Abstract
Seven strains of the bacterium Gluconacetobacter diazotrophicus (formerly Acetobacter diazotrophicus) were assessed for their antagonistic efficacy against root-knot nematode (Meloidogyne incognita) infecting cotton in vitro and in planta. Cell free culture supernatant of the seven strains of G. diazotrophicus reduced egg hatching by more than 95% and exhibited a paralyzing effect on the infective juveniles of M. incognita within 24 hours. All the strains were found to excrete ammonia and volatile fatty acid during growth. Greenhouse screening of the bacterial strains indicated that all except strain 35-45 significantly enhanced the growth of nematode-infected cotton plants. These strains also reduced nematode multiplication to various extents, ranging from 36 to 69%. Evaluation of the two most effective strains in the field for three years revealed that strain 35-47 persistently and significantly increased cotton yield and reduced root-knot index. Strain Co 99-70, although found to be effective in the greenhouse, failed to produce responses in the field.
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Claims 8
Claim · model-written summary
Bacterial culture supernatants reduced nematode egg hatching by more than 95%.
- Taxon
- cotton
Gossypium hirsutume1 - Treatment
- Cell free culture supernatant of the seven strains of G. diazotrophicuse0
- Interactor
- Meloidogyne incognita
_penetrates_a_tomato_root_-_USDA-ARS.jpg?width=60)
Meloidogyne incognitae1pathogen - Second interactor
- G. diazotrophicusGluconacetobacter diazotrophicuse0biocontrol_agent
- Outcome
- egg hatchinge0
- Direction
- reducede0
- Value
- more than 95%e0
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“Cell free culture supernatant of the seven strains of G. diazotrophicus reduced egg hatching by more than 95%”
e1“Meloidogyne incognita) infecting cotton”
Claim · model-written summary
The bacterial supernatants paralyzed infective nematode juveniles within 24 hours.
- Taxon
- cottonGossypium hirsutume2
- Treatment
- G. diazotrophicuse1
- Interactor
- M. incognitaMeloidogyne incognitae0pathogen
- Second interactor
- G. diazotrophicusGluconacetobacter diazotrophicuse1biocontrol_agent
- Outcome
- paralyzing effect on the infective juveniles of M. incognitae0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exhibited a paralyzing effect on the infective juveniles of M. incognita within 24 hours”
e1“G. diazotrophicus reduced egg hatching”
e2“Meloidogyne incognita) infecting cotton”
Claim · model-written summary
All bacterial strains excreted ammonia and volatile fatty acid during growth.
- Taxon
- cottonGossypium hirsutume1
- Outcome
- excrete ammonia and volatile fatty acide0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All the strains were found to excrete ammonia and volatile fatty acid during growth”
e1“Meloidogyne incognita) infecting cotton”
Claim · model-written summary
All strains except 35-45 significantly enhanced growth of infected cotton in the greenhouse.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- bacterial strainse0
- Interactor
- Meloidogyne incognitaMeloidogyne incognitae1pathogen
- Outcome
- growth of nematode-infected cotton plantse0
- Direction
- enhancede0
- Setting
- Greenhousee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Greenhouse screening of the bacterial strains indicated that all except strain 35-45 significantly enhanced the growth of nematode-infected cotton plants”
e1“Meloidogyne incognita) infecting cotton”
Claim · model-written summary
The strains reduced nematode multiplication by 36 to 69%.
- Taxon
- cottonGossypium hirsutume1
- Treatment
- These strainse0
- Interactor
- Meloidogyne incognitaMeloidogyne incognitae1pathogen
- Outcome
- nematode multiplicatione0
- Direction
- reducede0
- Value
- 36 to 69%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These strains also reduced nematode multiplication to various extents, ranging from 36 to 69%”
e1“Meloidogyne incognita) infecting cotton”
Claim · model-written summary
Strain 35-47 significantly increased cotton yield in a three year field evaluation.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- strain 35-47e0
- Outcome
- cotton yielde0
- Direction
- increasede0
- Setting
- fielde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Evaluation of the two most effective strains in the field for three years revealed that strain 35-47 persistently and significantly increased cotton yield”
Claim · model-written summary
Strain 35-47 reduced the root knot index in field evaluation.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- strain 35-47e0
- Interactor
- Meloidogyne incognitaMeloidogyne incognitae1pathogen
- Outcome
- root-knot indexe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“strain 35-47 persistently and significantly increased cotton yield and reduced root-knot index”
e1“Meloidogyne incognita) infecting cotton”
Claim · model-written summary
Strain Co 99-70 did not produce a response in the field despite greenhouse efficacy.
- Taxon
- cottonGossypium hirsutume1
- Treatment
- Strain Co 99-70e0
- Outcome
- responses in the fielde0
- Direction
- failed to producee0
- Setting
- fielde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Strain Co 99-70, although found to be effective in the greenhouse, failed to produce responses in the field”
e1“Meloidogyne incognita) infecting cotton”
The same questions in other papers
Gluconacetobacter diazotrophicus · Meloidogyne incognita · Gossypium hirsutum (cotton)Results agree
1 paper in the same direction as this paper
- positive
inoculation · Meloidogyne incognita · Gossypium hirsutum (cotton)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- no effect
- 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.