Abstract
Native isolates of groundnut stem rot casual organism, Sclerotium rolfsii Sacc. were collected from major groundnut growing areas of Tamil Nadu. Selected isolates were screened, characterized and identified the virulent isolate. Several native bacterial and fungal antagonists were isolated against Sclerotium rolfsii Sacc. Two antagonistic actinomycetes isolates were found to have antagonistic effects on ground nut stem rot pathogen. Morphology and spore structure of isolated antagonists were studied under light microscopy, Biochemical test, Thin layer chromatography and Biolog analysis. It confirmed the group of microorganism as Streptomyces based on gram staining, medium specific growth, visual morphological characters, cell wall aminoacid studies and spore forming characters. The genus and species level of the antagonists were identified by Fatty Acids Methyl Esters (FAME) Analysis. The antagonistic activities of S. violaceusniger were found to be effective in reducing the mycelial growth, sclerotial formation and sclerotial germination. The S. violaceusniger treated cultures were shown reduced mycelial growth (85.00%) and reduced sclerotial production (87.86%).The antimicrobial components of S. violaceusniger were also found to be inhibited the growth activities of the pathogen. One bacterial and one fungal isolate viz., Pseudomonas fluorescence and Trichoderma viride was also identified, the fungal antagonist was also found to have on par results with S. violaceusniger. When antagonists and organic amendments were combined together in various combinations with each other in pot experiments and field trial the treatment containing, seed treatment of P. fluorescens @ 5g kg-1 + S. violaceusniger @ 5 g/kg was found to be effective in reducing the disease by 81.84 per cent over control followed by the seed treatment of S. violaceusniger @10 g/kg (75.06 per cent).This study provides a theoritical and practical explanation of an antagonist explored for control of stem rot caused by S. rolfsii.
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Claims 9
Claim · model-written summary
Two actinomycete isolates antagonized the groundnut stem rot pathogen.
- Taxon
- ground nut
Arachis hypogaeae0 - Outcome
- antagonistic effects on ground nut stem rot pathogene0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two antagonistic actinomycetes isolates were found to have antagonistic effects on ground nut stem rot pathogen”
Claim · model-written summary
The antagonists were identified as Streptomyces.
- Taxon
- ground nutArachis hypogaeat0
- Outcome
- confirmed the group of microorganism as Streptomycese0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It confirmed the group of microorganism as Streptomyces based on gram staining, medium specific growth, visual morphological characters, cell wall aminoacid studies and spore forming characters”
t0“ground nut”
Claim · model-written summary
S. violaceusniger reduced pathogen mycelial growth by 85.00%.
- Taxon
- ground nutArachis hypogaeat0
- Treatment
- S. violaceusniger treated culturese0
- Interactor
- S. violaceusnigerStreptomyces violaceusnigere0biocontrol_agent
- Outcome
- mycelial growthe0
- Direction
- reducede0
- Value
- 85.00%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The S. violaceusniger treated cultures were shown reduced mycelial growth (85.00%) and reduced sclerotial production (87.86%)”
t0“ground nut”
Claim · model-written summary
S. violaceusniger reduced pathogen sclerotial production by 87.86%.
- Taxon
- ground nutArachis hypogaeat0
- Treatment
- S. violaceusniger treated culturese0
- Interactor
- S. violaceusnigerStreptomyces violaceusnigere0biocontrol_agent
- Outcome
- sclerotial productione0
- Direction
- reducede0
- Value
- 87.86%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The S. violaceusniger treated cultures were shown reduced mycelial growth (85.00%) and reduced sclerotial production (87.86%)”
t0“ground nut”
Claim · model-written summary
S. violaceusniger reduced sclerotial germination.
- Taxon
- ground nutArachis hypogaeat0
- Treatment
- S. violaceusnigere0
- Interactor
- S. violaceusnigerStreptomyces violaceusnigere0biocontrol_agent
- Outcome
- sclerotial germinatione0
- Direction
- reducinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The antagonistic activities of S. violaceusniger were found to be effective in reducing the mycelial growth, sclerotial formation and sclerotial germination”
t0“ground nut”
Claim · model-written summary
Antimicrobial components of S. violaceusniger inhibited pathogen growth.
- Taxon
- ground nutArachis hypogaeat0
- Treatment
- antimicrobial components of S. violaceusnigere0
- Interactor
- S. violaceusnigerStreptomyces violaceusnigere0biocontrol_agent
- Outcome
- growth activities of the pathogene0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The antimicrobial components of S. violaceusniger were also found to be inhibited the growth activities of the pathogen”
t0“ground nut”
Claim · model-written summary
Trichoderma viride gave results comparable to S. violaceusniger.
- Taxon
- ground nutArachis hypogaeat0
- Outcome
- on par resultse0
- Comparator
- S. violaceusnigere0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the fungal antagonist was also found to have on par results with S. violaceusniger”
t0“ground nut”
Claim · model-written summary
Combined P. fluorescens and S. violaceusniger seed treatment reduced groundnut disease by 81.84%.
- Taxon
- ground nutArachis hypogaeat0
- Treatment
- seed treatment of P. fluorescens @ 5g kg-1 + S. violaceusniger @ 5 g/kge0
- Interactor
- P. fluorescens
.JPG?width=60)
Pseudomonas fluorescense0biocontrol_agent - Second interactor
- S. violaceusnigerStreptomyces violaceusnigere0biocontrol_agent
- Outcome
- the diseasee0
- Direction
- reducinge0
- Value
- 81.84 per cente0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.JPG?width=500)
Verbatim
e0“seed treatment of P. fluorescens @ 5g kg-1 + S. violaceusniger @ 5 g/kg was found to be effective in reducing the disease by 81.84 per cent over control”
t0“ground nut”
Claim · model-written summary
S. violaceusniger alone reduced disease by 75.06%.
- Taxon
- ground nutArachis hypogaeat0
- Treatment
- seed treatment of S. violaceusniger @10 g/kge0
- Interactor
- S. violaceusnigerStreptomyces violaceusnigere0biocontrol_agent
- Outcome
- seed treatmente0
- Value
- 75.06 per cente0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seed treatment of S. violaceusniger @10 g/kg (75.06 per cent)”
t0“ground nut”
The same questions in other papers
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1 in the opposite direction
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Streptomyces violaceusniger · disease · Arachis hypogaea (peanut)Results agree
1 paper in the same direction as this paper
- positive
Pseudomonas fluorescens · disease · Arachis hypogaea (peanut)Results agree
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40 papers in the same direction as this paper · 2 in the opposite direction · 1 reporting no difference from an alternative
- no effect
- no effect
- no effect
40 papers more in this group
See all 44 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.