Abstract
Abstract This study analysed the alleviating effect of elevated CO 2 on stress‐induced decreases in photosynthesis and changes in carbohydrate metabolism in two wheat cultivars ( Triticum aestivum L.) of different origin. The plants were grown in ambient (400 μl l −1 ) and elevated (800 μl l −1 ) CO 2 with a day/night temperature of 15/10 °C. At the growth stages of tillering, booting and anthesis, the plants were subjected to heat stress of 40 °C for three continuous days. Photosynthetic parameters, maximum quantum efficiency of photosystem II ( PSII ) photochemistry ( F v / F m ) and contents of pigments and carbohydrates in leaves were analysed before and during the stress treatments as well as after 1 day of recovery. Heat stress reduced P N and F v / F m in both wheat cultivars, but plants grown in elevated CO 2 maintained higher P N and F v / F m in comparison with plants grown in ambient CO 2 . Heat stress reduced leaf chlorophyll contents and increased leaf sucrose contents in both cultivars grown at ambient and elevated CO 2 . The content of hexoses in the leaves increased mainly in the tolerant cultivar in response to the combination of elevated CO 2 and heat stress. The results show that heat stress tolerance in wheat is related to cultivar origin, the phenological stage of the plants and can be alleviated by elevated CO 2 . This confirms the complex interrelation between environmental factors and genotypic traits that influence crop performance under various climatic stresses.
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Claims 7
Claim · model-written summary
Heat stress reduced net photosynthesis (P N) and Fv/Fm in both wheat cultivars.
- Taxon
- wheat
Triticum aestivume0 - Treatment
- Heat stresse0
- Outcome
- P N and F v / F me0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Heat stress reduced P N and F v / F m in both wheat cultivars”
Claim · model-written summary
Wheat plants grown in elevated CO2 maintained higher P N and Fv/Fm than plants grown in ambient CO2 under heat stress.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- elevated CO 2e0
- Outcome
- P N and F v / F me0
- Direction
- highere0
- Comparator
- ambient CO 2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plants grown in elevated CO 2 maintained higher P N and F v / F m in comparison with plants grown in ambient CO 2”
t0“Wheat”
Claim · model-written summary
Heat stress reduced leaf chlorophyll contents in both wheat cultivars grown at ambient and elevated CO2.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- Heat stresse0
- Outcome
- leaf chlorophyll contentse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Heat stress reduced leaf chlorophyll contents and increased leaf sucrose contents in both cultivars grown at ambient and elevated CO 2”
t0“Wheat”
Claim · model-written summary
Heat stress increased leaf sucrose contents in both wheat cultivars grown at ambient and elevated CO2.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- Heat stresse0
- Outcome
- leaf sucrose contentse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Heat stress reduced leaf chlorophyll contents and increased leaf sucrose contents in both cultivars grown at ambient and elevated CO 2”
t0“Wheat”
Claim · model-written summary
Leaf hexose content increased mainly in the tolerant wheat cultivar in response to the combination of elevated CO2 and heat stress.
- Taxon
- WheatTriticum aestivumt0
- Material
- tolerant cultivare0
- Treatment
- combination of elevated CO 2 and heat stresse0
- Outcome
- content of hexoses in the leavese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The content of hexoses in the leaves increased mainly in the tolerant cultivar in response to the combination of elevated CO 2 and heat stress”
t0“Wheat”
Claim · model-written summary
Heat stress tolerance in wheat is related to cultivar origin and the phenological stage of the plants.
- Taxon
- wheatTriticum aestivume0
- Material
- cultivar origine0
- Organ / stage
- phenological stagee0
- Outcome
- heat stress tolerancee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“heat stress tolerance in wheat is related to cultivar origin, the phenological stage of the plants and can be alleviated by elevated CO 2”
Claim · model-written summary
Heat stress tolerance in wheat can be alleviated by elevated CO2.
- Taxon
- wheatTriticum aestivume0
- Treatment
- elevated CO 2e0
- Outcome
- heat stress tolerancee0
- Direction
- alleviatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“heat stress tolerance in wheat is related to cultivar origin, the phenological stage of the plants and can be alleviated by elevated CO 2”
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