Nitrogen Fixation Does Not Alter the Effects of Salinity on Soybean Resistance to a Generalist Caterpillar
Bibliographic record
Abstract
Premise of research. Nitrogen deficiency, salinity, and herbivory are common stress factors faced by plants, but their simultaneous effects have been overlooked. The goal of our study was to test whether plant resistance to a generalist herbivore was altered by salt stress or symbiotic nitrogen fixation, or both.Methodology. We grew Bradyrhizobium-inoculated and noninoculated soybean plants under two salinity levels, subjected half of them to herbivory by cabbage looper larvae, and measured plant performance and resistance to herbivory.Pivotal results. Prior to herbivory, NaCl-treated plants had lower biomass, chlorophyll content, leaf trichome density, whole-plant fixed nitrogen, and biomass allocation to roots, while the levels of N, K, Ca, Mn, B, and Cl in shoot tissues were higher than in control plants. Most salt-stressed plants produced no seeds. Without salt stress, herbivory reduced plant growth by 25% and seed production by 13%. Constitutive and induced resistance decreased with salt stress but were not affected by inoculation.Conclusions. Nodule formation did not alter the negative effects of salinity on seed production or resistance to herbivory, suggesting that the benefits of biological nitrogen fixation are modest compared with the overwhelming negative effects of salt stress on soybean growth, reproduction, and ability to defend from herbivores.
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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 | 0.001 | 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 | 0.001 | 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".