Abstract
Bacteria associated with 6 habitats of groundnut were evaluated for their broad-spectrum antifungal activity and suppression of collar rot (Aspergillus niger) of groundnut. Three hundred and ninety-three strains were tested against 8 fungal pathogens of groundnut including 5 necrotrophic fungi, Aspergillus flavus, A. niger, Rhizoctonia bataticola, Rhizoctonia solani, and Sclerotium rolfsii, and 3 biotrophic fungi, Cercospora arachidicola, Phaeoisariopsis personata, and Puccinia arachidis. Pseudomonas sp. GRS 175, Pseudomonas aeruginosa GPS 21, GSE 18, GSE 19, and GSE 30, and their cell-free culture filtrates were highly antagonistic to all the test fungi. The cell-free culture filtrates of these bacteria were fungicidal and induced mycelial deformations including hyphal bulging and vacuolization in necrotrophic fungi. The cell-free culture filtrates at 10% (v/v) concentration significantly inhibited the spore germination of biotrophic fungi. In the greenhouse, P. aeruginosa GSE 18 emerged as an effective biocontrol agent of collar rot closely followed by P. aeruginosa GSE 19. The bacterium applied as a seed treatment reduced the pre-emergence rotting and postemergence wilting by > 60%. Pseudomonas aeruginosa GSE 18 effectively colonized the groundnut rhizosphere, both in native and in A. niger infested potting mixtures. Ninety-day-old peat formulation of P. aeruginosa GSE 18 had biocontrol ability comparable with the midlog-phase cells. Pseudomonas aeruginosa GSE 18, tolerant to thiram, in combination with the fungicide had an improved collar rot control. The present study was a successful attempt in selection of broad-spectrum and fungicide tolerant biocontrol agents that can be a useful component of integrated management of collar rot.
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Claims 9
Claim · model-written summary
Pseudomonas sp. GRS 175 and Pseudomonas aeruginosa strains GPS 21, GSE 18, GSE 19 and GSE 30 and their culture filtrates were highly antagonistic to all eight test fungal pathogens of groundnut.
- Taxon
- groundnut
Arachis hypogaeat0 - Interactor
- test fungie0pathogen
- Second interactor
- Pseudomonas aeruginosa GPS 21
Pseudomonas aeruginosae1biocontrol_agent - Outcome
- highly antagonistic to all the test fungie0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“groundnut”
e0“were highly antagonistic to all the test fungi”
e1“Pseudomonas aeruginosa GPS 21”
Claim · model-written summary
Cell-free culture filtrates of these bacteria were fungicidal.
- Taxon
- groundnutArachis hypogaeat0
- Outcome
- fungicidale0
Not reportedSecond interactor
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“groundnut”
e0“The cell-free culture filtrates of these bacteria were fungicidal”
Claim · model-written summary
Cell-free culture filtrates induced mycelial deformations including hyphal bulging and vacuolization in necrotrophic fungi.
- Taxon
- groundnutArachis hypogaeat0
- Interactor
- necrotrophic fungie0pathogen
- Outcome
- mycelial deformations including hyphal bulging and vacuolizatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“groundnut”
e0“The cell-free culture filtrates of these bacteria were fungicidal and induced mycelial deformations including hyphal bulging and vacuolization in necrotrophic fungi”
Claim · model-written summary
Cell-free culture filtrates at 10% (v/v) significantly inhibited spore germination of biotrophic fungi.
- Taxon
- groundnutArachis hypogaeat0
- Treatment
- cell-free culture filtrates at 10% (v/v) concentratione0
- Interactor
- biotrophic fungie0pathogen
- Outcome
- spore germination of biotrophic fungie0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“groundnut”
e0“The cell-free culture filtrates at 10% (v/v) concentration significantly inhibited the spore germination of biotrophic fungi”
Claim · model-written summary
In the greenhouse, P. aeruginosa GSE 18 was an effective biocontrol agent of collar rot, closely followed by P. aeruginosa GSE 19.
- Taxon
- groundnutArachis hypogaeat0
- Treatment
- P. aeruginosa GSE 18e0
- Interactor
- Aspergillus niger
Aspergillus nigere5pathogen - Second interactor
- P. aeruginosa GSE 18Pseudomonas aeruginosae0biocontrol_agent
- Outcome
- effective biocontrol agent of collar rote0
- Direction
- effectivee0
- Setting
- greenhousee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“groundnut”
e0“In the greenhouse, P. aeruginosa GSE 18 emerged as an effective biocontrol agent of collar rot closely followed by P. aeruginosa GSE 19”
e5“collar rot (Aspergillus niger)”
Claim · model-written summary
Seed treatment with the bacterium reduced pre-emergence rotting and postemergence wilting by more than 60%.
- Taxon
- groundnutArachis hypogaeat0
- Treatment
- seed treatmente0
- Interactor
- Aspergillus nigerAspergillus nigere5pathogen
- Outcome
- pre-emergence rotting and postemergence wiltinge0
- Direction
- reducede0
- Value
- > 60%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“groundnut”
e0“The bacterium applied as a seed treatment reduced the pre-emergence rotting and postemergence wilting by > 60%”
e5“collar rot (Aspergillus niger)”
Claim · model-written summary
P. aeruginosa GSE 18 effectively colonized the groundnut rhizosphere in both native and A. niger infested potting mixtures.
- Taxon
- groundnutArachis hypogaeat0
- Organ / stage
- rhizospheree0
- Interactor
- Pseudomonas aeruginosa GSE 18Pseudomonas aeruginosae0symbiont
- Outcome
- effectively colonized the groundnut rhizospheree0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“groundnut”
e0“Pseudomonas aeruginosa GSE 18 effectively colonized the groundnut rhizosphere, both in native and in A. niger infested potting mixtures”
Claim · model-written summary
Ninety-day-old peat formulation of P. aeruginosa GSE 18 had biocontrol ability comparable with midlog-phase cells.
- Taxon
- groundnutArachis hypogaeat0
- Treatment
- Ninety-day-old peat formulation of P. aeruginosa GSE 18e0
- Interactor
- P. aeruginosa GSE 18Pseudomonas aeruginosae0biocontrol_agent
- Outcome
- biocontrol abilitye0
- Direction
- comparablee0
- Comparator
- midlog-phase cellse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“groundnut”
e0“Ninety-day-old peat formulation of P. aeruginosa GSE 18 had biocontrol ability comparable with the midlog-phase cells”
Claim · model-written summary
P. aeruginosa GSE 18, tolerant to thiram, in combination with the fungicide gave improved collar rot control.
- Taxon
- groundnutArachis hypogaeat0
- Treatment
- in combination with the fungicidee0
- Interactor
- Pseudomonas aeruginosa GSE 18Pseudomonas aeruginosae0biocontrol_agent
- Outcome
- collar rot controle0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“groundnut”
e0“Pseudomonas aeruginosa GSE 18, tolerant to thiram, in combination with the fungicide had an improved collar rot control”
The same questions in other papers
seed treatment · Aspergillus niger · Arachis hypogaea (peanut)Positive and negative results
3 papers in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
- positive
1 paper more in this group
See all 5 papers →pathogen product · disease · Arachis hypogaea (peanut)Positive and negative results
5 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- positive
3 papers more in this group
See all 7 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.