Abstract
Nonpathogenic Fusarium oxysporum endophytes from healthy banana roots were evaluated for their ability to reduce Fusarium wilt of banana (Panama disease). Isolates were identified morphologically and by using species-specific primers. Pathogenicity was confirmed by inoculating banana plantlets in the greenhouse. Nonpathogenic F. oxysporum isolates were grouped into 14 haplotype groups by polymerase chain reaction restriction fragment length polymorphism analysis of the intergenic spacer region, and representative isolates evaluated for biocontrol of F. oxysporum f. sp. cubense. In the greenhouse, 10 nonpathogenic F. oxysporum isolates were able to significantly reduce Fusarium wilt of banana. The isolate that protected banana plantlets best in the greenhouse, a nonpathogenic F. oxysporum from the root rhizosphere, and Pseudomonas fluorescens WCS 417 were then field tested. When the putative biological control organisms were tested in the field, neither the nonpathogenic F. oxysporum, P. fluorescens, nor combinations thereof reduced Fusarium wilt development significantly. A number of factors could contribute to the lack of field protection, including soil microbial and chemical composition and reduced survival of biocontrol organisms in banana roots. A lack of knowledge regarding the etiology of Fusarium wilt of 'Cavendish' banana in the subtropics and the effect of F. oxysporum f. sp. cubense race and banana cultivar in protection of banana by biocontrol organisms should be further investigated.
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Claims 6
Claim · model-written summary
In the greenhouse, 10 nonpathogenic F. oxysporum isolates significantly reduced Fusarium wilt of banana.
- Taxon
- bananae0
- Treatment
- nonpathogenic F. oxysporum isolatese0
- Interactor
- nonpathogenic F. oxysporume0biocontrol_agent
- Outcome
- Fusarium wilte0
- Direction
- reducee0
- Qualifier
- 10 nonpathogenic F. oxysporum isolatese0
- Setting
- greenhousee0
Not reportedComparator
Verbatim
e0“In the greenhouse, 10 nonpathogenic F. oxysporum isolates were able to significantly reduce Fusarium wilt of banana”
Claim · model-written summary
In the field, the nonpathogenic F. oxysporum isolate did not significantly reduce Fusarium wilt development in banana.
- Taxon
- bananae1
- Treatment
- nonpathogenic F. oxysporume0
- Interactor
- nonpathogenic F. oxysporume0biocontrol_agent
- Outcome
- Fusarium wilt developmente0
- Direction
- reducede0
- Setting
- fielde0
Not reportedComparator
Verbatim
e0“When the putative biological control organisms were tested in the field, neither the nonpathogenic F. oxysporum, P. fluorescens, nor combinations thereof reduced Fusarium wilt development significantly”
e1“healthy banana roots”
Claim · model-written summary
In the field, P. fluorescens did not significantly reduce Fusarium wilt development in banana.
- Taxon
- bananae1
- Treatment
- P. fluorescense0
- Interactor
- P. fluorescens
.JPG?width=60)
Pseudomonas fluorescense0biocontrol_agent - Outcome
- Fusarium wilt developmente0
- Direction
- reducede0
- Setting
- fielde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.JPG?width=500)
Verbatim
e0“When the putative biological control organisms were tested in the field, neither the nonpathogenic F. oxysporum, P. fluorescens, nor combinations thereof reduced Fusarium wilt development significantly”
e1“healthy banana roots”
Claim · model-written summary
In the field, combinations of nonpathogenic F. oxysporum and P. fluorescens did not significantly reduce Fusarium wilt development in banana.
- Taxon
- bananae1
- Treatment
- combinations thereofe0
- Interactor
- nonpathogenic F. oxysporume0biocontrol_agent
- Second interactor
- P. fluorescensPseudomonas fluorescense0biocontrol_agent
- Outcome
- Fusarium wilt developmente0
- Direction
- reducede0
- Setting
- fielde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When the putative biological control organisms were tested in the field, neither the nonpathogenic F. oxysporum, P. fluorescens, nor combinations thereof reduced Fusarium wilt development significantly”
e1“healthy banana roots”
Claim · model-written summary
The authors suggest soil microbial and chemical composition and reduced survival of biocontrol organisms in banana roots could contribute to the lack of field protection.
Verbatim
e0“A number of factors could contribute to the lack of field protection, including soil microbial and chemical composition and reduced survival of biocontrol organisms in banana roots”
Claim · model-written summary
Nonpathogenic F. oxysporum isolates from healthy banana roots were grouped into 14 haplotype groups by PCR-RFLP of the intergenic spacer region.
Not reportedDirection
Verbatim
e0“Nonpathogenic F. oxysporum isolates were grouped into 14 haplotype groups by polymerase chain reaction restriction fragment length polymorphism analysis of the intergenic spacer region”
e1“healthy banana roots”
The same questions in other papers
Fusarium oxysporum · disease · MusaPositive and negative results
1 in the opposite direction · 1 reporting no difference from an alternative
- negative
- no effect
Pseudomonas fluorescens · disease · MusaPositive 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.