Abstract
AIMS: To isolate endophytic Streptomyces strains from tomato and examine their antimicrobial activity. METHODS: Endophytic Streptomyces strains were isolated using surface-sterilization methods and identified by morphological characteristics. Antimicrobial activities were measured by the agar plate sensitivity method. Antifungal activity in vivo was measured by seedling mortality in infested soils. RESULTS: Twenty-one per cent of endophytic streptomycete isolates produced antibacterial metabolites and 41% produced antifungal metabolites in S medium. Sixty-five per cent of the most frequently isolated strains inhibited the growth of Rhizoctonia solani by the antibiosis assay but only 32% produced metabolites active against R. solani in S medium. Growth promotion and enhanced disease resistance of seedlings inoculated with Streptomyces sp. strain S30 were observed in tomato but not in cucumber seedlings. CONCLUSIONS: Endophytic Streptomyces spp. strains were successfully isolated using stringent methods and strain S30 promoted growth and enhanced resistance to R. solani in tomato seedlings. SIGNIFICANCE AND IMPACT OF THE STUDY: Endophytic streptomycetes showing antifungal activity in vitro and in vivo may indicate the potential for their use as biocontrol agents particularly of R. solani disease of tomato seedlings.
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Claims 7
Claim · model-written summary
Twenty-one per cent of endophytic streptomycete isolates produced antibacterial metabolites in S medium.
- Taxon
- tomato
Solanum lycopersicumt0 - Outcome
- antibacterial metabolitese0
- Value
- Twenty-one per cente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Twenty-one per cent of endophytic streptomycete isolates produced antibacterial metabolites”
t0“tomato (Lycopersicon esculentum) roots”
Claim · model-written summary
Forty-one per cent of endophytic streptomycete isolates produced antifungal metabolites in S medium.
- Taxon
- tomatoSolanum lycopersicumt0
- Outcome
- antifungal metabolitese0
- Value
- 41%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“41% produced antifungal metabolites in S medium”
t0“tomato (Lycopersicon esculentum) roots”
Claim · model-written summary
Sixty-five per cent of the most frequently isolated strains inhibited Rhizoctonia solani growth by antibiosis assay.
- Taxon
- tomatoSolanum lycopersicumt0
- Interactor
- Rhizoctonia solani
Rhizoctonia solanie0pathogen - Outcome
- growth of Rhizoctonia solanie0
- Direction
- inhibitede0
- Value
- Sixty-five per cente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sixty-five per cent of the most frequently isolated strains inhibited the growth of Rhizoctonia solani by the antibiosis assay”
t0“tomato (Lycopersicon esculentum) roots”
Claim · model-written summary
Thirty-two per cent produced metabolites active against R. solani in S medium.
- Taxon
- tomatoSolanum lycopersicumt0
- Interactor
- R. solaniRhizoctonia solanie0pathogen
- Outcome
- metabolites active against R. solanie0
- Value
- 32%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“only 32% produced metabolites active against R. solani in S medium”
t0“tomato (Lycopersicon esculentum) roots”
Claim · model-written summary
Inoculation with Streptomyces strain S30 promoted tomato seedling growth.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- inoculated with Streptomyces sp. strain S30e0
- Interactor
- Streptomyces sp. strain S30
Streptomyces sp.e0symbiont - Outcome
- Growth promotione0
- Direction
- promotione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Growth promotion and enhanced disease resistance of seedlings inoculated with Streptomyces sp. strain S30 were observed in tomato but not in cucumber seedlings”
Claim · model-written summary
Inoculation with Streptomyces strain S30 enhanced tomato seedling disease resistance.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- inoculated with Streptomyces sp. strain S30e0
- Interactor
- Streptomyces sp. strain S30Streptomyces sp.e0symbiont
- Outcome
- disease resistancee0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Growth promotion and enhanced disease resistance of seedlings inoculated with Streptomyces sp. strain S30 were observed in tomato but not in cucumber seedlings”
Claim · model-written summary
The inoculation effects on growth and disease resistance were absent in cucumber seedlings.
- Taxon
- cucumber
Cucumis sativuse0 - Interactor
- Streptomyces sp. strain S30Streptomyces sp.e0symbiont
- Outcome
- Growth promotion and enhanced disease resistancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Growth promotion and enhanced disease resistance of seedlings inoculated with Streptomyces sp. strain S30 were observed in tomato but not in cucumber seedlings”
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See all 441 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.