Article

Plant and Soil

, Volume 190, Issue 2, pp 203-209

First online:

Influence of silicon pretreatment on aluminium toxicity in maize roots

  • Isabel CorralesAffiliated withPlant Physiology Laboratory, Science Faculty, Autonomous University of Barcelona
  • , Charlotte PoschenriederAffiliated withPlant Physiology Laboratory, Science Faculty, Autonomous University of Barcelona
  • , Juan BarcelóAffiliated withPlant Physiology Laboratory, Science Faculty, Autonomous University of Barcelona

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Abstract

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 mt M Si (+ Si) and then exposed for 24 h to Al in nutrient solution without concurrent Si supply in the rooting medium exhibited higher RER 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

aluminium toxicity hematoxylin staining root elongation silicon t Zea mays L