherche est nécéssaire pour élucider clairement le rôle des espaces libres dans l’accumulation des ions par les plantes. Cependant, les resultats indiquent que, sous certaines conditions expérimentales, les intéractions ioniques à l’intérieur des espaces libres des racines influencent qualitativement la composition ionique des plantes.

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Correspondence to R. J. Haynes.

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Haynes, R.J. Ion exchange properties of roots and ionic interactions within the root apoplasm: Their role in ion accumulation by plants. Bot. Rev 46, 75–99 (1980). https://doi.org/10.1007/BF02860867

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Keywords

  • Free Space
  • Cation Exchange Capacity
  • Botanical Review
  • Plant Soil
  • Monovalent Cation