Abstract
This study was conducted to evaluate the nematicidal potential of Paenibacillus elgii strain HOA73 against the root-knot nematode, Meloidogyne incognita , under both in vitro and in vivo conditions. The novel strain HOA73 (GenBank accession number JQ12069) produced hydrolytic enzymes including gelatinase and chitinase. Exposure of M. incognita to various concentrations (10-30%) of the bacterial culture filtrate (BCF) or 0.05-0.4 mg ml −1 of the crude enzymes produced by P. elgii HOA73 significantly reduced hatch of the second-stage juvenile (J2) and caused substantial mortality under in vitro conditions. The hatch inhibition and J2 mortality rate was enhanced with the increase in the concentration of BCF and the crude enzymes. Similarly, the antagonistic effects also increased significantly over the time for which the treatments were given. Moreover, the crude enzymes partially destroyed cuticle layers of eggs and juveniles at 0.4 mg ml −1 concentration. Furthermore, the pot experiment indicated that addition of HOA73 culture into potted soil significantly reduced the root galling, number of egg masses and nematode population by 62.1%, 69.8% and 53.0%, respectively, as compared to the control at 7 weeks after M. incognita infestation. HOA73 inoculation also promoted tomato plant fresh shoot weight by 17.9% as compared to control. Hence, the present results demonstrated the ability of P. elgii HOA73 as a potential biocontrol candidate against the root-knot nematode as well as a plant growth promoter for tomato.
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Claims 12
Claim · model-written summary
Strain HOA73 produced gelatinase and chitinase.
- Taxon
- tomato
Solanum lycopersicumt0 - Interactor
- HOA73e0biocontrol_agent
- Outcome
- hydrolytic enzymes including gelatinase and chitinasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The novel strain HOA73 (GenBank accession number JQ12069) produced hydrolytic enzymes including gelatinase and chitinase”
t0“tomato plant fresh shoot weight”
Claim · model-written summary
Bacterial culture filtrate reduced nematode J2 hatch in vitro.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- bacterial culture filtrate (BCF)e0
- Interactor
- M. incognita
_penetrates_a_tomato_root_-_USDA-ARS.jpg?width=60)
Meloidogyne incognitae0pest - Second interactor
- P. elgii HOA73Paenibacillus elgiie0biocontrol_agent
- Outcome
- hatch of the second-stage juvenile (J2)e0
- Direction
- reducede0
- Setting
- in vitro conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_penetrates_a_tomato_root_-_USDA-ARS.jpg?width=500)
Verbatim
e0“Exposure of M. incognita to various concentrations (10-30%) of the bacterial culture filtrate (BCF) or 0.05-0.4 mg ml −1 of the crude enzymes produced by P. elgii HOA73 significantly reduced hatch of the second-stage juvenile (J2) and caused substantial mortality under in vitro conditions”
t0“tomato plant fresh shoot weight”
Claim · model-written summary
Crude enzymes reduced nematode J2 hatch in vitro.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- 0.05-0.4 mg ml −1 of the crude enzymese0
- Interactor
- M. incognitaMeloidogyne incognitae0pest
- Second interactor
- P. elgii HOA73Paenibacillus elgiie0biocontrol_agent
- Outcome
- hatch of the second-stage juvenile (J2)e0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exposure of M. incognita to various concentrations (10-30%) of the bacterial culture filtrate (BCF) or 0.05-0.4 mg ml −1 of the crude enzymes produced by P. elgii HOA73 significantly reduced hatch of the second-stage juvenile (J2) and caused substantial mortality under in vitro conditions”
t0“tomato plant fresh shoot weight”
Claim · model-written summary
Bacterial culture filtrate caused J2 mortality in vitro.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- bacterial culture filtrate (BCF)e0
- Interactor
- M. incognitaMeloidogyne incognitae0pest
- Second interactor
- P. elgii HOA73Paenibacillus elgiie0biocontrol_agent
- Outcome
- mortalitye0
- Direction
- substantiale0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exposure of M. incognita to various concentrations (10-30%) of the bacterial culture filtrate (BCF) or 0.05-0.4 mg ml −1 of the crude enzymes produced by P. elgii HOA73 significantly reduced hatch of the second-stage juvenile (J2) and caused substantial mortality under in vitro conditions”
t0“tomato plant fresh shoot weight”
Claim · model-written summary
Crude enzymes caused J2 mortality in vitro.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- crude enzymese0
- Interactor
- M. incognitaMeloidogyne incognitae0pest
- Second interactor
- P. elgii HOA73Paenibacillus elgiie0biocontrol_agent
- Outcome
- mortalitye0
- Direction
