Abstract
Meloidogyne incognita is obligate parasitic nematode with a wide variety of hosts that causes huge economic losses every year. In an effort to identify novel bacterial biocontrols against M. incognita , the nematicidal activity of Bacillus velezensis strain Bv-25 obtained from cucumber rhizosphere soil was measured. Strain Bv-25 could inhibit the egg hatching of M. incognita and had strong nematicidal activity, with the mortality rate of second-stage M. incognita juveniles (J2s) at 100% within 12 h of exposure to Bv-25 fermentation broth. The M. incognita genes ord-1 , mpk-1 , and flp-18 were suppressed by Bv-25 fumigation treatment after 48 h. Strain Bv-25 could colonize cucumber roots, with 5.94 × 10 7 colony-forming units/g attached within 24 h, effectively reducing the infection rate with J2s by 98.6%. The bacteria up-regulated the expression levels of cucumber defense response genes pr1 , pr3 , and lox1 and induced resistance to M. incognita in split-root trials. Potted trials showed that Bv-25 reduced cucumber root knots by 73.8%. The field experiment demonstrated that disease index was reduced by 61.6%, cucumber height increased by 14.4%, and yield increased by 36.5% in Bv-25–treated plants compared with control. To summarize, B. velezensis strain Bv-25 strain has good potential to control root-knot nematodes both when colonizing the plant roots and through its volatile compounds.
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Claims 11
Claim · model-written summary
Bv-25 inhibited M. incognita egg hatching.
- Taxon
- cucumber
Cucumis sativuse1 - Treatment
- Bv-25e0
- Interactor
- M. incognita
_penetrates_a_tomato_root_-_USDA-ARS.jpg?width=60)
Meloidogyne incognitae2pest - Second interactor
- Bv-25e2biocontrol_agent
- Outcome
- egg hatching of M. incognitae0
- Direction
- inhibite0
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“Strain Bv-25 could inhibit the egg hatching of M. incognita and had strong nematicidal activity, with the mortality rate of second-stage M. incognita juveniles (J2s) at 100% within 12 h of exposure to Bv-25 fermentation broth.”
e1“cucumber roots”
e2“Strain Bv-25 could inhibit the egg hatching of M. incognita and had strong nematicidal activity, with the mortality rate of second-stage M. incognita juveniles (J2s) at 100% within 12 h of exposure to Bv-25 fermentation broth.”
Claim · model-written summary
Bv-25 fermentation broth caused 100% mortality of second-stage M. incognita juveniles within 12 h.
- Taxon
- cucumberCucumis sativuse1
- Treatment
- Bv-25 fermentation brothe0
- Interactor
- M. incognitaMeloidogyne incognitae2pest
- Second interactor
- Bv-25e2biocontrol_agent
- Outcome
- mortality rate of second-stage M. incognita juveniles (J2s)e0
- Value
- 100%e0
- Qualifier
- within 12 he0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Strain Bv-25 could inhibit the egg hatching of M. incognita and had strong nematicidal activity, with the mortality rate of second-stage M. incognita juveniles (J2s) at 100% within 12 h of exposure to Bv-25 fermentation broth.”
e1“cucumber roots”
e2“Strain Bv-25 could inhibit the egg hatching of M. incognita and had strong nematicidal activity, with the mortality rate of second-stage M. incognita juveniles (J2s) at 100% within 12 h of exposure to Bv-25 fermentation broth.”
Claim · model-written summary
Bv-25 fumigation suppressed three M. incognita genes after 48 h.
- Taxon
- cucumberCucumis sativuse1
- Treatment
- Bv-25 fumigation treatmente0
- Interactor
- M. incognitaMeloidogyne incognitae2pest
- Second interactor
- Bv-25e2biocontrol_agent
- Outcome
- M. incognita genes ord-1 , mpk-1 , and flp-18e0
- Direction
- suppressede0
- Qualifier
- after 48 he0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The M. incognita genes ord-1 , mpk-1 , and flp-18 were suppressed by Bv-25 fumigation treatment after 48 h.”
e1“cucumber roots”
e2“Strain Bv-25 could inhibit the egg hatching of M. incognita and had strong nematicidal activity, with the mortality rate of second-stage M. incognita juveniles (J2s) at 100% within 12 h of exposure to Bv-25 fermentation broth.”
