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THE PLANT CELL, Vol 9, Issue 3 305-316, Copyright © 1997 by American Society of Plant Biologists
Arabidopsis Enhanced Disease Susceptibility Mutants Exhibit Enhanced Susceptibility to Several Bacterial Pathogens and Alterations in PR-1 Gene Expression
E. E. Rogers and F. M. Ausubel
Department of Genetics, Harvard Medical School, and Department of Molecular Biology, Massachusetts General Hospital, Boston, Massachusetts 02114
To identify plant defense responses that limit pathogen attack, Arabidopsis
eds mutants that exhibit enhanced disease susceptibility to the virulent
bacterial pathogen Pseudomonas syringae pv maculicola ES4326 were
previously identified. In this study, we show that each of four eds mutants
(eds5-1, eds6-1, eds7-1, and eds9-1) has a distinguishable phenotype with
respect to the degree of susceptibility to a panel of bacterial
phytopathogens and the ability to activate pathogenesis-related PR-1 gene
expression after pathogen attack. None of the four eds mutants exhibited
observable defects in mounting a hypersensitive response. Although all four
eds mutants were also capable of mounting a systemic acquired resistance
response, enhanced growth of P. s. maculicola ES4326 was still apparent in
the secondarily infected leaves of three of the eds mutants. These data
indicate that eds genes define a diverse set of previously unknown defense
responses that affect resistance to virulent pathogens.
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[Abstract]
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