Effects of light intensity and temperature on chlorophyll fluorescence in leaves of basil seedlings
Bibliographic record
Abstract
In this paper,taking Ocimum basilicum‘purple ruffles' and O.cimun gratissimum seedlings at different anthocyanin contents in leaves of two varieties as test material,effects of anthocyanin in leaves on chlorophyll fluorescence and light energy distribution in leaves of O.basilicum seedlings exposed to low(200μmol·m-2·s-1) and high(1 000μmol·m-2·s-1) light intensity after low temperature at 4 ℃ in dark for 3 hours were studied.The results showed that fluorescence parameters in leaves of O.gratissimum seedlings at low temperature were essentially unchanged under low light.The quantum yield of photochemistry(YPSⅡ) in leaves of O.basilicum‘purple ruffles' seedlings under low light after low temperature was lower than that under high light.However,the quantum yield of trans-thylakoid pH gradient and xanthophyll-regulated thermal energy dissipation(Y NPQ) was higher than that of high light.It indicated that responses of O.basilicum‘purple ruffles' and O.gratissimum seedlings to low light were different.The low light was beneficial to promote recovery in leaves of O.gratissimum seedlings after releasing low temperature stress,and low light led to O.basilicum‘purple ruffles' seedlings to extend recovery time from low temperature.The F v/F m in leaves of O.gratissimum seedlings was decreased under high light after low temperature,and photoinhibition in leaves of O.gratissimum seedlings was occurred.Photoinhibition in leaves of O.basilicum ‘purple ruffles' seedlings was not occurred under high light because of the high content of anthocyanins in leaves,which played the role of the light attenuation and filtration.The high light decreased of Y PSⅡ and increased quantum yield of thermal dissipation associated with the presence of non-functional PSⅡ(Y NF) in leaves of O.gratissimum seedlings after low temperature,while high light resulted in the increase of Y PSⅡ and the decrease of Y NPQ in leaves of O.basilicum ‘purple ruffles' seedlings after low temperature pretreatment.It concluded that anthocyanin in leaves of O.basilicum ‘purple ruffles' played a role in plant photoprotective mechanisms.
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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 | 0.001 |
| 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".