Abstract
Abstract The productivity of many important crops is significantly threatened by water shortage, and the elevated atmospheric CO 2 can significantly interact with physiological processes and crop responses to drought. We examined the effects of three different CO 2 concentrations (historical ~300 ppm, ambient ~400 ppm and elevated ~700 ppm) on physiological traits of oilseed rape ( Brassica napus L.) seedlings subjected to well‐watered and reduced water availability. Our data show (1) that, as expected, increasing CO 2 level positively modulates leaf photosynthetic traits, leaf water‐use efficiency and growth under non‐stressed conditions, although a pronounced acclimation of photosynthesis to elevated CO 2 occurred; (2) that the predicted elevated CO 2 concentration does not reduce total evapotranspiration under drought when compared with present (400 ppm) and historical (300 ppm) concentrations because of a larger leaf area that does not buffer transpiration; and (3) that accordingly, the physiological traits analysed decreased similarly under stress for all CO 2 concentrations. Our data support the hypothesis that increasing CO 2 concentrations may not significantly counteract the negative effect of increasing drought intensity on Brassica napus performance.
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Claims 6
Claim · model-written summary
Increasing CO2 positively modulates leaf photosynthetic traits, leaf water-use efficiency and growth under non-stressed conditions.
- Taxon
- Brassica napus
_Brassica_napus_-_Habit.jpg?width=60)
Brassica napust0 - Treatment
- increasing CO 2 levele1
- Outcome
- leaf photosynthetic traits, leaf water‐use efficiency and growthe1
- Direction
- positively modulatese1
- Qualifier
- under non‐stressed conditionse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Brassica_napus_-_Habit.jpg?width=500)
Verbatim
t0“physiological performance of Brassica napus seedlings”
e1“increasing CO 2 level positively modulates leaf photosynthetic traits, leaf water‐use efficiency and growth under non‐stressed conditions”
Claim · model-written summary
Photosynthesis acclimated markedly to elevated CO2.
- Taxon
- Brassica napusBrassica napust0
- Outcome
- acclimation of photosynthesis to elevated CO 2e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“physiological performance of Brassica napus seedlings”
e2“a pronounced acclimation of photosynthesis to elevated CO 2 occurred”
Claim · model-written summary
Predicted elevated CO2 does not reduce total evapotranspiration under drought compared with present and historical CO2.
- Taxon
- Brassica napusBrassica napust0
- Treatment
- predicted elevated CO 2 concentratione3
- Outcome
- total evapotranspiration under droughte3
- Direction
- does not reducee3
- Comparator
- present (400 ppm) and historical (300 ppm) concentrationse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“physiological performance of Brassica napus seedlings”
e3“the predicted elevated CO 2 concentration does not reduce total evapotranspiration under drought when compared with present (400 ppm) and historical (300 ppm) concentrations”
Claim · model-written summary
A larger leaf area does not buffer transpiration under elevated CO2 and drought.
- Taxon
- Brassica napusBrassica napust0
- Outcome
- transpiratione4
- Qualifier
- a larger leaf areae4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“physiological performance of Brassica napus seedlings”
e4“because of a larger leaf area that does not buffer transpiration”
Claim · model-written summary
Physiological traits decreased similarly under drought for all CO2 concentrations.
- Taxon
- Brassica napusBrassica napust0
- Treatment
- under stresse5
- Outcome
- physiological traits analysede5
- Direction
- decreasede5
- Qualifier
- similarlye5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“physiological performance of Brassica napus seedlings”
e5“the physiological traits analysed decreased similarly under stress for all CO 2 concentrations”
Claim · model-written summary
Increasing CO2 may not significantly counteract the negative effect of increasing drought intensity on Brassica napus performance.
- Taxon
- Brassica napusBrassica napust0
- Treatment
- increasing CO 2 concentrationse6
- Outcome
- negative effect of increasing drought intensitye6
- Direction
- may not significantly counteracte6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“physiological performance of Brassica napus seedlings”
e6“increasing CO 2 concentrations may not significantly counteract the negative effect of increasing drought intensity on Brassica napus performance”
The same questions in other papers
co2 · physiology: water · Brassica napus (oilseed rape)Positive and negative results
1 reporting no difference from an alternative
- positive
co2 · physiology: photosynthesis · Brassica napus (oilseed rape)Results agree
4 papers in the same direction as this paper
- positive
- positive
- positive
1 paper more in this group
See all 5 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.