Claim · model-written summary
Bv-25 colonized cucumber roots at 5.94 × 10 7 colony-forming units/g within 24 h.
- Taxon
- cucumberCucumis sativuse1
- Interactor
- M. incognitaMeloidogyne incognitae2pest
- Second interactor
- Bv-25e2biocontrol_agent
- Outcome
- colonize cucumber rootse0
- Value
- 5.94 × 10 7 colony-forming units/ge0
- Qualifier
- within 24 he0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Strain Bv-25 could colonize cucumber roots, with 5.94 × 10 7 colony-forming units/g attached within 24 h, effectively reducing the infection rate with J2s by 98.6%.”
e1“cucumber roots”
e2“Strain Bv-25 could inhibit the egg hatching of M. incognita and had strong nematicidal activity, with the mortality rate of second-stage M. incognita juveniles (J2s) at 100% within 12 h of exposure to Bv-25 fermentation broth.”
Claim · model-written summary
Bv-25 reduced the infection rate with J2s by 98.6%.
- Taxon
- cucumberCucumis sativuse1
- Treatment
- Bv-25e0
- Interactor
- M. incognitaMeloidogyne incognitae2pest
- Second interactor
- Bv-25e2biocontrol_agent
- Outcome
- infection rate with J2se0
- Direction
- reducinge0
- Value
- 98.6%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Strain Bv-25 could colonize cucumber roots, with 5.94 × 10 7 colony-forming units/g attached within 24 h, effectively reducing the infection rate with J2s by 98.6%.”
e1“cucumber roots”
e2“Strain Bv-25 could inhibit the egg hatching of M. incognita and had strong nematicidal activity, with the mortality rate of second-stage M. incognita juveniles (J2s) at 100% within 12 h of exposure to Bv-25 fermentation broth.”
Claim · model-written summary
The bacteria up-regulated expression of cucumber defense genes pr1, pr3 and lox1.
- Taxon
- cucumberCucumis sativuse1
- Treatment
- bacteriae0
- Interactor
- M. incognitaMeloidogyne incognitae2pest
- Second interactor
- Bv-25e2biocontrol_agent
- Outcome
- expression levels of cucumber defense response genes pr1 , pr3 , and lox1e0
- Direction
- up-regulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The bacteria up-regulated the expression levels of cucumber defense response genes pr1 , pr3 , and lox1 and induced resistance to M. incognita in split-root trials.”
e1“cucumber roots”
e2“Strain Bv-25 could inhibit the egg hatching of M. incognita and had strong nematicidal activity, with the mortality rate of second-stage M. incognita juveniles (J2s) at 100% within 12 h of exposure to Bv-25 fermentation broth.”
Claim · model-written summary
The bacteria induced cucumber resistance to M. incognita in split-root trials.
- Taxon
- cucumberCucumis sativuse1
- Treatment
- bacteriae0
- Interactor
- M. incognitaMeloidogyne incognitae2pest
- Second interactor
- Bv-25e2biocontrol_agent
- Outcome
- resistance to M. incognitae0
- Setting
- split-root trialse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The bacteria up-regulated the expression levels of cucumber defense response genes pr1 , pr3 , and lox1 and induced resistance to M. incognita in split-root trials.”
e1“cucumber roots”
e2“Strain Bv-25 could inhibit the egg hatching of M. incognita and had strong nematicidal activity, with the mortality rate of second-stage M. incognita juveniles (J2s) at 100% within 12 h of exposure to Bv-25 fermentation broth.”
Claim · model-written summary
Bv-25 reduced cucumber root knots by 73.8% in potted trials.
