The potential physiological implications of polygalacturonic acid-mediated production of superoxide.

Journal Article

PGA/OGA/PF represent apoplastic signaling molecules implicated in the control of gene expression and the activity of enzymes involved in defense regulation. However, the underlying mechanisms behind such processes are lacking. Here we unequivocally show using EPR spectroscopy with DEPMPO spin-trap capable of differentiating between •OH and •O(2)(-) that PGA and PF can produce •O(2)(-) by transforming •OH. The potential physiological implications of this unique property are discussed. We propose that PGA/OGA/PF could represent the initiators of redox signaling cascades in stress response, with H(2)O(2) being a downstream secondary messenger.

Full Text

Duke Authors

Cited Authors

  • Spasojević, I; Pristov, JB

Published Date

  • December 2010

Published In

Volume / Issue

  • 5 / 12

Start / End Page

  • 1525 - 1529

PubMed ID

  • 21139441

Pubmed Central ID

  • 21139441

Electronic International Standard Serial Number (EISSN)

  • 1559-2324

International Standard Serial Number (ISSN)

  • 1559-2316

Digital Object Identifier (DOI)

  • 10.4161/psb.5.12.12838


  • eng