- substantiale0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exposure of M. incognita to various concentrations (10-30%) of the bacterial culture filtrate (BCF) or 0.05-0.4 mg ml −1 of the crude enzymes produced by P. elgii HOA73 significantly reduced hatch of the second-stage juvenile (J2) and caused substantial mortality under in vitro conditions”
t0“tomato plant fresh shoot weight”
Claim · model-written summary
Higher BCF and enzyme concentrations increased hatch inhibition and J2 mortality.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- concentration of BCF and the crude enzymese0
- Outcome
- hatch inhibition and J2 mortality ratee0
- Direction
- enhancede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The hatch inhibition and J2 mortality rate was enhanced with the increase in the concentration of BCF and the crude enzymes”
t0“tomato plant fresh shoot weight”
Claim · model-written summary
Longer treatment time increased antagonistic effects.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- treatmentse0
- Outcome
- antagonistic effectse0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the antagonistic effects also increased significantly over the time for which the treatments were given”
t0“tomato plant fresh shoot weight”
Claim · model-written summary
At 0.4 mg ml −1, crude enzymes partially destroyed nematode egg and juvenile cuticles.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- crude enzymese0
- Outcome
- cuticle layers of eggs and juvenilese0
- Direction
- destroyede0
- Value
- 0.4 mg ml −1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the crude enzymes partially destroyed cuticle layers of eggs and juveniles at 0.4 mg ml −1 concentration”
t0“tomato plant fresh shoot weight”
Claim · model-written summary
HOA73 soil culture reduced tomato root galling by 62.1%.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- addition of HOA73 culture into potted soile0
- Interactor
- M. incognitaMeloidogyne incognitae0pest
- Second interactor
- HOA73e0biocontrol_agent
- Outcome
- root gallinge0
- Direction
- reducede0
- Value
- 62.1%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“addition of HOA73 culture into potted soil significantly reduced the root galling, number of egg masses and nematode population by 62.1%, 69.8% and 53.0%, respectively, as compared to the control at 7 weeks after M. incognita infestation”
t0“tomato plant fresh shoot weight”
Claim · model-written summary
HOA73 soil culture reduced nematode egg masses by 69.8%.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- addition of HOA73 culture into potted soile0
- Interactor
- M. incognitaMeloidogyne incognitae0pest
- Second interactor
- HOA73e0biocontrol_agent
- Outcome
- number of egg massese0
- Direction
- reducede0
- Value
- 69.8%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“addition of HOA73 culture into potted soil significantly reduced the root galling, number of egg masses and nematode population by 62.1%, 69.8% and 53.0%, respectively, as compared to the control at 7 weeks after M. incognita infestation”
t0“tomato plant fresh shoot weight”
Claim · model-written summary
HOA73 soil culture reduced nematode population by 53.0%.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- addition of HOA73 culture into potted soile0
- Interactor
- M. incognitaMeloidogyne incognitae0pest
- Second interactor
- HOA73e0biocontrol_agent
- Outcome
- nematode populatione0
- Direction
- reducede0
- Value
- 53.0%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“addition of HOA73 culture into potted soil significantly reduced the root galling, number of egg masses and nematode population by 62.1%, 69.8% and 53.0%, respectively, as compared to the control at 7 weeks after M. incognita infestation”
t0“tomato plant fresh shoot weight”
Claim · model-written summary
HOA73 inoculation increased tomato fresh shoot weight by 17.9%.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- HOA73 inoculatione0
- Interactor
- HOA73e0biocontrol_agent
- Outcome
- plant fresh shoot weighte0
- Direction
- promotede0
- Value
- 17.9%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“HOA73 inoculation also promoted tomato plant fresh shoot weight by 17.9% as compared to control”
The same questions in other papers
inoculation · growth · Solanum lycopersicum (tomato)Positive and negative results
386 papers in the same direction as this paper · 53 in the opposite direction · 1 reporting no difference from an alternative
- positive
- no effect
- no effect
437 papers more in this group
See all 441 papers →pathogen product · Meloidogyne incognita · Solanum lycopersicum (tomato)Results agree
22 papers in the same direction as this paper
- positive
- positive
- positive
19 papers more in this group
See all 23 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.