Influence of silicon pretreatment on aluminium toxicity in maize roots

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The influence of Si pretreatment on Al toxicity in an Al sensitive maize variety (Zea mays L. var. BR 201 F) was investigated using root elongation rates (RER) and hematoxylin staining as stress indicators. Plants pretreated with 1 mM Si (+ Si) and then exposed for 24 h to Al in nutrient solution without concurrent Si supply in the rooting medium exhibited higher PER than plants that were not pretreated with Si (-Si). The ameliorative effect of Si was due to lower Al uptake and to the exclusion of Al from the root tips in + Si plants. Lower Al uptake in + Si plants was not a consequence of decreased Al availability in the bulk solution. The possible mechanisms of Si-induced increase of Al resistance are discussed.
Original languageEnglish
Pages (from-to)203-209
JournalPlant and Soil
Publication statusPublished - 1 Jan 1997


  • Aluminium toxicity
  • Hematoxylin staining
  • Root elongation
  • Silicon
  • Zea mays L.

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