A change in the concentration of NaCl in soil alters the rate of hyphal extension of some arbuscular mycorrhizal fungi
Bibliographic record
Abstract
This study investigated the effect of a rapid change in the concentration of the soil solution on hyphal growth from germinated spores of three arbuscular mycorrhizal fungi: isolates of Acaulospora laevis Gerd. & Trappe, Gigaspora decipiens Hall & Abbott, and Scutellospora calospora (Nicol. & Gerd.) Walker & Sanders. Spores of either G. decipiens or S. calospora were incubated between millipore filters buried in sand that had been watered to field capacity with solutions of 0, 150, or 300 mmol/L NaCl. After 11 d, the intact pairs of filters were recovered, left undisturbed, or transferred into and further incubated in soil watered with one of the three solutions. Spores of A. laevis were incubated between filters in sand without NaCl and after 20 d were either left undisturbed or transferred to soil with 0, 50, 150, or 300 mmol/L NaCl in the soil solution for a further 11 d. The filter sandwiches were stained and opened, and determinations of spore germination, number of auxiliary cells, and length of hyphae on each were made. For G. decipiens and S. calospora, the effect of NaCl on hyphal growth was reversible. Hyphae from spores germinated in sand with 300 mmol/L NaCl showed markedly increased growth when transferred to a less saline environment. Hyphae from spores germinated in nonsaline sand continued to grow, but at a slower rate, when transferred to a saline environment. Hyphae of A. laevis continued to elongate after transfer to soil with 50 mmol/L NaCl but not 150 or 300 mmol/L NaCl. Morphological differences were observed between hyphae of G. decipiens grown in a highly saline as compared with a nonsaline substrate.Key words: soil salinity, arbuscular mycorrhizas, species and genera of arbuscular mycorrhizal fungi, hyphae.
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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 | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 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".