Abstract
AIMS: The aim of the present investigation was to determine the influence of various Fusarium solani strains on the production of nematicidal agent(s) in vitro and biocontrol of Meloidogyne javanica in tomato by Pseudomonas fluorescens strains CHA0 and CHA0/pME3424. METHODS AND RESULTS: Culture filtrates (CF) of P. fluorescens strain CHA0 and its diacetylphloroglucinol-overproducing derivative CHA0/pME3424 caused substantial mortality of M. javanica juveniles in vitro. Bacterial growth medium amended with the growth medium of F. solani repressed the nematicidal activity of the bacteria. Methanol extract of F. solani CF resulting from Czapek's Dox liquid (CDL) medium without zinc amendment repressed the nematicidal activity of the bacteria while the CF obtained from CDL medium amended with zinc did not. Conidial suspension of F. solani strain Fs5 (repressor strain for the biosynthesis of nematicidal compounds in P. fluorescens) reduced biocontrol potential of the bacterial inoculants against M. javanica in tomato while strain Fs3 (non-repressor) did not. CONCLUSIONS: Fusarium solani strains with increased nematicidal activity repress the biosynthesis of nematicidal compounds by P. fluorescens strains in vitro and greatly alter its biocontrol efficacy against root-knot nematode under natural conditions. SIGNIFICANCE AND IMPACT OF THE STUDY: Fusarium solani strains are distributed worldwide and found in almost all the agricultural fields which suggest that some mycotoxin-producing strains will also be found in almost any soil sample taken. Besides the suppressive effect of these metabolite-producing strains on the production of nematicidal compound(s) critical in biocontrol, F. solani strains may also affect the performance of mycotoxin-sensitive biocontrol bacteria effective against plant-parasitic nematodes.
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Claims 6
Claim · model-written summary
Culture filtrates from Pseudomonas fluorescens CHA0 and its derivative caused substantial mortality of Meloidogyne javanica juveniles in vitro.
- Taxon
- tomato
Solanum lycopersicumt0 - Interactor
- M. javanicaMeloidogyne javanicae0pest
- Second interactor
- P. fluorescens
.JPG?width=60)
Pseudomonas fluorescense0biocontrol_agent - Outcome
- mortality of M. javanica juvenilese0
- Direction
- substantiale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.JPG?width=500)
Verbatim
e0“Culture filtrates (CF) of P. fluorescens strain CHA0 and its diacetylphloroglucinol-overproducing derivative CHA0/pME3424 caused substantial mortality of M. javanica juveniles in vitro”
t0“tomato”
Claim · model-written summary
Fusarium solani growth medium repressed the nematicidal activity of the bacteria.
- Taxon
- tomatoSolanum lycopersicumt0
- Interactor
- F. solani
_Sacc._5393379.jpg?width=60)
Fusarium solanie0other - Outcome
- nematicidal activity of the bacteriae0
- Direction
- repressede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Sacc._5393379.jpg?width=500)
Verbatim
e0“Bacterial growth medium amended with the growth medium of F. solani repressed the nematicidal activity of the bacteria”
t0“tomato”
Claim · model-written summary
Methanol extract of Fusarium solani filtrate from medium without zinc repressed bacterial nematicidal activity.
- Taxon
- tomatoSolanum lycopersicumt0
- Interactor
- F. solaniFusarium solanie0other
- Outcome
- nematicidal activity of the bacteriae0
- Direction
- repressede0
- Qualifier
- without zinc amendmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Methanol extract of F. solani CF resulting from Czapek's Dox liquid (CDL) medium without zinc amendment repressed the nematicidal activity of the bacteria”
t0“tomato”
Claim · model-written summary
Fusarium solani filtrate from zinc-amended medium did not repress bacterial nematicidal activity.
- Taxon
- tomatoSolanum lycopersicumt0
- Interactor
- Fusarium solaniFusarium solanit0other
- Outcome
- nematicidal activity of the bacteriae1
- Direction
- did note0
- Qualifier
- amended with zince0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the CF obtained from CDL medium amended with zinc did not”
e1“without zinc amendment repressed the nematicidal activity of the bacteria”
t0“Non-pathogenic Fusarium solani represses the biosynthesis of nematicidal compounds in vitro and reduces the biocontrol of Meloidogyne javanica by Pseudomonas fluorescens in tomato”
Claim · model-written summary
Fusarium solani strain Fs5 reduced bacterial biocontrol against Meloidogyne javanica in tomato.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- Conidial suspension of F. solani strain Fs5e0
- Interactor
- M. javanicaMeloidogyne javanicae0pest
- Second interactor
- P. fluorescensPseudomonas fluorescense0biocontrol_agent
- Outcome
- biocontrol potential of the bacterial inoculants against M. javanicae0
- Direction
- reducede0
- Comparator
- strain Fs3e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Conidial suspension of F. solani strain Fs5 (repressor strain for the biosynthesis of nematicidal compounds in P. fluorescens) reduced biocontrol potential of the bacterial inoculants against M. javanica in tomato while strain Fs3 (non-repressor) did not”
Claim · model-written summary
Fusarium solani strain Fs3 did not reduce bacterial biocontrol of Meloidogyne javanica in tomato.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- strain Fs3e0
- Interactor
- M. javanicaMeloidogyne javanicae0pest
- Second interactor
- P. fluorescensPseudomonas fluorescense0biocontrol_agent
- Outcome
- biocontrol potential of the bacterial inoculants against M. javanicae0
- Direction
- did note0
- Comparator
- strain Fs5e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Conidial suspension of F. solani strain Fs5 (repressor strain for the biosynthesis of nematicidal compounds in P. fluorescens) reduced biocontrol potential of the bacterial inoculants against M. javanica in tomato while strain Fs3 (non-repressor) did not”
The same questions in other papers
Fusarium solani · Meloidogyne javanica · Solanum lycopersicum (tomato)Positive and negative results
4 in the opposite direction
- positive
- positive
- positive
1 paper more in this group
See all 5 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.