Abstract
The effects of nitrogen [75 and 150 kg (N) ha-1] and elevated CO2 on growth, photosynthetic rate, contents of soluble leaf proteins and activities of ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) and nitrate reductase (NR) were studied on wheat (Triticum aestivum L. cv. HD-2285) grown in open top chambers under either ambient (AC) or elevated (EC) CO2 concentration (350 ± 50, 600 ± 50 μmol mol-1) and analyzed at 40, 60 and 90 d after sowing. Plants grown under EC showed greater photosynthetic rate and were taller and attained greater leaf area along with higher total plant dry mass at all growth stages than those grown under AC. Total soluble and Rubisco protein contents decreased under EC but the activation of Rubisco was higher at EC with higher N supply. Nitrogen increased the NR activity whereas EC reduced it. Thus, EC causes increased growth and PN ability per unit uptake of N in wheat plants, even if N is limiting.
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Claims 7
Claim · model-written summary
Elevated CO2 increased wheat photosynthetic rate relative to ambient CO2 at all growth stages.
- Taxon
- wheat
Triticum aestivumt0 - Treatment
- ECe0
- Outcome
- photosynthetic ratee0
- Direction
- greatere0
- Qualifier
- at all growth stagese0
- Comparator
- ACe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants grown under EC showed greater photosynthetic rate and were taller and attained greater leaf area along with higher total plant dry mass at all growth stages than those grown under AC.”
t0“wheat”
Claim · model-written summary
Elevated CO2 increased wheat height, leaf area and total dry mass at all growth stages.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- ECe0
- Outcome
- taller and attained greater leaf area along with higher total plant dry masse0
- Direction
- greatere0
- Qualifier
- at all growth stagese0
- Comparator
- ACe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants grown under EC showed greater photosynthetic rate and were taller and attained greater leaf area along with higher total plant dry mass at all growth stages than those grown under AC.”
t0“wheat”
Claim · model-written summary
Elevated CO2 reduced total soluble protein and Rubisco protein content.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- ECe0
- Outcome
- Total soluble and Rubisco protein contentse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total soluble and Rubisco protein contents decreased under EC”
t0“wheat”
Claim · model-written summary
Rubisco activation was higher under elevated CO2 with higher nitrogen supply.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- EC with higher N supplye0
- Gene
- Rubiscoe0
- Outcome
- activation of Rubiscoe0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the activation of Rubisco was higher at EC with higher N supply”
t0“wheat”
Claim · model-written summary
Nitrogen supply increased nitrate reductase activity.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- Nitrogene0
- Outcome
- NR activitye0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen increased the NR activity”
t0“wheat”
Claim · model-written summary
Elevated CO2 reduced nitrate reductase activity.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- ECe0
- Outcome
- NR activitye1
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“EC reduced it”
e1“Nitrogen increased the NR activity”
t0“wheat”
Claim · model-written summary
Elevated CO2 increased wheat growth and photosynthetic ability per unit nitrogen uptake even under nitrogen limitation.
- Taxon
- wheatTriticum aestivume0
- Treatment
- ECe0
- Outcome
- growth and PN ability per unit uptake of Ne0
- Direction
- increasede0
- Qualifier
- even if N is limitinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“EC causes increased growth and PN ability per unit uptake of N in wheat plants, even if N is limiting.”
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See all 120 papers →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.