Abstract
Plant growth promoting rhizobacteria (PGPR) are the rhizosphere bacteria that may be utilized to augment plant growth and suppress plant diseases. The objectives of this study were to identify and characterize PGPR indigenous to cucumber rhizosphere in Bangladesh, and to evaluate their ability to suppress Phytophthora crown rot in cucumber. A total of 66 isolates were isolated, out of which 10 (PPB1, PPB2, PPB3, PPB4, PPB5, PPB8, PPB9, PPB10, PPB11, and PPB12) were selected based on their in vitro plant growth promoting attributes and antagonism of phytopathogens. Phylogenetic analysis of 16S rRNA sequences identified these isolates as new strains of Pseudomonas stutzeri, Bacillus subtilis, Stenotrophomonas maltophilia, and Bacillus amyloliquefaciens. The selected isolates produced high levels (26.78-51.28 μg mL(-1)) of indole-3-acetic acid, while significant acetylene reduction activities (1.79-4.9 μmole C2H4 mg(-1) protein h(-1)) were observed in eight isolates. Cucumber plants grown from seeds that were treated with these PGPR strains displayed significantly higher levels of germination, seedling vigour, growth, and N content in root and shoot tissue compared to non-treated control plants. All selected isolates were able to successfully colonize the cucumber roots. Moreover, treating cucumber seeds with these isolates significantly suppressed Phytophthora crown rot caused by Phytophthora capsici, and characteristic morphological alterations in P. capsici hyphae that grew toward PGPR colonies were observed. Since these PGPR inoculants exhibited multiple traits beneficial to the host plants, they may be applied in the development of new, safe, and effective seed treatments as an alternative to chemical fungicides.
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Claims 10
Claim · model-written summary
Ten cucumber rhizobacterial isolates were selected for plant-growth-promoting attributes and pathogen antagonism.
- Taxon
- Cucumber
Cucumis sativust0 - Interactor
- phytopathogense0pathogen
- Outcome
- plant growth promoting attributes and antagonism of phytopathogense0
- Value
- 10e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“10 (PPB1, PPB2, PPB3, PPB4, PPB5, PPB8, PPB9, PPB10, PPB11, and PPB12) were selected based on their in vitro plant growth promoting attributes and antagonism of phytopathogens.”
t0“Cucumber”
Claim · model-written summary
Selected cucumber rhizobacteria were identified as new strains of four bacterial species.
- Taxon
- CucumberCucumis sativust0
- Outcome
- new strains of Pseudomonas stutzeri, Bacillus subtilis, Stenotrophomonas maltophilia, and Bacillus amyloliquefaciense0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phylogenetic analysis of 16S rRNA sequences identified these isolates as new strains of Pseudomonas stutzeri, Bacillus subtilis, Stenotrophomonas maltophilia, and Bacillus amyloliquefaciens.”
t0“Cucumber”
Claim · model-written summary
Selected isolates produced 26.78-51.28 μg mL(-1) indole-3-acetic acid.
- Taxon
- CucumberCucumis sativust0
- Outcome
- indole-3-acetic acide0
- Direction
- high levelse0
- Value
- 26.78-51.28 μg mL(-1)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The selected isolates produced high levels (26.78-51.28 μg mL(-1)) of indole-3-acetic acid”
t0“Cucumber”
Claim · model-written summary
Eight selected isolates showed significant acetylene reduction activities of 1.79-4.9 μmole C2H4 mg(-1) protein h(-1).
- Taxon
- CucumberCucumis sativust0
- Outcome
- acetylene reduction activitiese0
- Value
- 1.79-4.9 μmole C2H4 mg(-1) protein h(-1)e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significant acetylene reduction activities (1.79-4.9 μmole C2H4 mg(-1) protein h(-1)) were observed in eight isolates.”
t0“Cucumber”
Claim · model-written summary
PGPR seed treatment significantly increased cucumber germination, seedling vigour and growth versus untreated control.
- Taxon
- CucumberCucumis sativuse0
- Treatment
- treated with these PGPR strainse0
- Interactor
- PGPR strainse0symbiont
- Outcome
- germination, seedling vigour, growthe0
- Direction
- highere0
- Comparator
- non-treated control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cucumber plants grown from seeds that were treated with these PGPR strains displayed significantly higher levels of germination, seedling vigour, growth, and N content in root and shoot tissue compared to non-treated control plants.”
Claim · model-written summary
PGPR seed treatment significantly increased cucumber root and shoot N content versus untreated controls.
- Taxon
- CucumberCucumis sativuse0
- Treatment
- treated with these PGPR strainse0
- Interactor
- PGPR strainse0symbiont
- Outcome
- N content in root and shoot tissuee0
- Direction
- highere0
- Comparator
- non-treated control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cucumber plants grown from seeds that were treated with these PGPR strains displayed significantly higher levels of germination, seedling vigour, growth, and N content in root and shoot tissue compared to non-treated control plants.”
Claim · model-written summary
All selected isolates colonized cucumber roots.
- Taxon
- cucumberCucumis sativuse0
- Interactor
- selected isolatese0symbiont
- Outcome
- colonize the cucumber rootse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All selected isolates were able to successfully colonize the cucumber roots.”
Claim · model-written summary
Treating cucumber seeds with selected isolates significantly suppressed Phytophthora crown rot.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- treating cucumber seeds with these isolatese0
- Interactor
- Phytophthora capsici
.jpg?width=60)
Phytophthora capsicie0pathogen - Second interactor
- these isolatese0biocontrol_agent
- Outcome
- Phytophthora crown rote0
- Direction
- suppressede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“treating cucumber seeds with these isolates significantly suppressed Phytophthora crown rot caused by Phytophthora capsici”
Claim · model-written summary
P. capsici hyphae growing toward PGPR colonies showed morphological alterations.
- Taxon
- CucumberCucumis sativust0
- Interactor
- P. capsicie0pathogen
- Second interactor
- PGPRe0biocontrol_agent
- Outcome
- morphological alterations in P. capsici hyphaee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“characteristic morphological alterations in P. capsici hyphae that grew toward PGPR colonies were observed.”
t0“Cucumber”
Claim · model-written summary
The authors propose PGPR isolates as seed treatments in place of chemical fungicides.
- Taxon
- CucumberCucumis sativust0
- Outcome
- new, safe, and effective seed treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“they may be applied in the development of new, safe, and effective seed treatments as an alternative to chemical fungicides.”
t0“Cucumber”
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See all 121 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.