Relationship of Plasma Membrane Redox Activity to Proton Transport in Roots of Iron-Deficient Cucumber

  • E. Alcántara
  • M. D. de la Guardia
Part of the NATO ASI Series book series (NSSA, volume 7)


Under iron deficiency, cucumber (Cucumis sativus L. cv. Pickler) plants respond with a great increase in the capacity to reduce ferric chelates at their root surface and with an acidification of the root medium. The transmembrane e transfer to extracellular e acceptors is associated with a H+ efflux which should be differentiated from the one induced by iron deficiency without the need of an extracellular electron acceptor. In the last years diverse plasma membrane redox systems have been studied. In some cases the ratio e/H+ efflux during the reduction process has been established. For instance, le/1H+ in isolated mesophyll cells of Asparagus sprengeri Regel (1) or 2e/lH+ in roots of iron deficient Phaseolus vulgaris L. (3). However, Rubinstein and Stern (2) have shown in roots of Zea mays L. a redox system which involves only the transport of e across the plasmalemma. In this case H+ efflux is an indirect effect of the depolarization of the membrane potential, causing the activation of the membrane H+-ATPase.


Iron Deficiency Reduction Process Root Surface Redox System Cucumber Plant 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


  1. 1.
    Neufeld, E. and A.W. Bown. 1987. Plant Physiol. 83, 895–899.PubMedCrossRefGoogle Scholar
  2. 2.
    Rubinstein, B. and A.I. Stern. 1986. Plant Physiol. 80, 805–811.PubMedCrossRefGoogle Scholar
  3. 3.
    Sijmons, P.C., F.C. Lanfermeijer, A.H. de Boer, M.B.A. Prins, and H.F. Bienfait. 1984. Plant Physiol. 76, 943–946.PubMedCrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1988

Authors and Affiliations

  • E. Alcántara
    • 1
  • M. D. de la Guardia
    • 1
  1. 1.Dpto. de Agronomia, Escuela de Ingenieros AgrónomosUniversidad de CórdobaCórdobaSpain

Personalised recommendations