Is cytoplasmic pH involved in the regulation of cell cycle in plants?


  • Olivier Pichon,

    Corresponding author
    1. Laboratoire de Physiologie et Génétique Végétates, 4. rue Ledru, F-63038 Clermont-Ferrand Cede, France.
      O. Pichon (corresponding author)
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  • Marie-Odile Desbiez

    1. Laboratoire de Physiologie Inlegree de I'Arbre Fruitier, 4, rue Ledru, F-63038 Clermont-Ferrand Cedex. France.
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O. Pichon (corresponding author)


Modifications of cytoplasmic pH has biological significance in animal and plant cell development. Many observations suggest an important function of cytopiasmic pH in mitotic signalling in animal ceils. In Bidens pilosa cultivated under white light, acidification of cytoplasm, observed after mechanical trauma, is associated with an inhibition of DNA synthesis and a decrease in mitotic frequency. In contrast, in Bidens pilosa cultivated under blue light, mechanical stimulation induces an increase of cytoplasmic pH and stimulation of DNA duplication and mitotic activity. A correlation has been established between transient variations of cytoplasmic pH and rapid modification in cell development. The critical role of cytoplasmic pH in the regulation of the cell cycle in plants is discussed.