Effects of Different Light Intensities on Reactive Oxygen Species Metabolism and Chlorophyll Fluorescence Parameters in Leaves of Flue-curing Tobacco Seedlings after Chilling Stress
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Bibliographic record
Abstract
In this paper,the changes of reactive oxygen species and chlorophyll fluorescence parameters in leaves of flue-curing tobacco seedlings in different combinations of simulating low temperature( 8 ± 2) ℃ and light intensity( weak light: 200 μmol /( m~2·s),strong light: 1 000 μmol/( m2·s)) in the early spring of northern China after chilling stress were studied,the aim was to exploit response mechanism of regular low temperature and strong light on survival and growth of transplanting tobacco seedlings. The results showed that after low temperature for 1,2 h,the rates of production of O_2~had not changed significantly in the weak light treatment,while,the rates of production of O_2~had increased significantly in the treatment of strong light. Meanwhile the produce rate of O_2~and increasing contents of H_2O_2 in strong light were obviously higher than in weak light. The activity of SOD and APX were increased significantly in weak light after low temperature for 1,2 h and in strong light after low temperature for 1 h,while,the activity of SOD and APX were decreased mostly in the strong light after low temperature for 2 h.The changes of reactivity oxygen species in tobacco leaves under different stress resulted in the numerous MDA accumulation,the extent of membranous peroxide had been increased. Samely,the MDA contents in strong light treat-ment were more than in weak light treatment,and the MDA contents in low temperature for 2 h were more than for1 h. The parameters of Fv / Fm and Fv / Fo were not changed significantly in weak light after low temperature for 1,2 h,while,parameters of Fv / Fm and Fv / Fo were decreased mostly in the strong light after low temperature,and degree of decreasing in low temperature for 2 h were more than for 1 h.
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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) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.001 |
| 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 it