Abstract
Pathogen-suppressive soils are influenced by soil microbiota and can be lost by external inputs. We evaluated the stability of soil suppressiveness to Meloidogyne incognita and identified the culturable bacterial strains responsible for the exerted biocontrol. In soil previously characterised as suppressive to M. incognita, the culturable bacterial species involved in suppressiveness were characterised for their nematode biocontrol properties and taxonomically. Forty-two bacterial strains were isolated from suppressive soil, with 18 identified as having nematode biocontrol potential. Thus, isolated bacteria were responsible for the suppressiveness of the soil. The 16S rRNA gene was sequenced in the isolates, and six genera were identified: Bacillus, Pseudomonas, Leclercia, Paenarthrobacter, Pantoea, and Exiguobacterium. The M. incognita-suppressive soil was amended with 100 ppm of the fungicide cyproconazole, the antibiotic streptomycin, a Bacillus velezensis strain BMH, and commercial bionematicide and compared with the non-treated or autoclaved control. Each soil slurry was infested with 6000 M. incognita eggs, and the number of galls and eggs were evaluated 45 days after sowing. Streptomycin, cyproconazole, and B. velezensis amendments to suppressive soil disrupted microbial functions and increased the number of galls by 168, 86, and 32%, respectively, and the number of eggs by 273, 36, and 48%, respectively, compared to the non-treated soil. Commercial bionematicides did not affect soil suppressiveness. Therefore, external fungicide and bactericide disrupt the natural suppressiveness of the soil, with the latter being more damaging.
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Claims 7
Claim · model-written summary
Streptomycin increased tomato galls by 168% versus untreated soil.
- Taxon
- tomato plants
Solanum lycopersicumt0 - Treatment
- Streptomycine0
- Interactor
- B. velezensis
Bacillus velezensise0biocontrol_agent - Outcome
- number of gallse0
- Direction
- increasede0
- Value
- 168e0
- Comparator
- non-treated soile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Streptomycin, cyproconazole, and B. velezensis amendments to suppressive soil disrupted microbial functions and increased the number of galls by 168, 86, and 32%, respectively, and the number of eggs by 273, 36, and 48%, respectively, compared to the non-treated soil.”
t0“tomato plants”
Claim · model-written summary
Cyproconazole increased galls by 86%.
- Taxon
- tomato plantsSolanum lycopersicumt0
- Treatment
- cyproconazolee0
- Outcome
- number of gallse0
- Direction
- increasede0
- Value
- 86e0
- Comparator
- non-treated soile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Streptomycin, cyproconazole, and B. velezensis amendments to suppressive soil disrupted microbial functions and increased the number of galls by 168, 86, and 32%, respectively, and the number of eggs by 273, 36, and 48%, respectively, compared to the non-treated soil.”
t0“tomato plants”
Claim · model-written summary
B. velezensis increased galls by 32%.
- Taxon
- tomato plantsSolanum lycopersicumt0
- Treatment
- B. velezensise0
- Interactor
- B. velezensisBacillus velezensise0biocontrol_agent
- Outcome
- number of gallse0
- Direction
- increasede0
- Value
- 32%e0
- Comparator
- non-treated soile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Streptomycin, cyproconazole, and B. velezensis amendments to suppressive soil disrupted microbial functions and increased the number of galls by 168, 86, and 32%, respectively, and the number of eggs by 273, 36, and 48%, respectively, compared to the non-treated soil.”
t0“tomato plants”
Claim · model-written summary
Streptomycin increased nematode eggs by 273%.
- Taxon
- tomato plantsSolanum lycopersicumt0
- Treatment
- Streptomycine0
- Outcome
- number of eggse0
- Direction
- increasede0
- Value
- 273e0
- Comparator
- non-treated soile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Streptomycin, cyproconazole, and B. velezensis amendments to suppressive soil disrupted microbial functions and increased the number of galls by 168, 86, and 32%, respectively, and the number of eggs by 273, 36, and 48%, respectively, compared to the non-treated soil.”
t0“tomato plants”
Claim · model-written summary
Cyproconazole increased nematode eggs by 36%.
- Taxon
- tomato plantsSolanum lycopersicumt0
- Treatment
- cyproconazolee0
- Outcome
- number of eggse0
- Direction
- increasede0
- Value
- 36e0
- Comparator
- non-treated soile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Streptomycin, cyproconazole, and B. velezensis amendments to suppressive soil disrupted microbial functions and increased the number of galls by 168, 86, and 32%, respectively, and the number of eggs by 273, 36, and 48%, respectively, compared to the non-treated soil.”
t0“tomato plants”
Claim · model-written summary
B. velezensis increased nematode eggs by 48%.
- Taxon
- tomato plantsSolanum lycopersicumt0
- Treatment
- B. velezensise0
- Interactor
- B. velezensisBacillus velezensise0biocontrol_agent
- Outcome
- number of eggse0
- Direction
- increasede0
- Value
- 48%e0
- Comparator
- non-treated soile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Streptomycin, cyproconazole, and B. velezensis amendments to suppressive soil disrupted microbial functions and increased the number of galls by 168, 86, and 32%, respectively, and the number of eggs by 273, 36, and 48%, respectively, compared to the non-treated soil.”
t0“tomato plants”
Claim · model-written summary
Commercial bionematicides did not affect soil suppressiveness.
- Taxon
- tomato plantsSolanum lycopersicumt0
- Treatment
- Commercial bionematicidese0
- Outcome
- soil suppressivenesse0
- Direction
- did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Commercial bionematicides did not affect soil suppressiveness.”
t0“tomato plants”
The same questions in other papers
Bacillus velezensis · pest · Solanum lycopersicum (tomato)Results differ
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.