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Related Experiment Videos

pH regulation in anoxic plants.

Hubert H Felle1

  • 1Botanisches Institut I, Justus-Liebig-Universität Giessen, Senckenbergstrasse 17, D-35390 Giessen, Germany. Hubert.Felle@bio.uni-giessen.de

Annals of Botany
|July 19, 2005
PubMed
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Cells under anoxia rapidly acidify, but this pH change is regulated to maintain enzyme function and energy production. This regulated anoxic pH is not reversed to aerobic levels, even in anoxia-intolerant tissues.

Area of Science:

  • Plant Physiology
  • Cellular Respiration
  • Biochemistry

Background:

  • Cellular anoxia triggers an energy crisis, leading to rapid cytoplasmic acidification.
  • Anoxia tolerance varies, influencing the duration of pH stability before further drops and cell death.
  • pH regulation involves complex interactions of ion transport, buffering, and metabolic reactions.

Purpose of the Study:

  • To review the origins and regulation of pH changes during anoxia.
  • To examine how plant tissues manage energy crises under anoxia.
  • To assess the role of pH regulation and membrane transport in vacuole and apoplast dynamics.

Main Methods:

  • Literature review on cellular anoxia and pH regulation.
  • Discussion of energy crisis management in plant tissues.

Related Experiment Videos

  • Analysis of transmembrane transport and vacuolar/apoplastic pH.

    • Main Results:

    • Initial cytoplasmic acidification under anoxia is not primarily due to energy shortage.
    • A new, regulated pH is established under anoxia to optimize enzyme function for energy production.
    • Residual H+ pumping is crucial for energy production by importing compounds, but not for pH regulation itself.

    Conclusions:

    • The anoxic pH is a regulated state, not an error signal, and is not reversed to aerobic levels.
    • Anoxia-tolerant tissues may maintain a higher cytoplasmic pH, but pH regulation is not necessarily impeded in intolerant tissues.
    • Subsequent acidosis and gradient breakdown damage cells but may not be the primary event initiating cell death under anoxia.