Suppression of root-knot disease by Pseudomonas fluorescens CHA0 in tomato: importance of bacterial secondary metabolite, 2,4-diacetylpholoroglucinol

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Role of cyanide production by Pseudomonas fluorescens CHA0 in the suppression of root-knot nematode, Meloidogyne javanica in tomato (2006, background): “In our previous studies, the resistant reaction in tomato roots against root-knot nematodes caused by strain CHA0 was found to be mediated by a secondary metabolite, 2,4-diacetylphloroglucinol ( Siddiqui & Shaukat 2003b ), but was independent of salicylic acid production (Siddiqui & Shaukat 2004).”
Induced Systemic Resistance as a Mechanism of Disease Suppression by Rhizobacteria (2005, background): “DAPG has likewise been shown to act as the inducing agent in CHA0-mediated ISR in tomato against the root-knot nematode Meloidogyne javanica (Siddiqui and Shaukat, 2003).”
Rhizobacteria-induced systemic resistance (2009, background): “Also in this case, ISR seems to depend on the production of DAPG, as a DAPG-negative mutant was not effective in reducing the disease in split-root assays, and effectiveness could be restored by complementation of the mutant (Siddiqui and Shaukat, 2003).”
Mechanisms Used by Plant Growth-Promoting Bacteria (2011, background): “Besides ethylene and jasmonate, other bacterial molecules such as the O-antigenic side chain of the bacterial outer membrane protein lipopolysaccharide (Leeman et al. 1995), flagellar fractions (Zipfel et al. 2004), pyoverdine (Maurhofer et al. 1994), DAPG (Iavicoli et al. 2003; Siddiqui and Shoukat”