Abstract
Plant growth-promoting bacteria (PGPB) inoculants have been applied worldwide. However, the ecological roles of PGPB under different soil conditions are still not well understood. The present study aimed to explore the ecological roles of Bacillus amyloliquefaciens FH-1 (FH) on cucumber seedlings, rhizosphere soil properties, and the bacterial community in pot experiments. The results showed that FH had significant effects on cucumber seedlings and the rhizosphere bacterial community but not on soil properties. The FH promoted cucumber seedlings growth, reduced the rhizosphere bacterial diversity, increased Proteobacteria, and decreased Acidobacteria. Linear discriminant analysis (LDA) effect size (LEfSe) revealed that FH enriched two taxa (GKS2_174 and Nannocystaceae) and inhibited 18 taxa (mainly Acidobacteria, Actinobacteria, BRC1, Chloroflexi, Plantctomycetes, and Verrucomicrobia). Co-occurrence network analysis demonstrated that FH increased bacteria-bacteria interactions and that Bacillus (genus of FH) had few interactions with the enriched and inhibited taxa. This might indicate that FH does not directly affect the enriched and inhibited taxa. Correlation analysis results displayed that cucumber seedlings' weight and height/length (except root length) were significantly correlated with the 18 inhibited taxa and the enriched taxa Nannocystaceae. It was speculated that FH might promote cucumber seedling growth by indirectly enriching Nannocystaceae and inhibiting some taxa from Acidobacteria, Actinobacteria, BRC1, Chloroflexi, Plantctomycetes, and Verrucomicrobia.
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Claims 11
Claim · model-written summary
FH promoted cucumber seedling growth.
- Taxon
- cucumber seedlings
Cucumis sativuse0 - Treatment
- FHe0
- Interactor
- FHe0symbiont
- Outcome
- cucumber seedlings growthe0
- Direction
- promotede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The FH promoted cucumber seedlings growth, reduced the rhizosphere bacterial diversity, increased Proteobacteria, and decreased Acidobacteria.”
Claim · model-written summary
FH reduced rhizosphere bacterial diversity.
- Taxon
- cucumber seedlingsCucumis sativust0
- Treatment
- FHe0
- Interactor
- FHe0symbiont
- Outcome
- rhizosphere bacterial diversitye0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The FH promoted cucumber seedlings growth, reduced the rhizosphere bacterial diversity, increased Proteobacteria, and decreased Acidobacteria.”
t0“cucumber seedlings”
Claim · model-written summary
FH increased rhizosphere Proteobacteria.
- Taxon
- cucumber seedlingsCucumis sativust0
- Treatment
- FHe0
- Interactor
- ProteobacteriaPseudomonadotae0other
- Second interactor
- FHe0symbiont
- Outcome
- Proteobacteriae0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The FH promoted cucumber seedlings growth, reduced the rhizosphere bacterial diversity, increased Proteobacteria, and decreased Acidobacteria.”
t0“cucumber seedlings”
Claim · model-written summary
FH decreased rhizosphere Acidobacteria.
- Taxon
- cucumber seedlingsCucumis sativust0
- Treatment
- FHe0
- Interactor
- AcidobacteriaAcidobacteriotae0other
- Second interactor
- FHe0symbiont
- Outcome
- Acidobacteriae0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The FH promoted cucumber seedlings growth, reduced the rhizosphere bacterial diversity, increased Proteobacteria, and decreased Acidobacteria.”
t0“cucumber seedlings”
Claim · model-written summary
FH had no effect on soil properties.
- Taxon
- cucumber seedlingsCucumis sativuse0
- Treatment
- FHe0
- Interactor
- FHe0symbiont
- Outcome
- soil propertiese0
- Direction
- note0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“FH had significant effects on cucumber seedlings and the rhizosphere bacterial community but not on soil properties.”
Claim · model-written summary
FH enriched GKS2_174 and Nannocystaceae.
- Taxon
- cucumber seedlingsCucumis sativust0
- Treatment
- FHe0
- Interactor
- FHe0symbiont
- Outcome
- GKS2_174 and Nannocystaceaee0
- Direction
- enrichede0
- Value
- twoe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“FH enriched two taxa (GKS2_174 and Nannocystaceae) and inhibited 18 taxa (mainly Acidobacteria, Actinobacteria, BRC1, Chloroflexi, Plantctomycetes, and Verrucomicrobia).”
t0“cucumber seedlings”
Claim · model-written summary
FH inhibited 18 taxa.
- Taxon
- cucumber seedlingsCucumis sativust0
- Treatment
- FHe0
- Interactor
- FHe0symbiont
- Outcome
- 18 taxae0
- Direction
- inhibitede0
- Value
- 18e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“FH enriched two taxa (GKS2_174 and Nannocystaceae) and inhibited 18 taxa (mainly Acidobacteria, Actinobacteria, BRC1, Chloroflexi, Plantctomycetes, and Verrucomicrobia).”
t0“cucumber seedlings”
Claim · model-written summary
FH increased bacteria-bacteria interactions.
- Taxon
- cucumber seedlingsCucumis sativust0
- Treatment
- FHe0
- Interactor
- FHe0symbiont
- Outcome
- bacteria-bacteria interactionse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“FH increased bacteria-bacteria interactions”
t0“cucumber seedlings”
Claim · model-written summary
Bacillus had few interactions with taxa enriched or inhibited by FH.
- Taxon
- cucumber seedlingsCucumis sativust0
- Interactor
- Bacilluse0symbiont
- Outcome
- few interactions with the enriched and inhibited taxae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Bacillus (genus of FH) had few interactions with the enriched and inhibited taxa.”
t0“cucumber seedlings”
Claim · model-written summary
Seedling weight and height or length except root length correlated significantly with the inhibited taxa and Nannocystaceae.
- Taxon
- cucumber seedlingsCucumis sativuse0
- Interactor
- NannocystaceaeNannocystaceaee0other
- Outcome
- cucumber seedlings' weight and height/lengthe0
- Qualifier
- except root lengthe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cucumber seedlings' weight and height/length (except root length) were significantly correlated with the 18 inhibited taxa and the enriched taxa Nannocystaceae.”
Claim · model-written summary
The authors speculate that indirect bacterial community changes promote seedling growth.
- Taxon
- cucumber seedlingCucumis sativuse0
- Interactor
- NannocystaceaeNannocystaceaee0other
- Outcome
- cucumber seedling growthe0
- Qualifier
- indirectly enriching Nannocystaceae and inhibiting some taxae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“FH might promote cucumber seedling growth by indirectly enriching Nannocystaceae and inhibiting some taxa from Acidobacteria, Actinobacteria, BRC1, Chloroflexi, Plantctomycetes, and Verrucomicrobia.”