- Taxon
- cucumberCucumis sativuse1
- Treatment
- Bv-25e0
- Interactor
- M. incognitaMeloidogyne incognitae2pest
- Second interactor
- Bv-25e2biocontrol_agent
- Outcome
- cucumber root knotse0
- Direction
- reducede0
- Value
- 73.8%e0
- Setting
- Potted trialse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Potted trials showed that Bv-25 reduced cucumber root knots by 73.8%.”
e1“cucumber roots”
e2“Strain Bv-25 could inhibit the egg hatching of M. incognita and had strong nematicidal activity, with the mortality rate of second-stage M. incognita juveniles (J2s) at 100% within 12 h of exposure to Bv-25 fermentation broth.”
Claim · model-written summary
Bv-25 reduced disease index by 61.6% relative to control in the field.
- Taxon
- cucumberCucumis sativuse1
- Treatment
- Bv-25–treated plantse0
- Interactor
- M. incognitaMeloidogyne incognitae2pest
- Second interactor
- Bv-25e2biocontrol_agent
- Outcome
- disease indexe0
- Direction
- reducede0
- Value
- 61.6%e0
- Comparator
- controle0
- Setting
- field experimente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The field experiment demonstrated that disease index was reduced by 61.6%, cucumber height increased by 14.4%, and yield increased by 36.5% in Bv-25–treated plants compared with control.”
e1“cucumber roots”
e2“Strain Bv-25 could inhibit the egg hatching of M. incognita and had strong nematicidal activity, with the mortality rate of second-stage M. incognita juveniles (J2s) at 100% within 12 h of exposure to Bv-25 fermentation broth.”
Claim · model-written summary
Bv-25 increased cucumber height by 14.4% relative to control in the field.
- Taxon
- cucumberCucumis sativuse1
- Treatment
- Bv-25–treated plantse0
- Interactor
- M. incognitaMeloidogyne incognitae2pest
- Second interactor
- Bv-25e2biocontrol_agent
- Outcome
- cucumber heighte0
- Direction
- increasede0
- Value
- 14.4%e0
- Comparator
- controle0
- Setting
- field experimente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The field experiment demonstrated that disease index was reduced by 61.6%, cucumber height increased by 14.4%, and yield increased by 36.5% in Bv-25–treated plants compared with control.”
e1“cucumber roots”
e2“Strain Bv-25 could inhibit the egg hatching of M. incognita and had strong nematicidal activity, with the mortality rate of second-stage M. incognita juveniles (J2s) at 100% within 12 h of exposure to Bv-25 fermentation broth.”
Claim · model-written summary
Bv-25 increased yield by 36.5% relative to control in the field.
- Taxon
- cucumberCucumis sativuse1
- Treatment
- Bv-25–treated plantse0
- Interactor
- M. incognitaMeloidogyne incognitae2pest
- Second interactor
- Bv-25e2biocontrol_agent
- Outcome
- yielde0
- Direction
- increasede0
- Value
- 36.5%e0
- Comparator
- controle0
- Setting
- field experimente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The field experiment demonstrated that disease index was reduced by 61.6%, cucumber height increased by 14.4%, and yield increased by 36.5% in Bv-25–treated plants compared with control.”
e1“cucumber roots”
e2“Strain Bv-25 could inhibit the egg hatching of M. incognita and had strong nematicidal activity, with the mortality rate of second-stage M. incognita juveniles (J2s) at 100% within 12 h of exposure to Bv-25 fermentation broth.”
The same questions in other papers
inoculation · Meloidogyne incognita · Cucumis sativus (cucumber)Positive and negative results
5 papers in the same direction as this paper · 2 in the opposite direction
- negative
- no effect
- positive
4 papers more in this group
See all 8 papers →solarization · Meloidogyne incognita · Cucumis sativus (cucumber)Results agree
2 papers in the same direction as this paper
- positive
- positive
processing · Meloidogyne incognita · Cucumis sativus (cucumber)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.