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ups1 , an Arabidopsis thaliana camalexin accumulation mutant defective in multiple defence signalling pathways
Author(s) -
Denby Katherine J.,
Jason Laure J.M.,
Murray Shane L.,
Last Robert L.
Publication year - 2005
Publication title -
the plant journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.058
H-Index - 269
eISSN - 1365-313X
pISSN - 0960-7412
DOI - 10.1111/j.1365-313x.2005.02327.x
Subject(s) - jasmonic acid , arabidopsis thaliana , pseudomonas syringae , arabidopsis , mutant , biology , signal transduction , microbiology and biotechnology , salicylic acid , reactive oxygen species , biochemistry , gene
Summary We report the characterization of an Arabidopsis thaliana mutant, ups1 , isolated on the basis of reduced expression of phosphoribosylanthranilate transferase, a tryptophan biosynthetic enzyme. ups1 also exhibits defects in a wide range of defence responses. After infection with Pseudomonas syringae or Botrytis cinerea , the expression of genes regulated by both the salicylic acid and jasmonic acid/ethylene pathways is reduced in ups1 compared with wild type. Camalexin accumulation in ups1 is greatly reduced after infection with these two pathogens, as well as after amino acid starvation or oxidative stress. Reactive oxygen species (ROS)‐mediated gene expression is also compromised in ups1 indicating that this mutant is defective in signalling pathways activated in response to both biotic and abiotic stress. The fact that all three major defence signalling pathways are disrupted in ups1 , together with the oxidative stress phenotype, leads us to suggest that UPS1 is involved in ROS signal transduction.