Chinese pine and ectomycorrhizal symbionts show plasticity in phosphorous absorption and high calcium adaption under different extraradical hyphal growth space
Bibliographic record
Abstract
The management of excessive calcium (Ca) absorption and enhancement of phosphorus (P) absorption present common obstacles for trees thriving in Ca-rich, P-poor soil. The extraradical mycelial network of ectomycorrhizal fungi (EMF) extends beyond root reach to transport nutrients, enhancing host plant growth. This study investigates how variations in hyphal growth space affect P absorption and adaptation to high soil Ca in Chinese pine ( Pinus tabulaeformis Carr.) seedlings in Ca-rich, P-poor soil. We grew Chinese pine seedlings in plant chambers with normal or high soil Ca, separated from a mycelium chamber with higher soil P by either a 105 µm nylon net (+Space) or a 0.45 µm nylon net (−Space) to study the growth of seedlings, P and Ca absorption, and soil nutrient availability. We found that Chinese pine seedlings in +Space conditions had greater biomass and a lower root-to-shoot ratio in normal Ca soil compared to −Space. −Space increased soil-available P concentrations and ectomycorrhizal colonization in normal Ca soil. P concentrations, however, were accumulated in the shoot, implying that Chinese pine in −Space allocated more energy to activate soil P. Chinese pine and its ectomycorrhizal symbionts also showed adaptive plasticity to increased soil Ca, with enhanced EMF colonization and biomass under +Space conditions, but reduced soil Ca in the plant chamber under −Space conditions.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| 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 source (direct Gemma or distilled Codex), 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".