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Esa1 , an Arabidopsis mutant with enhanced susceptibility to a range of necrotrophic fungal pathogens, shows a distorted induction of defense responses by reactive oxygen generating compounds
Author(s) -
Tierens Koenraad F. M.J.,
Thomma Bart P. H. J.,
Bari Rajendra P.,
Garmier Marie,
Eggermont Kristel,
Brouwer Margreet,
Penninckx Iris A. M. A.,
Broekaert Willem F.,
Cammue Bruno P. A.
Publication year - 2002
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 - 10.1046/j.1365-313x.2002.01199.x
Subject(s) - alternaria brassicicola , pseudomonas syringae , arabidopsis , biology , phytoalexin , mutant , microbiology and biotechnology , reactive oxygen species , arabidopsis thaliana , botrytis cinerea , botany , pathogen , gene , biochemistry , resveratrol
Summary An Arabidopsis thaliana mutant, esa1 , that shows enhanced susceptibility to the necrotrophic pathogens Alternaria brassicicola , Botrytis cinerea and Plectosphaerella cucumerina , but has wild‐type levels of resistance to the biotrophic pathogens Pseudomonas syringae pv. tomato and Peronospora parasitica . The enhanced susceptibility towards necrotrophic pathogens correlated with a delayed induction of phytoalexin accumulation and delayed induction of the plant defensin gene PDF1.2 upon inoculation with pathogens. Two reactive oxygen generating compounds, paraquat and acifluorfen, were found to cause induction of both phytoalexin accumulation and PDF1.2 expression in wild‐type plants, but this induction was almost completely abolished in esa1 . This finding suggests that esa1 may somehow be involved in transduction of signals generated by reactive oxygen species.