Molecular Plant-Microbe Interactions (2002) 15, 323-333

Vincenzo Fogliano, Alessandro Ballio, Monica Gallo, Sheridan Woo, Felice Scala and Matteo Lorito (2002)
Pseudomonas lipodepsipeptides and fungal cell wall-degrading enzymes act synergistically in biological control
Molecular Plant-Microbe Interactions 15 (4), 323-333
Abstract: Pseudomonas syringae pv. syringae strain B359 secreted two main lipodepsipeptides (LDPs), syringomycin E (SRE) and syringopeptin 25A (SP(25A)), together with at least four types of cell wall-degrading enzymes (CWDEs). In antifungal bioassays, the purified toxins SRE and SP(25A) interacted synergistically with chitinolytic and glucanolytic enzymes purified from the same bacterial strain or from the biocontrol fungus Trichoderma atroviride strain P1. The synergism between LDPs and CWDEs occurred against all seven different fungal species tested and P. syringae itself, with a level dependent on the enzyme used to permeabilize the microbial cell wall. The antifungal activity of SP(25A) was much more increased by the CWDE action than was that of the smaller SRE, suggesting a stronger antifungal role for SP(25A). In vivo biocontrol assays were performed by using P. syringae alone or in combination with T. atroviride, including a Trichoderma endochitinase knock-out mutant in place of the wild type and a chitinase-specific enzyme inhibitor. These experiments clearly indicate that the synergistic interaction LDPs-CWDEs is involved in the antagonistic mechanism of P. syringae, and they support the concept that a more effective disease control is given by the combined action of the two agents.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Sheridan L. Woo, Felice Scala

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
molecular biology - genes

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
Pseudomonas syringae (antagonist)
Trichoderma atroviride (antagonist)