Abstract
This study aimed to explore the effects of elevated CO2 (e[CO2]) on wheat performance under drought stress, while investigating the role of eco-physiology, carbohydrate metabolic and antioxidant enzymes to predict the grain yield. Wheat genotype Lianmai6 was grown under ambient (400ppm) and elevated (800ppm) CO2 concentrations, with subsequent exposure to drought stress prior to anthesis. Leaf parameters, including photosynthetic rate (An), stomatal conductance (Gs), and transpiration rate (E), were significantly declined under drought. Grain yield parameters were adversely affected by drought stress, while An and water use efficiency (WUE) and yield traits increased under e[CO2]. Notably, the activities of certain carbohydrate metabolic enzymes were increased in sink tissues but reduced significantly in source tissues under drought conditions. However, activities phosphoglucomutase (PGM and phophoglucoisomerase (PGI) were increased in source tissues under the combined effect of drought and e[CO2]. Total antioxidant potential (TAP) decreased in both leaf and spike under drought conditions, yet increased significantly under e[CO2]. These findings suggest that e[CO2] can enhance CO2 assimilation by boosting antioxidant potential and facilitate increased supply of photosynthates through enhanced activities of various carbohydrate metabolic enzymes, ultimately the better grain yield. These findings could elucidate the partial mechanism of better grain yield in bread wheat under combined effect of e[CO2] and drought stress.
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Claims 9
Claim · model-written summary
Drought significantly reduced wheat photosynthetic rate, stomatal conductance, and transpiration rate.
- Taxon
- Wheat
Triticum aestivume1 - Treatment
- droughte0
- Outcome
- photosynthetic rate (An), stomatal conductance (Gs), and transpiration rate (E)e0
- Direction
- declinede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf parameters, including photosynthetic rate (An), stomatal conductance (Gs), and transpiration rate (E), were significantly declined under drought.”
e1“Wheat genotype Lianmai6”
Claim · model-written summary
Drought adversely affected wheat grain-yield parameters.
- Taxon
- WheatTriticum aestivume1
- Treatment
- drought stresse0
- Outcome
- Grain yield parameterse0
- Direction
- adversely affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain yield parameters were adversely affected by drought stress”
e1“Wheat genotype Lianmai6”
Claim · model-written summary
Elevated CO2 increased wheat photosynthetic rate and water-use efficiency.
- Taxon
- WheatTriticum aestivume1
- Treatment
- e[CO2]e0
- Outcome
- An and water use efficiency (WUE)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“An and water use efficiency (WUE) and yield traits increased under e[CO2]”
e1“Wheat genotype Lianmai6”
Claim · model-written summary
Elevated CO2 increased wheat yield traits.
- Taxon
- WheatTriticum aestivume1
- Treatment
- e[CO2]e0
- Outcome
- yield traitse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“An and water use efficiency (WUE) and yield traits increased under e[CO2]”
e1“Wheat genotype Lianmai6”
Claim · model-written summary
Drought increased carbohydrate-metabolic enzyme activities in sink tissues.
- Taxon
- WheatTriticum aestivume1
- Organ / stage
- sink tissuese0
- Treatment
- drought conditionse0
- Outcome
- activities of certain carbohydrate metabolic enzymese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“activities of certain carbohydrate metabolic enzymes were increased in sink tissues but reduced significantly in source tissues under drought conditions”
e1“Wheat genotype Lianmai6”
Claim · model-written summary
Drought significantly reduced carbohydrate-metabolic enzyme activities in source tissues.
- Taxon
- WheatTriticum aestivume1
- Organ / stage
- source tissuese0
- Treatment
- drought conditionse0
- Outcome
- activities of certain carbohydrate metabolic enzymese0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“activities of certain carbohydrate metabolic enzymes were increased in sink tissues but reduced significantly in source tissues under drought conditions”
e1“Wheat genotype Lianmai6”
Claim · model-written summary
Combined drought and elevated CO2 increased PGM and PGI activities in source tissues.
- Taxon
- WheatTriticum aestivume1
- Organ / stage
- source tissuese0
- Treatment
- combined effect of drought and e[CO2]e0
- Outcome
- activities phosphoglucomutase (PGM and phophoglucoisomerase (PGI)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“activities phosphoglucomutase (PGM and phophoglucoisomerase (PGI) were increased in source tissues under the combined effect of drought and e[CO2]”
e1“Wheat genotype Lianmai6”
Claim · model-written summary
Drought decreased total antioxidant potential in both wheat leaves and spikes.
- Taxon
- WheatTriticum aestivume1
- Organ / stage
- leaf and spikee0
- Treatment
- drought conditionse0
- Outcome
- Total antioxidant potential (TAP)e0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total antioxidant potential (TAP) decreased in both leaf and spike under drought conditions”
e1“Wheat genotype Lianmai6”
Claim · model-written summary
Elevated CO2 significantly increased total antioxidant potential.
- Taxon
- WheatTriticum aestivume1
- Treatment
- e[CO2]e0
- Outcome
- Total antioxidant potential (TAP)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total antioxidant potential (TAP) decreased in both leaf and spike under drought conditions, yet increased significantly under e[CO2]”
e1“Wheat genotype Lianmai6”
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