Induction of Systemic Resistance of Tobacco to Tobacco Necrosis Virus by the Root-Colonizing<i>Pseudomonas fluorescens</i>Strain CHA0: Influence of the<i>gacA</i>Gene and of Pyoverdine Production

Maurhofer, M.; Häse, Claudia C.; Meuwly, Philippe; Jp, Metraux; Défago, Geneviève

doi:10.1094/phyto-84-139

Cited by 498 publications

(254 citation statements)

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“…ISR can also take place following exposure of the plant to compounds produced by plant-beneficial bacteria, e.g. the volatile 2,3-butanediol (Ryu et al 2004), the siderophore pyoverdine (Maurhofer et al 1994), DAPG (Iavicoli et al 2003), and cyclic lipopeptide surfactants (Ongena et al 2007;Tran et al 2007). …”

Section: Direct Positive Effects Of Rhizosphere Microorganisms On Thementioning

confidence: 99%

The rhizosphere: a playground and battlefield for soilborne pathogens and beneficial microorganisms

et al. 2008

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The rhizosphere is a hot spot of microbial interactions as exudates released by plant roots are a main food source for microorganisms and a driving force of their population density and activities. The rhizosphere harbors many organisms that have a neutral effect on the plant, but also attracts organisms that exert deleterious or beneficial effects on the plant. Microorganisms that adversely affect plant growth and health are the pathogenic fungi, oomycetes, bacteria and nematodes. Most of the soilborne pathogens are adapted to grow and survive in the bulk soil, but the rhizosphere is the playground and infection court where the pathogen establishes a parasitic relationship with the plant. The rhizosphere is also a battlefield where the complex rhizosphere community, both microflora and microfauna, interact with pathogens and influence the outcome of pathogen infection. A wide range of microorganisms are beneficial to the plant and include nitrogen-fixing bacteria, endo-and ectomycorrhizal fungi, and plant growth-promoting bacteria and fungi. This review focuses on the population dynamics and activity of soilborne pathogens and beneficial microorganisms. Specific attention is given to mechanisms involved in the tripartite interactions between beneficial microorganisms, pathogens and the plant. We also discuss how agricultural practices affect pathogen and antagonist populations and how these practices can be adopted to promote plant growth and health.

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Section: Direct Positive Effects Of Rhizosphere Microorganisms On Thementioning

confidence: 99%

The rhizosphere: a playground and battlefield for soilborne pathogens and beneficial microorganisms

et al. 2008

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“…Information about a role for siderophores in ISR is limited and controversial. A mutant of P. fluorescens CHA0, unable to produce the siderophore pyoverdin, lost the ability to induce ISR to tobacco necrosis virus in tobacco (24). In the low iron radish-Fusarium wilt system, pyoverdin-deficient mutants of P. fluorescens WCS374 and WCS417r induced the same resistance levels as the wild-type strains.…”

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confidence: 98%

“…This phenomenon, termed induced systemic resistance (ISR), has been demonstrated for various rhizobacteria in several plants (2,19,24,36,40). The induced resistance reduces disease symptoms of a wide range of pathogens (10,(20)(21)(22)40), and its physiological characterization is in progress.…”

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confidence: 99%

“…The induced resistance reduces disease symptoms of a wide range of pathogens (10,(20)(21)(22)40), and its physiological characterization is in progress. In some cases, ISR by rhizobacteria is characterized by a systemic accumulation of pathogenesis-related proteins (24) that is also associated with pathogen-induced systemic acquired resistance (SAR) (39). In other cases, however, rhizobacterial ISR is not associated with an accumulation of pathogenesis-related proteins (11,27).…”

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Salicylic Acid Produced by the Rhizobacterium Pseudomonas aeruginosa 7NSK2 Induces Resistance to Leaf Infection by Botrytis cinerea on Bean

Meyer¹,

Höfte²

1997

Phytopathology®

285

145

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De Meyer, G., and Höfte, M. 1997. Salicylic acid produced by the rhizobacterium Pseudomonas aeruginosa 7NSK2 induces resistance to leaf infection by Botrytis cinerea on bean. Phytopathology 87:588-593.Selected strains of nonpathogenic rhizobacteria can induce a systemic resistance in plants that is effective against various pathogens. In an assay with bean plants, we investigated which determinants of the rhizobacterium Pseudomonas aeruginosa 7NSK2 are important for induction of resistance to Botrytis cinerea. By varying the iron nutritional state of the bacterium at inoculation, it was demonstrated that induced resistance by P. aeruginosa 7NSK2 was iron-regulated. As P. aeruginosa 7NSK2 produces three siderophores under iron limitation, pyoverdin, pyochelin, and salicylic acid, we investigated the involvement of these iron-regulated metabolites in induced resistance by using mutants deficient in one or more siderophores. Results demonstrated that salicylic acid production was essential for induction of resistance to B. cinerea by P. aeruginosa 7NSK2 in bean and did not exclude a role for pyochelin. A role for pyoverdin, however, could not be demonstrated. Transcriptional activity of salicylic acid and pyochelin biosynthetic genes was detected during P. aeruginosa 7NSK2 colonization of bean. Moreover, the iron nutritional state at inoculation influenced the transcriptional activity of salicylic acid and pyochelin biosynthetic genes in the same way as it influenced induction of systemic resistance to B. cinerea.

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“…An enhanced resistance elicited by P. fluorescens CHA0 in tobacco might be fully explained by the bacterial production of SA, which could elicit a SAR response. Treatment of tobacco roots with CHA0 triggers accumulation of SA-inducible PR-proteins in the leaves (Maurhofer et al, 1994). Moreover, transformation of the SA-biosynthetic gene cluster of CHA0 into P. fluorescens P3 improved the systemic resistance-inducing capacity of this strain (Maurhofer et al, 1998).…”

Section: U N C O R R E C T E D P R O O F Smentioning

confidence: 99%

Signalling Cascades Involved in Induced Resistance

Pieterse

Loon

2007

Induced Resistance for Plant Defence

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Induction of Systemic Resistance of Tobacco to Tobacco Necrosis Virus by the Root-ColonizingPseudomonas fluorescensStrain CHA0: Influence of thegacAGene and of Pyoverdine Production

Cited by 498 publications

References 0 publications

The rhizosphere: a playground and battlefield for soilborne pathogens and beneficial microorganisms

The rhizosphere: a playground and battlefield for soilborne pathogens and beneficial microorganisms

Salicylic Acid Produced by the Rhizobacterium Pseudomonas aeruginosa 7NSK2 Induces Resistance to Leaf Infection by Botrytis cinerea on Bean

Signalling Cascades Involved in Induced Resistance

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