Diversity of plant growth-promoting Paenibacillus mucilaginosus isolated from vegetable fields in Zhejiang, China
Bibliographic record
Abstract
Paenibacillus mucilaginosus is a biofertilizer used widely for its P-, K-mineralizing and N 2 -fixing activities. The phenotypic and genotypic diversities of 27 P. mucilaginosus strains or isolates were investigated. The strains had some shared morphological and biochemical characteristics, yet they displayed some diversities. Colony and capsule size varied from 2.00 to 5.72 mm and 200.07 to 857.23 μm 2 , respectively. Polysaccharide production was 2.04–13.12 mg mL −1 , which correlated positively with both capsule ( r = 0.714) and colony ( r = 0.824) sizes. A pH decrease of 1.21–2.62 was correlated positively with the dissolution of P ( r = 0.777) and K ( r = 0.778). The dissolved P and K concentrations were 0.05–102.72 mg L −1 and 0.02–27.92 mg L −1 , respectively. The fixed nitrogen concentration was 0.47–18.28 mg L −1 . These bacteria also revealed genotypic diversity at gene, repetitive sequence and genome levels. Altogether, 249 bands were amplified using 18 random amplified polymorphic DNA (RAPD) primers, and the resulting dendrogram showed that the strains were grouped into two clusters according to their origins. Each cluster was divided into two branches: one with higher polysaccharide and acid production, and one with lower production. The gyr B gene and enterobacterial repetitive intergenic consensus (ERIC) gave similar results. In conclusion, as P. mucilaginosus genetic variability described by RAPD and gyr B gene analyses showed some correspondence with polysaccharide and acid diversity, the molecular characterization methods employed in the present study can be utilized in identification of strains with functions in P-, K -mineralizing and N 2 -fixing. Further work is necessary to determine the exact biomarker(s) of these functions.
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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".