Abstract
Fusarium oxysporum is an abundant plant pathogen in the soil and is found in the rhizosphere of many plant species. The fungus has numerous formae speciales (f.sp.) that infect and cause wilt diseases of a variety of host plants. F. oxysporum f.sp lycopersici (Fol) and F. oxysporum f.sp lini (Foln) are known to infect tomato and flax, respectively. Fluorescent pseudomonads can suppress various soilborne diseases, and their efficacy has been related both to their antagonistic activities and to their rhizosphere competitiveness. In this study, the biocontrol capacity of plant growth-promoting rhizobacteria (PGPR) strains of Pseudomonas fluorescens against fusarium wilt of tomato and flax was evaluated both in vitro and in planta. The P. fluorescens strains exhibited substantial antagonistic activities against the two fungal isolates on three culture media tested: King B (KB), potato dextrose agar (PDA) and a mixture of both (KB + PDA). As compared to the untreated control, the mycelial growth decreased by 8.33 to 49.33%. Conidial germination and germ tube elongation were significantly inhibited and reduced, respectively, by 6.15 to 47.33% and by 1.63 to 45.45%. In bioassay trials, P. fluorescens strains significantly reduced the disease incidence and severity by 4.86 to 74.49% on tomato plants and 3.93 to 79.19% on flax plants. The different efficacy of the biocontrol agents could be due to the influence of several factors, including the efficiency of the strain, the type of pathogen and the host. Key words: Plant growth-promoting rhizobacteria (PGPR), Pseudomonas fluorescens, fusarium wilt, tomato, flax, biocontrol.
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Claims 6
Claim · model-written summary
P. fluorescens strains antagonized both fungal isolates on three media.
- Taxon
- tomato
Solanum lycopersicumt0 - Interactor
- fungal isolatese0pathogen
- Second interactor
- P. fluorescens
.JPG?width=60)
Pseudomonas fluorescense0biocontrol_agent - Outcome
- antagonistic activitiese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.JPG?width=500)
Verbatim
e0“The P. fluorescens strains exhibited substantial antagonistic activities against the two fungal isolates on three culture media tested: King B (KB), potato dextrose agar (PDA) and a mixture of both (KB + PDA).”
t0“tomato and flax”
Claim · model-written summary
Mycelial growth fell 8.33 to 49.33% relative to untreated controls.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- Pseudomonas fluorescenst0
- Second interactor
- Pseudomonas fluorescensPseudomonas fluorescenst0biocontrol_agent
- Outcome
- mycelial growthe0
- Direction
- decreasede0
- Value
- 8.33 to 49.33%e0
- Comparator
- untreated controle0
FusariumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“As compared to the untreated control, the mycelial growth decreased by 8.33 to 49.33%.”
t0“Evaluation of Pseudomonas fluorescens for the biocontrol of fusarium wilt in tomato and flax”
Claim · model-written summary
Conidial germination was inhibited by 6.15 to 47.33%.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- Pseudomonas fluorescenst0
- Second interactor
- Pseudomonas fluorescensPseudomonas fluorescenst0biocontrol_agent
- Outcome
- Conidial germinatione0
- Direction
- inhibitede0
- Value
- 6.15 to 47.33%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Conidial germination and germ tube elongation were significantly inhibited and reduced, respectively, by 6.15 to 47.33% and by 1.63 to 45.45%.”
t0“Evaluation of Pseudomonas fluorescens for the biocontrol of fusarium wilt in tomato and flax”
Claim · model-written summary
Germ tube elongation was reduced by 1.63 to 45.45%.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- Pseudomonas fluorescenst0
- Second interactor
- Pseudomonas fluorescensPseudomonas fluorescenst0biocontrol_agent
- Outcome
- germ tube elongatione0
- Direction
- reducede0
- Value
- 1.63 to 45.45%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Conidial germination and germ tube elongation were significantly inhibited and reduced, respectively, by 6.15 to 47.33% and by 1.63 to 45.45%.”
t0“Evaluation of Pseudomonas fluorescens for the biocontrol of fusarium wilt in tomato and flax”
Claim · model-written summary
P. fluorescens reduced tomato disease incidence and severity by 4.86 to 74.49%.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- P. fluorescens strainse0
- Second interactor
- P. fluorescensPseudomonas fluorescense0biocontrol_agent
- Outcome
- disease incidence and severitye0
- Direction
- reducede0
- Value
- 4.86 to 74.49%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“P. fluorescens strains significantly reduced the disease incidence and severity by 4.86 to 74.49% on tomato plants and 3.93 to 79.19% on flax plants.”
t0“fusarium wilt in tomato and flax”
Claim · model-written summary
P. fluorescens reduced flax disease incidence and severity by 3.93 to 79.19%.
- Taxon
- flax
Linum usitatissimume0 - Treatment
- P. fluorescens strainse0
- Second interactor
- P. fluorescensPseudomonas fluorescense0biocontrol_agent
- Outcome
- disease incidence and severitye0
- Direction
- reducede0
- Value
- 3.93 to 79.19%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“P. fluorescens strains significantly reduced the disease incidence and severity by 4.86 to 74.49% on tomato plants and 3.93 to 79.19% on flax plants.”
t0“fusarium wilt in tomato and flax”
The same questions in other papers
Pseudomonas fluorescens · Fusarium · Solanum lycopersicum (tomato)Results agree
3 papers in the same direction as this paper
- positive
- positive
- positive
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.