Transcriptional responses of Arabidopsis thaliana to the bacteria-derived PAMPs harpin and lipopolysaccharide

Immunobiology
Maren LivajaJörg Durner

Abstract

Many plant-pathogen interactions are controlled by specific interactions between pathogen avirulence (avr) gene loci and the corresponding plant resistance R locus (gene-for-gene-hypothesis). Very often, this type of interaction culminates in a hypersensitive reaction (HR). However, recently pathogen-associated molecular patterns (PAMPs) such as flagellin or lipopolysaccharides (LPS) that are common to all bacteria have been shown to act as general elicitors of basal or innate immune responses in several plant species. Here, we summarize the genetic programs in Arabidopsis thaliana behind the LPS-induced basal response and the HR induced by harpin, respectively. Using Agilent Arabidopsis cDNA microarrays consisting of approximately 15,000 oligomers, changes in transcript accumulation of treated cells were monitored over a period of 24h after elicitor treatment. Analysis of the array data revealed significant responses to LPS (309 genes), harpin (951 genes) or both (313 genes). Concentrating our analysis on the genes encoding transcription factors, defence genes, cell wall biogenesis-related genes and signal transduction components we monitored interesting parallels, but also remarkably different expression patterns. Harpin and ...Continue Reading

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