Abstract
Abstract The objective of this experiment was to investigate the responses of contrasting wheat genotypes to drought stress under ambient and elevated CO 2 environments. At anthesis, the plants from each CO 2 levels were either exposed to progressive drought or well‐watered at 95% of pot holding capacity. The results showed that for both genotypes, CO 2 elevation sensitized the plants’ response to soil drying in terms of reduction of evapotranspiration. Drought significantly reduced trans ‐zeatin (tZ) concentration in leaves, salicylic acid (SA) concentration in spikes, and physiological and yield‐related traits. However, the concentration of abscisic acid (ABA) and other phytohormones was increased under drought, which coincided with an increase in the kernel abortion. Elevated CO 2 significantly increased photosynthetic rate, but had no significant effect on yield‐related traits. Genotype L 3 possessed higher concentration of leaf tz, osmotic potential, and spike SA/ABA ratio under combined drought and elevated CO 2 as compared to genotype L 2 . L 3 also had higher thousand kernel weight (TKW) and grain yield in comparison to L 2 . The results indicate that elevated CO 2 is not necessarily increasing yield, and biophysiochemical traits in L 3 could be used as valuable selecting criteria to obtain higher TKW and grain yield in future drier and CO 2 ‐enriched environment.
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Claims 14
Claim · model-written summary
Elevated CO2 sensitized evapotranspiration reduction during soil drying in both genotypes.
- Taxon
- wheat
Triticum aestivumt0 - Treatment
- CO 2 elevatione0
- Outcome
- evapotranspiratione0
- Direction
- reductione0
- Qualifier
- for both genotypese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“for both genotypes, CO 2 elevation sensitized the plants’ response to soil drying in terms of reduction of evapotranspiration”
t0“wheat genotypes”
Claim · model-written summary
Drought reduced leaf trans-zeatin.
- Taxon
- wheatTriticum aestivumt0
- Organ / stage
- leavese0
- Treatment
- Droughte0
- Outcome
- trans ‐zeatin (tZ) concentratione0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought significantly reduced trans ‐zeatin (tZ) concentration in leaves”
t0“wheat genotypes”
Claim · model-written summary
Drought reduced salicylic acid in spikes.
- Taxon
- wheatTriticum aestivumt0
- Organ / stage
- spikese0
- Treatment
- Droughte0
- Outcome
- salicylic acid (SA) concentratione0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought significantly reduced trans ‐zeatin (tZ) concentration in leaves, salicylic acid (SA) concentration in spikes”
t0“wheat genotypes”
Claim · model-written summary
Drought reduced physiological and yield-related traits.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- Droughte0
- Outcome
- physiological and yield‐related traitse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought significantly reduced trans ‐zeatin (tZ) concentration in leaves, salicylic acid (SA) concentration in spikes, and physiological and yield‐related traits”
t0“wheat genotypes”
Claim · model-written summary
Drought increased abscisic acid and other phytohormones.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- droughte0
- Outcome
- concentration of abscisic acid (ABA) and other phytohormonese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the concentration of abscisic acid (ABA) and other phytohormones was increased under drought”
t0“wheat genotypes”
Claim · model-written summary
Increased phytohormones coincided with increased kernel abortion under drought.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- droughte0
- Compound
- abscisic acid (ABA)e0
- Outcome
- kernel abortione0
- Direction
- increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the concentration of abscisic acid (ABA) and other phytohormones was increased under drought, which coincided with an increase in the kernel abortion”
t0“wheat genotypes”
Claim · model-written summary
Elevated CO2 increased photosynthetic rate.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- Elevated CO 2e0
- Outcome
- photosynthetic ratee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Elevated CO 2 significantly increased photosynthetic rate”
t0“wheat genotypes”
Claim · model-written summary
Elevated CO2 had no significant effect on yield-related traits.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- Elevated CO 2e0
- Outcome
- yield‐related traitse0
- Direction
- no significant effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Elevated CO 2 significantly increased photosynthetic rate, but had no significant effect on yield‐related traits”
t0“wheat genotypes”
Claim · model-written summary
L3 had higher leaf trans-zeatin than L2 under combined drought and elevated CO2.
- Taxon
- wheatTriticum aestivumt0
- Material
- L 3e0
- Outcome
- concentration of leaf tze0
- Direction
- highere0
- Qualifier
- under combined drought and elevated CO 2e0
- Comparator
- L 2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Genotype L 3 possessed higher concentration of leaf tz, osmotic potential, and spike SA/ABA ratio under combined drought and elevated CO 2 as compared to genotype L 2”
t0“wheat genotypes”
Claim · model-written summary
L3 had higher osmotic potential than L2 under combined drought and elevated CO2.
- Taxon
- wheatTriticum aestivumt0
- Material
- L 3e0
- Outcome
- osmotic potentiale0
- Direction
- highere0
- Comparator
- L 2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Genotype L 3 possessed higher concentration of leaf tz, osmotic potential, and spike SA/ABA ratio under combined drought and elevated CO 2 as compared to genotype L 2”
t0“wheat genotypes”
Claim · model-written summary
L3 had a higher spike SA/ABA ratio than L2 under combined drought and elevated CO2.
- Taxon
- wheatTriticum aestivumt0
- Material
- L 3e0
- Outcome
- spike SA/ABA ratioe0
- Direction
- highere0
- Comparator
- L 2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Genotype L 3 possessed higher concentration of leaf tz, osmotic potential, and spike SA/ABA ratio under combined drought and elevated CO 2 as compared to genotype L 2”
t0“wheat genotypes”
Claim · model-written summary
L3 had higher thousand kernel weight than L2.
- Taxon
- wheatTriticum aestivumt0
- Material
- L 3e0
- Outcome
- thousand kernel weight (TKW)e0
- Direction
- highere0
- Comparator
- L 2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“L 3 also had higher thousand kernel weight (TKW) and grain yield in comparison to L 2”
t0“wheat genotypes”
Claim · model-written summary
L3 had higher grain yield than L2.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“L 3 also had higher thousand kernel weight (TKW) and grain yield in comparison to L 2”
t0“wheat genotypes”
Claim · model-written summary
L3 biophysiochemical traits could serve as selection criteria for higher kernel weight and grain yield in future drier, CO2-enriched conditions.
- Taxon
- wheatTriticum aestivumt0
- Material
- L 3e0
- Outcome
- biophysiochemical traits in L 3 could be used as valuable selecting criteria to obtain higher TKW and grain yielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“biophysiochemical traits in L 3 could be used as valuable selecting criteria to obtain higher TKW and grain yield in future drier and CO 2 ‐enriched environment”
t0“wheat genotypes”
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