Identification of Arabidopsis thaliana elements involved in oligogalacturonide signaling
Author(s)
Gravino, Matteo
Date Issued
May 30, 2014
Type
Doctoral Thesis
Abstract
During pathogen infection or after injury, homogalacturonan (HGA), a major component of pectin in
the plant cell wall, is broken down into oligogalacturonide (OGs) fragments that act as damageassociated
molecular patterns (DAMPs) and activate the plant immune response. Analysis of transcript
profiles and mitogen-activated protein kinase (MAPK) activity revealed an extensive overlap between
early responses triggered by OGs and those induced by bacterial pathogen-associated molecular
patterns (PAMPs). Both OGs and PAMPs regulate also developmental responses, likely due to their
ability to antagonize auxin. So far, several elements involved in early PAMPs signalling have been
identified, for example BRASSINOSTEROID INSENSITIVE1-ASSOCIATED KINASE1/SERK3
(BAK1/SERK3), BAK1-LIKE1/SERK4 (BKK1/SERK4), Calcium-dependent Protein Kinases
(CPKs), but their involvement in OG signalling has not yet been investigated. Moreover, another class
of endogenous elicitors, known as Arabidopsis peptides or Atpeps, and their specifics receptors,
PEPR1 and PEPR2, was recently demonstrated to amplificate PAMPs responses. I have therefore
analyzed whether transduction components are shared by the PAMP- and OG-activated pathways. My
results suggest that DAMP and PAMP signals act, at least in part, through the same transduction
elements.
Additional information
Dottorato di ricerca in Biotecnologie vegetali
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