Abstract
Application of soil amendments has been wildly used to increase soil pH and control bacterial wilt. However, little is known about causal shifts in the rhizosphere microbial community of crops, especially when the field naturally harbors the disease of bacterial wilt to tobacco for many years due to long-term continuous cropping and soil acidification. In this study, biochar (CP), lime (LM), oyster shell powder (OS) and no soil amendment additions (Control; CK) were assessed for their abilities to improve the soil acidification, change the composition of rhizosphere soil bacterial communities and thus control tobacco bacterial wilt. The results showed that oyster shell powder significantly increased soil pH by 0.77 and reduced the incidence of tobacco bacterial wilt by 36.67% compared to the control. The Illumina sequencing -based community analysis showed that soil amendment applications affected the composition of rhizosphere bacterial community and increased the richness and diversity. In contrast, the richness and diversity correlated negatively to disease incidence. Using LEfSe analyses, 11 taxa were found to be closely related with disease suppression, in which Saccharibacteria, Aeromicrobium, and Pseudoxanthomonas could be potential indicators of disease suppression. Our results suggested that the suppression of bacterial wilt after the application of soil amendments (especially oyster shell powder) was attributed to the improved soil pH and increased bacterial richness and diversity.
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Claims 8
Claim · model-written summary
Oyster shell powder increased soil pH by 0.77 relative to control.
- Taxon
- tobacco
Nicotiana tabacumt0 - Treatment
- oyster shell powdere0
- Outcome
- soil pHe0
- Direction
- increasede0
- Value
- 0.77e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“oyster shell powder significantly increased soil pH by 0.77 and reduced the incidence of tobacco bacterial wilt by 36.67% compared to the control”
t0“rhizosphere bacterial community of tobacco”
Claim · model-written summary
Oyster shell powder reduced tobacco bacterial wilt incidence by 36.67% relative to control.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- oyster shell powdere0
- Outcome
- incidence of tobacco bacterial wilte0
- Direction
- reducede0
- Value
- 36.67%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“oyster shell powder significantly increased soil pH by 0.77 and reduced the incidence of tobacco bacterial wilt by 36.67% compared to the control”
t0“rhizosphere bacterial community of tobacco”
Claim · model-written summary
Soil amendments changed rhizosphere bacterial community composition.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- soil amendment applicationse0
- Outcome
- composition of rhizosphere bacterial communitye0
- Direction
- affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soil amendment applications affected the composition of rhizosphere bacterial community and increased the richness and diversity”
t0“rhizosphere bacterial community of tobacco”
Claim · model-written summary
Soil amendments increased rhizosphere bacterial richness and diversity.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- soil amendment applicationse0
- Outcome
- richness and diversitye0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soil amendment applications affected the composition of rhizosphere bacterial community and increased the richness and diversity”
t0“rhizosphere bacterial community of tobacco”
Claim · model-written summary
Rhizosphere bacterial richness and diversity correlated negatively with disease incidence.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- richness and diversitye0
- Outcome
- disease incidencee0
- Direction
- negativelye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“richness and diversity correlated negatively to disease incidence”
t0“rhizosphere bacterial community of tobacco”
Claim · model-written summary
Eleven bacterial taxa were closely related to disease suppression.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- 11 taxae0
- Outcome
- disease suppressione0
- Direction
- closely relatede0
- Value
- 11 taxae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“11 taxa were found to be closely related with disease suppression, in which Saccharibacteria, Aeromicrobium, and Pseudoxanthomonas could be potential indicators of disease suppression”
t0“rhizosphere bacterial community of tobacco”
Claim · model-written summary
Saccharibacteria, Aeromicrobium and Pseudoxanthomonas were proposed as potential indicators of disease suppression.
- Taxon
- tobaccoNicotiana tabacumt0
- Outcome
- indicators of disease suppressione0
- Qualifier
- could be potentiale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Saccharibacteria, Aeromicrobium, and Pseudoxanthomonas could be potential indicators of disease suppression”
t0“rhizosphere bacterial community of tobacco”
Claim · model-written summary
The authors attributed amendment-associated wilt suppression to higher soil pH and bacterial richness and diversity.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- application of soil amendments (especially oyster shell powder)e0
- Outcome
- suppression of bacterial wilte0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“suppression of bacterial wilt after the application of soil amendments (especially oyster shell powder) was attributed to the improved soil pH and increased bacterial richness and diversity”
t0“rhizosphere bacterial community of tobacco”
The same questions in other papers
botanical · disease · Nicotiana tabacum (tobacco)Positive and negative results
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- no effect
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botanical · soil: chemistry · Nicotiana tabacum (tobacco)Results agree
2 papers in the same direction as this paper
- positive
- 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.