Effects of Phenanthrene Polluted soils on the Growth and Chlorophyll Fluorescence Characteristics in Leaves of Sorghum bicolor×S.sudanense Seedlings
Bibliographic record
Abstract
In this paper.Sorghum bicolor×S.sudanense was taken as an experimental material,the seedlings growth,chlorophyll fluorescence characteristic and light distribution parameters were studied to investigate the protection mechanism of Sorghum bicolor×S.sudanense seedling under the soils of phenanthrene(Phe) stress.The results showed that the growth and photosynthesis of the seedlings were lightly inhibited when the Phe concentration of soils was less than 50 mg·kg~(-1),namely Sorghum bicolor×S.sudanense seedling had certain toleration to the soils of Phe stress.When the Phe concentration of soils was more than 50 mg · kg~(-1),the growth of the seedlings was inhibited significantly.With the increasing of the soils Phe concentration.The inhibition effect of Phe stress on the growth of underground part was more serious than that of aboveground part.The chlorophyll contents of Sorghum bicolor×S.sudanense seedling decreased with the Phe concentration of soils increasing.Chlorophyll a was more sensitive than chlorophyll b under the soils of Phe stress.The electron transport rate(ETR) and photochemical quenching coefficient(qP) of Sorghum bicolor×S.sudanense decreased significantly under the soils of Phe stress,and actual photochemical efficiency of PSⅡ,ETR.qP and maximum ETR of light compensation also decreased at different illumination intensities.These results indicated that the activities of PSⅡ reaction center,the rate of photosynthetic electron transport and the capability of light use.especially the light usage capability of high intensity decreased under the soils of Phe stress.But the maximal photochemical efficiency of PS Ⅱ(F_v/F_m) had minor variations under the soils of Phe stress showing no significant photoinhibition in the leaves of Sorghum bicolor×S.sudanense seedlings.The light distribution parameters of Sorghum bicolor×S.sudanense leaves was changed significantly under the soils of Phe stress.The proportion of the quantum yield of PS Ⅱ photochemistry(Y_(PSⅡ)) decreased,and the quantum yield of light-dependent and ApH-and xanthophyll-mediated regulated thermal dissipation(Y_(NPQ)) increased,that was Sorghum bicolor XS.sudanense seedlings achieved the xanthophylls cycle-dependent non-radiative energy dissipation to maintain the normal physiological function of PSⅡ,and decrease the pressure of the electron transport chain.In addition,the quantum yield or flux of thermal dissipation in non-functional PSⅡ(Y_(NF))had a small increase only as the Phe concentration of soils was upto 300 mg · kg~(-1).This showed the Phe stress of soils just decreased the activity of PSⅡ reaction centers,and did not cause a great quantity loss of PSⅡ reaction centers.
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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 | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| 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".