Abstract
With the aim of elucidating the immunizing ability of plant-growth-affecting rhizosphere pseudomonads, seeds of a susceptible bean (Phaseolus vulgaris L) cv. Bonita, were subjected to bacterization before challenging with the halo blight bacterial pathogen Pseudomonas syringae pv. phaseolicola. In the greenhouse, induced systemic resistance to halo blight was found in bean plants treated with a plant growth stimulatory strain of P. fluorescens (S 97), whereas deleterious pseudomonads MA 250 and VS 50 were found to induce susceptibility towards the disease. Immunization ability of S 97 was reduced at low inoculum densities (<107 live cells per ml) or eliminated when the suspension was autoclaved. The maximum disease protection, measured in terms of number of halo blight lesions in trifoliate leaves, was obtained at the highest inoculum concentration (108 live cells per ml). Agar diffusion assay in vitro revealed that S 97 exhibits bacteriostatic activity against the bean pathogen. It is suggested that S 97 might evolve substances already during seed germination that are translocated to the foliage; there they might accumulate around the site of bacterial multiplication and contribute to their restricted growth.
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Claims 7
Claim · model-written summary
P. fluorescens S 97 induced systemic halo blight resistance in bean plants.
- Taxon
- beane0
- Treatment
- treated with a plant growth stimulatory strain of P. fluorescens (S 97)e0
- Interactor
- P. fluorescens
.JPG?width=60)
Pseudomonas fluorescense0biocontrol_agent - Outcome
- systemic resistance to halo blighte0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.JPG?width=500)
Verbatim
e0“induced systemic resistance to halo blight was found in bean plants treated with a plant growth stimulatory strain of P. fluorescens (S 97)”
Claim · model-written summary
MA 250 induced susceptibility to halo blight.
- Taxon
- common bean
Phaseolus vulgarist0 - Treatment
- MA 250e0
- Interactor
- pseudomonadse0other
- Outcome
- susceptibility towards the diseasee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“deleterious pseudomonads MA 250 and VS 50 were found to induce susceptibility towards the disease”
t0“common bean”
Claim · model-written summary
VS 50 induced susceptibility to halo blight.
- Taxon
- common beanPhaseolus vulgarist0
- Treatment
- VS 50e0
- Interactor
- pseudomonadse0other
- Outcome
- susceptibility towards the diseasee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“deleterious pseudomonads MA 250 and VS 50 were found to induce susceptibility towards the disease”
t0“common bean”
Claim · model-written summary
S 97 protection declined at low inoculum density.
- Taxon
- common beanPhaseolus vulgarist0
- Treatment
- low inoculum densities (<107 live cells per ml)e0
- Interactor
- S 97e0biocontrol_agent
- Outcome
- Immunization ability of S 97e0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Immunization ability of S 97 was reduced at low inoculum densities (<107 live cells per ml)”
t0“common bean”
Claim · model-written summary
Autoclaving eliminated S 97 immunization ability.
- Taxon
- common beanPhaseolus vulgarist0
- Treatment
- the suspension was autoclavede0
- Interactor
- S 97e0biocontrol_agent
- Outcome
- Immunization ability of S 97e0
- Direction
- eliminatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Immunization ability of S 97 was reduced at low inoculum densities (<107 live cells per ml) or eliminated when the suspension was autoclaved”
t0“common bean”
Claim · model-written summary
The highest inoculum concentration gave maximum protection by lesion count.
- Taxon
- common beanPhaseolus vulgarist0
- Treatment
- highest inoculum concentration (108 live cells per ml)e0
- Interactor
- halo blighte0pathogen
- Outcome
- disease protectione0
- Direction
- maximume0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The maximum disease protection, measured in terms of number of halo blight lesions in trifoliate leaves, was obtained at the highest inoculum concentration (108 live cells per ml)”
t0“common bean”
Claim · model-written summary
S 97 showed bacteriostatic activity against the bean pathogen in vitro.
- Taxon
- common beanPhaseolus vulgarist0
- Interactor
- bean pathogene0pathogen
- Outcome
- bacteriostatic activity against the bean pathogene0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Agar diffusion assay in vitro revealed that S 97 exhibits bacteriostatic activity against the bean pathogen”
t0“common bean”
The same questions in other papers
Pseudomonas fluorescens · disease · Phaseolus vulgaris (common bean)Positive and negative results
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- negative
- positive
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See all 6 papers →inoculation · control · Phaseolus vulgaris (common bean)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- negative
- positive
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.