Fluctuations of S Availability Affect Growth, S Reserves, 15N and 34S Uptake in Brassica Napus L.
Bibliographic record
Abstract
Oilseed rape is sensitive to sulphur (S) limitation and is confronted to permanent changes of S availability, resulting from soil activity and S fertilization regimes, which may affect N and S uptake, storage and remobilization.Therefore, the present study aimed to assess the influence of initial S status and mineral S availability on i) biomass production, ii) 15 N and 34 S uptake, iii) relative expression of genes encoding N or S transport systems and iv) 14 N and 32 S remobilization.As a consequence, plants with High or Low Initial S status (HS i or LS i ) were grown during 28 days either with High or Low S mineral availability (HS or LS).The results showed that with a low initial S status, plant were able under ample S supply to increase N and S uptake by de-repressing gene expression of their uptake systems, and reached similar growth as control plants.With high S reserves, mostly as sulphate, plants were yet able to compensate transient S limitation,by increasing S mobilization towards the roots, and reached similar growth as control plants.Only with low S initial status and low S availability (i.e.long term S limitation), plant growth was reduced while nitrate transporter gene expression was steadily downregulated probably as a result of amino acid accumulation in the roots.Overall results showed that plants are able to cope with fluctuating S availability, through mobilization of S reserve when previously accumulated as sulphate, or alternatively, to increase S uptake.As a conclusion, our study supports that initial S reserves play a crucial role for oilseed rape adaptation to S limitation.
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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) | 0.001 | 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".