Proteomics of the response of Arabidopsis thaliana to infection with Alternaria brassicicola.
We have studied the proteome of the model plant Arabidopsis thaliana infected with a necrotrophic fungal pathogen, Alternaria brassicicola. The Arabidopsis-A. brassicicola host-pathogen pair is being developed as a model genetic system for incompatible plant-fungal interactions, in which the spread of disease is limited by plant defense responses. After confirming that a defense response was induced at the transcriptional level, we identified proteins whose abundance on 2-DE gels increased or decreased in infected leaves. At least 11 protein spots showed reproducible differences in abundance, increasing or decreasing during the progress of the infection. The pathogenesis-related protein PR4, a glycosyl hydrolase, and the antifungal protein osmotin are strongly up-regulated. Two members of the Arabidopsis glutathione S-transferase (GST) family increased in abundance in infected leaves. The spots in which these GST proteins were identified contain additional members of the GST family. Representation of GST family members in several protein spots migrating at similar molecular weight suggests post-translational modifications. The signature of GST regulation may be specific for the type of plant-pathogen interaction. The proteomic view of the defense response to A. brassicicola can be compared with other types of plant-pathogen interactions, and to leaf senescence, identifying unique regulatory patterns.
Department of Biology, Technion - Israel Institute of Technology, Haifa 32000, Israel.
Arup K
AK
Mukherjee
Marie-Jeanne
MJ
Carp
Rina
R
Zuchman
Tamar
T
Ziv
Benjamin A
BA
Horwitz
Shimon
S
Gepstein
D000528:Alternaria / Q000235:genetics / Q000254:growth & development / Q000472:pathogenicity / Q000502:physiology*; D000935:Antifungal Agents / Q000378:metabolism; D017360:Arabidopsis / Q000235:genetics / Q000378:metabolism* / Q000382:microbiology*; D029681:Arabidopsis Proteins / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D015180:Electrophoresis, Gel, Two-Dimensional; D018506:Gene Expression Regulation, Plant; D005982:Glutathione Transferase / Q000378:metabolism; D006026:Glycoside Hydrolases / Q000378:metabolism; D054884:Host-Pathogen Interactions / Q000235:genetics / Q000502:physiology; D013058:Mass Spectrometry; D010935:Plant Diseases / Q000235:genetics / Q000382:microbiology*; D018515:Plant Leaves / Q000235:genetics / Q000378:metabolism / Q000382:microbiology; D011499:Protein Processing, Post-Translational / Q000235:genetics / Q000502:physiology; D040901:Proteomics; D020133:Reverse Transcriptase Polymerase Chain Reaction
D000935:Antifungal Agents; D029681:Arabidopsis Proteins; D005982:Glutathione Transferase; D006026:Glycoside Hydrolases