Abstract
Carbon quantum dots (CQDs), characterized by their unique structure and remarkable fluorescence properties, could affect physiological efficiency under heavy metal stress by contributing to metal detoxification and ion homeostasis at the cellular level. Thus, a pot experiment with a factorial arrangement (in three replicates) was laid out to investigate the effects of foliar application of CQDs (0, 2, 4, 6, and 8 mg L −1 ) under various cadmium levels (0, 25 and 50 mg kg −1 ) in Dracocephalum moldavica (dragonhead) plants. Foliar application of CQDs with 4 mg L⁻¹ concentration (optimal level) mitigated cadmium stress via an enhancement in vacuolar H+-ATPase activity and nutrient uptake. The CQDs also decreased salicylic acid content, reactive oxygen species generation, lipid peroxidation, and antioxidant enzymes activities, while improved photosynthetic performance, including relative electron transport rate, maximum efficiency of photosystem II (Fv/Fm), Rubisco activity, chlorophyll and flavonoid contents, glucose content, and leaf area. These integrated physiological improvements led to an increase of shoot mass and essential oil yield by approximately 15% and 23% under 25 mg kg⁻¹, and 19% and 31% under 50 mg kg⁻¹ Cd toxicities, respectively. However, foliar treatment of CQDs at concentrations exceeding 4 mg L −1 did not lead to statistically significant improvements in plant performance under toxic conditions. These findings suggest that foliar application in appropriate concentrations can help CQDs’ purposeful and economical application in line with boosting the physiological efficiency and productivity of cadmium-stressed dragonhead plants.
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Claims 11
Claim · model-written summary
At 4 mg L⁻¹, CQDs enhanced vacuolar H+-ATPase activity and nutrient uptake under cadmium stress.
- Taxon
- Dracocephalum Moldavica
Dracocephalum moldavicat0 - Treatment
- CQDs with 4 mg L⁻¹ concentratione0
- Outcome
- vacuolar H+-ATPase activity and nutrient uptakee0
- Direction
- enhancemente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Foliar application of CQDs with 4 mg L⁻¹ concentration (optimal level) mitigated cadmium stress via an enhancement in vacuolar H+-ATPase activity and nutrient uptake.”
t0“Dracocephalum Moldavica”
Claim · model-written summary
CQDs decreased salicylic acid content, reactive oxygen species generation and lipid peroxidation.
- Taxon
- Dracocephalum MoldavicaDracocephalum moldavicat0
- Treatment
- CQDse0
- Outcome
- salicylic acid content, reactive oxygen species generation, lipid peroxidatione0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The CQDs also decreased salicylic acid content, reactive oxygen species generation, lipid peroxidation, and antioxidant enzymes activities”
t0“Dracocephalum Moldavica”
Claim · model-written summary
CQDs decreased antioxidant enzyme activities.
- Taxon
- Dracocephalum MoldavicaDracocephalum moldavicat0
- Treatment
- CQDse0
- Outcome
- antioxidant enzymes activitiese0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The CQDs also decreased salicylic acid content, reactive oxygen species generation, lipid peroxidation, and antioxidant enzymes activities”
t0“Dracocephalum Moldavica”
Claim · model-written summary
CQDs improved relative electron transport rate, Fv/Fm and Rubisco activity.
- Taxon
- Dracocephalum MoldavicaDracocephalum moldavicat0
- Outcome
- relative electron transport rate, maximum efficiency of photosystem II (Fv/Fm), Rubisco activitye0
- Direction
- improvede0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“while improved photosynthetic performance, including relative electron transport rate, maximum efficiency of photosystem II (Fv/Fm), Rubisco activity”
t0“Dracocephalum Moldavica”
Claim · model-written summary
CQDs improved chlorophyll, flavonoid and glucose contents.
- Taxon
- Dracocephalum MoldavicaDracocephalum moldavicat0
- Outcome
- chlorophyll and flavonoid contents, glucose contente0
- Direction
- improvede0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“while improved photosynthetic performance, including relative electron transport rate, maximum efficiency of photosystem II (Fv/Fm), Rubisco activity, chlorophyll and flavonoid contents, glucose content, and leaf area.”
t0“Dracocephalum Moldavica”
Claim · model-written summary
CQDs improved leaf area.
- Taxon
- Dracocephalum MoldavicaDracocephalum moldavicat0
- Outcome
- leaf areae0
- Direction
- improvede0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“while improved photosynthetic performance, including relative electron transport rate, maximum efficiency of photosystem II (Fv/Fm), Rubisco activity, chlorophyll and flavonoid contents, glucose content, and leaf area.”
t0“Dracocephalum Moldavica”
Claim · model-written summary
Under 25 mg kg⁻¹ Cd, shoot mass increased approximately 15%.
- Taxon
- Dracocephalum MoldavicaDracocephalum moldavicat0
- Outcome
- shoot masse0
- Direction
- increasee0
- Value
- 15%e0
- Qualifier
- 25 mg kg⁻¹e0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“an increase of shoot mass and essential oil yield by approximately 15% and 23% under 25 mg kg⁻¹”
t0“Dracocephalum Moldavica”
Claim · model-written summary
Under 25 mg kg⁻¹ Cd, essential oil yield increased approximately 23%.
- Taxon
- Dracocephalum MoldavicaDracocephalum moldavicat0
- Outcome
- essential oil yielde0
- Direction
- increasee0
- Value
- 23%e0
- Qualifier
- 25 mg kg⁻¹e0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“an increase of shoot mass and essential oil yield by approximately 15% and 23% under 25 mg kg⁻¹”
t0“Dracocephalum Moldavica”
Claim · model-written summary
Under 50 mg kg⁻¹ Cd, shoot mass increased approximately 19%.
- Taxon
- Dracocephalum MoldavicaDracocephalum moldavicat0
- Outcome
- shoot masse1
- Direction
- increasee1
- Value
- 19%e0
- Qualifier
- 50 mg kg⁻¹ Cd toxicitiese0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“19% and 31% under 50 mg kg⁻¹ Cd toxicities, respectively”
e1“an increase of shoot mass and essential oil yield”
t0“Dracocephalum Moldavica”
Claim · model-written summary
Under 50 mg kg⁻¹ Cd, essential oil yield increased approximately 31%.
- Taxon
- Dracocephalum MoldavicaDracocephalum moldavicat0
- Outcome
- essential oil yielde1
- Direction
- increasee1
- Value
- 31%e0
- Qualifier
- 50 mg kg⁻¹ Cd toxicitiese0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“19% and 31% under 50 mg kg⁻¹ Cd toxicities, respectively”
e1“an increase of shoot mass and essential oil yield”
t0“Dracocephalum Moldavica”
Claim · model-written summary
CQD concentrations above 4 mg L −1 did not significantly improve plant performance under toxic conditions.
- Taxon
- Dracocephalum MoldavicaDracocephalum moldavicat0
- Treatment
- foliar treatment of CQDs at concentrations exceeding 4 mg L −1e0
- Outcome
- plant performancee0
- Direction
- improvementse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“foliar treatment of CQDs at concentrations exceeding 4 mg L −1 did not lead to statistically significant improvements in plant performance under toxic conditions”
t0“Dracocephalum Moldavica”
The same questions in other papers
application · yield · Dracocephalum moldavicaPositive and negative results
1 in the opposite direction
- positive
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.