Abstract
Drought-induced reduction in crop growth and productivity can be compensated by increasing atmospheric carbon dioxide (CO2), a significant contributor to climate change. Drought stress (DS) affects crops worldwide due to dwindling water resources and irregular rainfall patterns. The experiment was set up under a randomized complete block design within a three-by-two factorial arrangement. Six SPAR chambers represent three blocks (10 replications each), where each chamber has 30 pots in three rows. Each chamber was maintained with 30/22 (day/night) °C temperature, with either ambient (aCO2; 420 ppm) or elevated CO2 (eCO2; 720 ppm) concentrations. This experiment was designed to address the impact of DS on the physiological and biochemical attributes and study how the eCO2 helps alleviate the adversity of DS in basil. The study demonstrated that DS + eCO2 application highly accelerated the decrease in all forms of carotene and xanthophylls. eCO2 positively influenced and increased anthocyanin (Antho) and chlorophyll (LChl). eCO2 supplementation increased LChl content in basil under DS. Furthermore, DS significantly impeded the photosynthetic system in plants by decreasing CO2 availability and causing stomatal closure. Although eCO2 did not increase net photosynthesis (Pn) activity, it decreased stomatal conductance (gs) and leaf transpiration rate (E) under DS, showing that eCO2 can improve plant water use efficiency by lowering E and gs. Peroxidase and ascorbate activity were higher due to the eCO2 supply to acclimate the basil under the DS condition. This study suggests that the combination of eCO2 during DS positively impacts basil’s photosynthetic parameters and biochemical traits than aCO2.
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Claims 7
Claim · model-written summary
Combined drought and elevated CO2 accelerated decreases in carotene and xanthophylls.
- Taxon
- Basil
Ocimum basilicumt0 - Treatment
- DS + eCO2 applicatione0
- Outcome
- all forms of carotene and xanthophyllse0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“DS + eCO2 application highly accelerated the decrease in all forms of carotene and xanthophylls”
t0“Basil (Ocimum basilicum L.)”
Claim · model-written summary
Elevated CO2 increased anthocyanin and chlorophyll.
- Taxon
- BasilOcimum basilicumt0
- Treatment
- eCO2e0
- Outcome
- anthocyanin (Antho) and chlorophyll (LChl)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“eCO2 positively influenced and increased anthocyanin (Antho) and chlorophyll (LChl)”
t0“Basil (Ocimum basilicum L.)”
Claim · model-written summary
Elevated CO2 increased chlorophyll content under drought stress.
- Taxon
- basilOcimum basilicume0
- Treatment
- eCO2 supplementatione0
- Outcome
- LChl contente0
- Direction
- increasede0
- Qualifier
- under DSe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“eCO2 supplementation increased LChl content in basil under DS”
Claim · model-written summary
Drought decreased CO2 availability and caused stomatal closure.
- Taxon
- BasilOcimum basilicumt0
- Treatment
- DSe0
- Outcome
- CO2 availability and causing stomatal closuree0
- Direction
- decreasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“DS significantly impeded the photosynthetic system in plants by decreasing CO2 availability and causing stomatal closure”
t0“Basil (Ocimum basilicum L.)”
Claim · model-written summary
Elevated CO2 did not increase net photosynthesis activity under drought.
- Taxon
- BasilOcimum basilicumt0
- Treatment
- eCO2e0
- Outcome
- net photosynthesis (Pn) activitye0
- Direction
- did not increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“eCO2 did not increase net photosynthesis (Pn) activity”
t0“Basil (Ocimum basilicum L.)”
Claim · model-written summary
Elevated CO2 decreased stomatal conductance and leaf transpiration under drought.
- Taxon
- BasilOcimum basilicumt0
- Outcome
- stomatal conductance (gs) and leaf transpiration rate (E)e0
- Direction
- decreasede0
- Qualifier
- under DSe0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“it decreased stomatal conductance (gs) and leaf transpiration rate (E) under DS”
t0“Basil (Ocimum basilicum L.)”
Claim · model-written summary
Elevated CO2 supply raised peroxidase and ascorbate activity during drought.
- Taxon
- basilOcimum basilicume0
- Treatment
- eCO2 supplye0
- Outcome
- Peroxidase and ascorbate activitye0
- Direction
- highere0
- Qualifier
- under the DS conditione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Peroxidase and ascorbate activity were higher due to the eCO2 supply to acclimate the basil under the DS condition”
The same questions in other papers
drought · quality: phytochemicals · Ocimum basilicum (basil)Results differ
3 papers in the same direction as this paper · 3 in the opposite direction
- positive
- positive
- positive
3 papers more in this group
See all 7 papers →co2 · molecular: metabolites · Ocimum basilicum (basil)Positive and negative results
1 in the opposite direction
- no effect
co2 · physiology: pigments · Ocimum basilicum (basil)Positive and negative results
1 in the opposite direction
- negative
drought · physiology: gas exchange · Ocimum basilicum (basil)Results agree
1 paper in the same direction as this paper
- negative
co2 · physiology: antioxidant enzymes · Ocimum basilicum (basil)Results agree
1 paper in the same direction as this paper
- 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.