Abstract
Potato common scab (PCS), caused by pathogenic Streptomyces spp., is a serious disease in potato production worldwide. Cultural practices, such as optimizing the soil pH and irrigation, are recommended but it is often difficult to establish stable disease reductions using these methods. Traditionally, local farmers in southwest Japan have amended soils with rice bran (RB) to suppress PCS. However, the scientific mechanism underlying disease suppression by RB has not been elucidated. The present study showed that RB amendment reduced PCS by repressing the pathogenic Streptomyces population in young tubers. Amplicon sequencing analyses of 16S ribosomal RNA genes from the rhizosphere microbiome revealed that RB amendment dramatically changed bacterial composition and led to an increase in the relative abundance of gram-positive bacteria such as Streptomyces spp., and this was negatively correlated with PCS disease severity. Most actinomycete isolates derived from the RB-amended soil showed antagonistic activity against pathogenic Streptomyces scabiei and S. turgidiscabies on R2A medium. Some of the Streptomyces isolates suppressed PCS when they were inoculated onto potato plants in a field experiment. These results suggest that RB amendment increases the levels of antagonistic bacteria against PCS pathogens in the potato rhizosphere.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 8
Claim · model-written summary
Rice bran reduced potato common scab.
- Taxon
- Potato
Solanum tuberosumt0 - Treatment
- RB amendmente0
- Interactor
- pathogenic Streptomycese0pathogen
- Outcome
- PCSe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“RB amendment reduced PCS by repressing the pathogenic Streptomyces population in young tubers.”
t0“Potato”
Claim · model-written summary
Rice bran repressed pathogenic Streptomyces in young tubers.
- Taxon
- PotatoSolanum tuberosumt0
- Organ / stage
- young tuberse0
- Treatment
- RB amendmente0
- Interactor
- pathogenic Streptomycese0pathogen
- Outcome
- pathogenic Streptomyces populatione0
- Direction
- repressinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“RB amendment reduced PCS by repressing the pathogenic Streptomyces population in young tubers.”
t0“Potato”
Claim · model-written summary
Rice bran dramatically changed rhizosphere bacterial composition.
- Taxon
- PotatoSolanum tuberosumt0
- Treatment
- RB amendmente0
- Outcome
- bacterial compositione0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“RB amendment dramatically changed bacterial composition”
t0“Potato”
Claim · model-written summary
Rice bran increased relative abundance of gram-positive bacteria including Streptomyces spp.
- Taxon
- PotatoSolanum tuberosumt0
- Treatment
- RB amendmente0
- Interactor
- Streptomyces spp.
Streptomycese0pathogen - Outcome
- relative abundance of gram-positive bacteria such as Streptomyces spp.e0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“RB amendment dramatically changed bacterial composition and led to an increase in the relative abundance of gram-positive bacteria such as Streptomyces spp.”
t0“Potato”
Claim · model-written summary
Gram-positive bacterial abundance was negatively correlated with disease severity.
- Taxon
- PotatoSolanum tuberosumt0
- Outcome
- PCS disease severitye0
- Direction
- negatively correlatede0
- Qualifier
- thise0
Not reportedInteractor
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this was negatively correlated with PCS disease severity.”
t0“Potato”
Claim · model-written summary
Most actinomycete isolates antagonized pathogenic Streptomyces scabiei and S. turgidiscabies on R2A medium.
- Taxon
- PotatoSolanum tuberosumt0
- Interactor
- pathogenic Streptomyces scabiei and S. turgidiscabiesStreptomyces scabieiStreptomyces turgidiscabiese0pathogen
- Second interactor
- actinomycete isolatese0biocontrol_agent
- Outcome
- antagonistic activitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Most actinomycete isolates derived from the RB-amended soil showed antagonistic activity against pathogenic Streptomyces scabiei and S. turgidiscabies on R2A medium.”
t0“Potato”
Claim · model-written summary
Inoculated Streptomyces isolates suppressed potato common scab in a field experiment.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- inoculated onto potato plantse0
- Interactor
- Streptomyces isolatese0biocontrol_agent
- Outcome
- PCSe0
- Direction
- suppressede0
- Setting
- field experimente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Some of the Streptomyces isolates suppressed PCS when they were inoculated onto potato plants in a field experiment.”
Claim · model-written summary
Rice bran appears to increase antagonistic bacteria against common scab pathogens in the potato rhizosphere.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- RB amendmente0
- Interactor
- PCS pathogense0pathogen
- Outcome
- levels of antagonistic bacteriae0
- Direction
- increasese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“RB amendment increases the levels of antagonistic bacteria against PCS pathogens in the potato rhizosphere.”
The same questions in other papers
Oryza sativa · disease · Solanum tuberosum (potato)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- negative
- positive
other · disease · Solanum tuberosum (potato)Positive and negative results
7 papers in the same direction as this paper · 2 in the opposite direction
- negative
- no effect
- positive
6 papers more in this group
See all 10 papers →inoculation · disease · Solanum tuberosum (potato)Positive and negative results
52 papers in the same direction as this paper · 59 in the opposite direction · 1 reporting no difference from an alternative
- negative
- negative
- negative
109 papers more in this group
See all 113 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.