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Molecular Cell Biology: Are Reactive Oxygen Species Regulators of Leaf Senescence?

  • Ulrike Zentgraf
  • Vera Hemleben
Chapter
Part of the Progress in Botany book series (BOTANY, volume 69)

Senescence processes can influence many important agricultural traits; however, our knowledge concerning regulatory mechanisms controlling senescence is still limited. Free radicals are thought to play an essential role in senescence, especially those derived from oxygen. In addition to their deleterious functions, they might serve as signalling molecules. The critical balance between production and scavenging of reactive oxygen species (ROS), which normally is very tightly regulated, appears to be specifically disrupted during the progression of senescence in different cellular compartments either by depletion of antioxidants or excess production of ROS. Hydrogen peroxide (H2O2) is very likely the most important ROS. In contrast to other ROS, it has a relatively long half-life and can also pass membranes; therefore, it can be assumed that it executes signalling functions. Hydrogen peroxide is produced in different cell compartments but can also be released into the cytosol or vice versa. The role of ROS originating from different cellular compartments like chloroplasts, peroxisomes or mitochandria is discussed here with respect to senescence.

Keywords

Jasmonic Acid Leaf Senescence Alternative Oxidase Oxidative Stress Tolerance Molecular Cell Biology 
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.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2008

Authors and Affiliations

  • Ulrike Zentgraf
    • 1
  • Vera Hemleben
    • 1
  1. 1.ZMBP, General GeneticsUniversity of TübingenTübingenGermany

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