Bacillus amyloliquefaciens PP19 regulation of microbial communities and suppression of Peronophythora litchii
Bibliographic record
Abstract
BACKGROUND: Litchi downy blight (LDB) is a major disease affecting litchi (Litchi chinensis), damaging fruits, inflorescences, and leaves, and significantly hindering the development of the litchi industry in China and globally. Bacillus amyloliquefaciens PP19 has demonstrated significant biocontrol efficacy against LDB, but its mechanism of action remains unclear. RESULTS: This study used microbiome analysis and bacterial interaction studies to investigate the biocontrol mechanism by which PP19 regulates core microbial communities on litchi exocarps to suppress LDB. First, 16S rRNA diversity analysis revealed that PP19 pretreatment effectively prevented bacterial diversity imbalances caused by Peronophythora litchii infection, maintaining microbial stability by regulating the abundance of specific genera (Actinomycetospora, Paenibacillus, and Spirosoma). Microbial interaction networks and functional prediction revealed that PP19 might modulate bacterial motility pathways, resulting in changes to the abundance of specific microbial communities on litchi exocarps. These changes facilitated the formation of a core microbiome negatively correlated with the abundance of P. litchii. By isolating and genetically identifying 83 cultivable bacterial strains from litchi exocarps and using correlation analysis, 16 candidate strains with potentially significant interactions with PP19 and P. litchii SC18 were identified. Plate antagonism, liquid co-culture, and leaf biocontrol efficacy analyses ultimately identified four representative strains (Sphingomonas sp. F14, Rhizobium sp. F26, Pseudomonas sp. F32, and Enterobacter cloacae F63) with significant interactions with either PP19 or P. litchii. Interaction, motility, and biofilm production analyses showed that PP19 interacted with the four litchi exocarp bacteria to prevent disease through various mechanisms, and enhanced their motility and biofilm production to varying degrees. CONCLUSIONS: PP19 regulates core microbial communities on litchi exocarps, maintaining community stability and enriching interacting strains which together inhibit the growth of P. litchii, thereby achieving biocontrol efficacy. Video Abstract.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".