Abstract
Abstract Bacteria of the Streptomyces genus colonize diverse ecological niches and can exhibit diverse traits of potential applied value. With regards to crop production, some species can induce plant diseases while others are capable of promoting plant growth or controlling diseases. To identify Taiwanese Streptomyces strains suitable for crop growth promotion and disease management, this study obtained 49 potato-isolated, Streptomyces -like strains from a culture collection and screened for bacteria showing promise for stimulating plant growth and controlling soil-borne phytopathogenic bacteria. The tested strains were examined for their effects on radish seedling growth, and strains exhibiting detrimental effects were screened out. Antimicrobial activities of the remaining strains against the soil-borne phytopathogenic bacteria Ralstonia pseudosolanacearum and S . scabiei were determined with agar diffusion tests, and only 8 strains were found capable of inhibiting both pathogens. Results from detection of genes associated with pathogenicity ( txtAB , tomA and nec1 ) and multilocus sequence analysis (MLSA) indicated that all 8 strains were unlikely to harm plants. The strains’ ability to promote plant growth were examined using tomato plants in pot culture assays, and after two trails, strain 94-b, identified as S . nigra , exhibited the most consistent plant growth promotion activity. Strain 94-b also significantly reduced the severity of symptoms caused by R . pseudosolanacearum on tomato in a biocontrol assay. Further testing revealed that the strain produced amylase, lipase, siderophore, indole-3-acetic acid (IAA), and solubilized phosphate. This is the first report of S . nigra capable of both improving plant growth and controlling a soil-borne bacterial disease.
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Claims 6
Claim · model-written summary
Strain 94-b (S. nigra) showed the most consistent plant growth promotion of tomato.
- Taxon
- tomato
Solanum lycopersicumt0 - Treatment
- strain 94-be1
- Interactor
- S . nigraStreptomyces nigrae1symbiont
- Outcome
- most consistent plant growth promotion activitye1
- Direction
- most consistente1
- Setting
- pot culture assayse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tomato (Solanum lycopersicum)”
e1“tomato plants in pot culture assays, and after two trails, strain 94-b, identified as S . nigra , exhibited the most consistent plant growth promotion activity”
Claim · model-written summary
Strain 94-b significantly reduced the severity of Ralstonia pseudosolanacearum symptoms on tomato.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- Strain 94-be2
- Interactor
- R . pseudosolanacearumRalstonia pseudosolanacearume2pathogen
- Second interactor
- Strain 94-be2biocontrol_agent
- Outcome
- severity of symptomse2
- Direction
- reducede2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tomato (Solanum lycopersicum)”
e2“Strain 94-b also significantly reduced the severity of symptoms caused by R . pseudosolanacearum on tomato in a biocontrol assay”
Claim · model-written summary
The strain produced amylase, lipase and siderophore.
- Taxon
- tomatoSolanum lycopersicumt0
- Interactor
- S . nigraStreptomyces nigrae4symbiont
- Outcome
- amylase, lipase, siderophoree3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tomato (Solanum lycopersicum)”
e3“Further testing revealed that the strain produced amylase, lipase, siderophore, indole-3-acetic acid (IAA), and solubilized phosphate”
e4“strain 94-b, identified as S . nigra”
Claim · model-written summary
The strain produced indole-3-acetic acid (IAA) and solubilized phosphate.
- Taxon
- tomatoSolanum lycopersicumt0
- Interactor
- S . nigraStreptomyces nigrae4symbiont
- Outcome
- indole-3-acetic acid (IAA), and solubilized phosphatee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tomato (Solanum lycopersicum)”
e3“Further testing revealed that the strain produced amylase, lipase, siderophore, indole-3-acetic acid (IAA), and solubilized phosphate”
e4“strain 94-b, identified as S . nigra”
Claim · model-written summary
Only 8 of the screened strains inhibited both Ralstonia pseudosolanacearum and S. scabiei.
- Taxon
- tomatoSolanum lycopersicumt0
- Interactor
- Ralstonia pseudosolanacearumRalstonia pseudosolanacearume5pathogen
- Second interactor
- S . scabieiStreptomyces scabieie5pathogen
- Outcome
- capable of inhibiting both pathogense5
- Value
- 8 strainse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tomato (Solanum lycopersicum)”
e5“Antimicrobial activities of the remaining strains against the soil-borne phytopathogenic bacteria Ralstonia pseudosolanacearum and S . scabiei were determined with agar diffusion tests, and only 8 strains were found capable of inhibiting both pathogens”
Claim · model-written summary
All 8 strains were unlikely to harm tomato plants based on pathogenicity gene and MLSA analysis.
- Taxon
- tomatoSolanum lycopersicumt0
- Outcome
- unlikely to harm plantse6
- Qualifier
- txtAB , tomA and nec1e6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tomato (Solanum lycopersicum)”
e6“Results from detection of genes associated with pathogenicity ( txtAB , tomA and nec1 ) and multilocus sequence analysis (MLSA) indicated that all 8 strains were unlikely to harm plants”