The Arabidopsis senescencE-associated gene 13 regulates dark-induced senescence and plays contrasting roles in defense against bacterial and fungal pathogens

Nikhilesh Dhar, Julie Caruana, Irmak Erdem, Krishna V. Subbarao, Steven J. Klosterman, Ramesh Raina

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

SENESCENCE-ASSOCIATED GENE 13 (SAG13) of Arabidopsis is a widely conserved gene of unknown function that has been extensively used as a marker of plant senescence. SAG13 induction occurs during plant cell death processes, including senescence and hypersensitive response, a type of programmed cell death that occurs in response to pathogens. This implies that SAG13 expression is regulated through at least two different signaling pathways affecting these two different processes. Our work highlights a contrasting role for SAG13 in regulating resistance against disease-causing biotrophic bacterial and necrotrophic fungal pathogens with contrasting infection strategies. We provide further evidence that SAG13 is not only induced during oxidative stress but also plays a role in protecting the plant against other stresses. SAG13 is also required for normal seed germination, seedling growth, and anthocyanin accumulation. The work presented here provides evidence for the role of SAG13 in regulating multiple plant processes including senescence, defense, seed germination, and abiotic stress responses. SAG13 is a valuable molecular marker for these processes and is conserved in multiple plant species, and this knowledge has important implications for crop improvement.

Original languageEnglish (US)
Pages (from-to)754-766
Number of pages13
JournalMolecular Plant-Microbe Interactions
Volume33
Issue number5
DOIs
StatePublished - May 2020

Keywords

  • Abiotic stress
  • Anthocyanin pigments
  • Biotic stress
  • Defense response
  • Disease resistance
  • Hypersensitive response
  • Programmed cell death
  • Reactive oxygen species
  • Senescence
  • Senescence-associated gene (SAG)

ASJC Scopus subject areas

  • Physiology
  • Agronomy and Crop Science

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