Article

Plant and Soil

, Volume 143, Issue 1, pp 55-60

First online:

Plant-induced changes in the redox potentials of rice rhizospheres

  • H. FlessaAffiliated withLehrstuhl für Bodenkunde, Technische Universität München-WeihenstephanInstitut für Bodenkunde und Standortslehre, Universität Hohenheim
  • , W. R. FischerAffiliated withLehrstuhl für Bodenkunde, Technische Universität München-WeihenstephanInstitut für Bodenkunde und Standortslehre, Universität Hohenheim

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Abstract

Redox potentials in microsites of the rhizosphere of flooded rice were continuously measured for several days. Close to the root tips redox potential markedly increased. The highest increase was measured in the rhizosphere of the tips of short lateral roots. Aerobic redox conditions were reached there, except in a very strongly reduced soil. Both the extension of the oxidation zone around the root tips and the maximum redox potential reached were influenced by the reducing capacity of the soil. The radius of the redox rhizosphere varied from less than 1 mm in a strongly reduced soil up to 4 mm in a weakly reduced one. The root-induced oxidation processes in the rhizosphere depended on the atmospheric oxygen supply to the roots.

Key words

oxidizing power platinum microelectrode rice rhizosphere soil reducing capacity