Abstract
Abstract Plant pathogens cause significant crop losses worldwide and present significant challenges to reliable food systems. The hemibiotroph Phytophthora capsici is ranked within the top 10 most problematic oomycete plant pathogens. P. capsici induces significant damage to plants by causing root rot, stem blight, and fruit rot, leading to decreased crop yields, economic losses, and increased plant susceptibility to secondary infections. The current study tested the hypothesis that plant growth promoting rhizobacteria (PGPR), namely Bacillus velezensis UQ9000N and Pseudomonas azotoformans UQ4510An, have inhibitory effects against various fungi and oomycetes. This study also hypothesised that the plant genotype affects the capability of UQ4510An to control P. capsici infection. Our results revealed that B. velezensis UQ9000N and P. azotoformans UQ4510An inhibited the growth of several plant pathogens by 50% or higher. These bacteria also induced abnormal mycelial morphology of P. capsici and Fusarium oxysporum f. sp. lycopersici . Moreover, P. azotoformans UQ4510An exhibited anti-oomycete activity in vitro and in planta, by reducing symptoms of P. capsici infection in various tomato plant cultivars in a genotype-dependent manner. Some tomato cultivars which presented less improvements of phenotypic parameters from the UQ4510An inoculation in the absence of the pathogen had a more pronounced reduction in symptoms upon P. capsici infection. Furthermore, our results indicated that the main biocontrol mechanism of P. azotoformans UQ4510An against P. capsici is a combination of direct antagonism and induction of induced systemic resistance (ISR) involving a hypersensitive response (HR) in the plant host at early stages of infection.
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Claims 8
Claim · model-written summary
B. velezensis UQ9000N inhibited several plant pathogens by at least 50%.
- Taxon
- tomato
Solanum lycopersicumt0 - Treatment
- B. velezensis UQ9000Ne0
- Interactor
- plant pathogense0pathogen
- Second interactor
- B. velezensis UQ9000N
Bacillus velezensise0biocontrol_agent - Outcome
- growth of several plant pathogense0
- Direction
- inhibitede0
- Value
- 50% or highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“B. velezensis UQ9000N and P. azotoformans UQ4510An inhibited the growth of several plant pathogens by 50% or higher.”
t0“tomato”
Claim · model-written summary
P. azotoformans UQ4510An inhibited several plant pathogens by at least 50%.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- P. azotoformans UQ4510Ane0
- Interactor
- plant pathogense0pathogen
- Second interactor
- P. azotoformans UQ4510AnPseudomonas azotoformanse0biocontrol_agent
- Outcome
- growth of several plant pathogense0
- Direction
- inhibitede0
- Value
- 50% or highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“B. velezensis UQ9000N and P. azotoformans UQ4510An inhibited the growth of several plant pathogens by 50% or higher.”
t0“tomato”
Claim · model-written summary
The bacteria induced abnormal P. capsici mycelial morphology.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- These bacteriae0
- Interactor
- P. capsicie0pathogen
- Outcome
- abnormal mycelial morphology of P. capsicie0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These bacteria also induced abnormal mycelial morphology of P. capsici and Fusarium oxysporum f. sp. lycopersici .”
t0“tomato”
Claim · model-written summary
The bacteria induced abnormal Fusarium oxysporum mycelial morphology.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- These bacteriae0
- Interactor
- Fusarium oxysporum f. sp. lycopersici
Fusarium oxysporum f. sp. lycopersicie0pathogen - Outcome
- abnormal mycelial morphology of P. capsici and Fusarium oxysporum f. sp. lycopersicie0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These bacteria also induced abnormal mycelial morphology of P. capsici and Fusarium oxysporum f. sp. lycopersici .”
t0“tomato”
Claim · model-written summary
P. azotoformans UQ4510An had anti-oomycete activity in vitro.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- P. azotoformans UQ4510Ane0
- Interactor
- P. azotoformans UQ4510AnPseudomonas azotoformanse0biocontrol_agent
- Outcome
- anti-oomycete activity in vitroe0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“P. azotoformans UQ4510An exhibited anti-oomycete activity in vitro and in planta”
t0“tomato”
Claim · model-written summary
P. azotoformans UQ4510An reduced P. capsici symptoms in tomato cultivars with genotype-dependent efficacy.
- Taxon
- tomatoSolanum lycopersicume0
- Interactor
- P. capsicie0pathogen
- Outcome
- symptoms of P. capsici infectione0
- Direction
- reducinge0
- Qualifier
- genotype-dependent mannere0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reducing symptoms of P. capsici infection in various tomato plant cultivars in a genotype-dependent manner.”
Claim · model-written summary
Cultivars with less phenotypic improvement from inoculation without pathogen had greater symptom reduction when infected.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- UQ4510An inoculatione0
- Interactor
- P. capsicie0pathogen
- Outcome
- reduction in symptoms upon P. capsici infectione0
- Direction
- more pronounced reductione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Some tomato cultivars which presented less improvements of phenotypic parameters from the UQ4510An inoculation in the absence of the pathogen had a more pronounced reduction in symptoms upon P. capsici infection.”
Claim · model-written summary
The authors identified direct antagonism and early plant ISR with hypersensitive response as the main biocontrol mechanism.
- Taxon
- tomatoSolanum lycopersicumt0
- Interactor
- P. capsicie0pathogen
- Second interactor
- P. azotoformans UQ4510AnPseudomonas azotoformanse0biocontrol_agent
- Outcome
- biocontrol mechanisme0
- Qualifier
- direct antagonism and induction of induced systemic resistance (ISR) involving a hypersensitive response (HR)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the main biocontrol mechanism of P. azotoformans UQ4510An against P. capsici is a combination of direct antagonism and induction of induced systemic resistance (ISR) involving a hypersensitive response (HR) in the plant host at early stages of infection.”
t0“tomato”
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386 papers in the same direction as this paper · 53 in the opposite direction · 1 reporting no difference from an alternative
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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.