Effects of <i>Paenibacillus polymyxa</i> inoculation and different soil nitrogen treatments on lodgepole pine seedling growth
Bibliographic record
Abstract
An endophytic diazotroph, Paenibacillus polymyxa P2b-2R, has been shown to colonize internal tissues of lodgepole pine (Pinus contorta var. latifolia Engelm. ex S. Watson) and stimulate seedling growth possibly through nitrogen (N) fixation in an N-limited environment. We evaluated the effects of different soil N concentrations on lodgepole pine seedling growth after inoculation with P2b-2R in a year-long greenhouse study. Seedlings were subjected to monthly application of a nutrient solution containing one of four soil N concentrations as Ca(NO 3 ) 2 (5% 15 N label): 0.0029, 0.029, 0.29, and 2.9 μmol·L –1 , referred to as very low, low, medium, and high soil N treatments, respectively. Foliar 15 N atom percent excess and foliar N content values of P2b-2R inoculated seedlings were not significantly different from controls at any N treatment. Similarly, rhizospheric and endophytic population of P2b-2R did not vary significantly across N treatments. Inoculation with P2b-2R resulted in seedling growth inhibition during early stages of the experiment; however, by month 12, inoculated seedlings from the very low soil N treatment had accumulated 56.3% and 46.4% more root and shoot biomass than controls, respectively. These results suggest that pine biomass stimulation by P2b-2R may depend on soil N concentrations and that such growth stimulation may occur without providing significant amounts of fixed N.
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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".