Abstract
This study was done to evaluate the effects of increasing concentrations of CO2 (CC) on rapeseed. Pot experiments were done with three cultivars (Okapi, Zarfam and RGS003) of rapeseed (Brassica napus) for salinity tolerance. Four levels of salinity (0, 5, 10 and 15 dS m−1) were tested on the three cultivars at three CC (350, 700 and 1050 mmol L−1) at the greenhouse of Tarbiat Modares University, Iran, during the crop seasons of 2010 to 2011. Three CCs were considered as three environments and the other two treatments (salinity and cultivar) were tested within these environments in a complete block design arranged as a factorial. Results indicated that photosynthetic rates declined with increasing levels of salinity. Elevated CC significantly increased rates of photosynthesis. The highest CC reduced the impact of salinity on photosynthesis. Increased CC reduced the rate of transpiration, which had the effects of increasing rates of photosynthesis and water use efficiency (WUE); these effects increased vegetative growth and reduced the adverse effects of salinity. Increased CC and salinity reduced harvest index. WUE increased with CC increment, and decreased with salinity elevation.
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Claims 11
Claim · model-written summary
Photosynthetic rates declined as salinity increased.
- Taxon
- rapeseed (Brassica napus)
_Brassica_napus_-_Habit.jpg?width=60)
Brassica napust0 - Treatment
- salinitye0
- Outcome
- photosynthetic ratese0
- Direction
- declinede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Brassica_napus_-_Habit.jpg?width=500)
Verbatim
e0“photosynthetic rates declined with increasing levels of salinity”
t0“rapeseed (Brassica napus)”
Claim · model-written summary
Elevated CO2 significantly increased photosynthetic rates.
- Taxon
- rapeseed (Brassica napus)Brassica napust0
- Treatment
- Elevated CCe0
- Outcome
- rates of photosynthesise0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Elevated CC significantly increased rates of photosynthesis”
t0“rapeseed (Brassica napus)”
Claim · model-written summary
The highest CO2 concentration reduced the effect of salinity on photosynthesis.
- Taxon
- rapeseed (Brassica napus)Brassica napust0
- Treatment
- highest CCe0
- Outcome
- impact of salinity on photosynthesise0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest CC reduced the impact of salinity on photosynthesis”
t0“rapeseed (Brassica napus)”
Claim · model-written summary
Increased CO2 reduced transpiration rate.
- Taxon
- rapeseed (Brassica napus)Brassica napust0
- Treatment
- Increased CCe0
- Outcome
- rate of transpiratione0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increased CC reduced the rate of transpiration”
t0“rapeseed (Brassica napus)”
Claim · model-written summary
Increased CO2 increased photosynthesis and water-use efficiency through reduced transpiration.
- Taxon
- rapeseed (Brassica napus)Brassica napust0
- Treatment
- Increased CCe1
- Outcome
- rates of photosynthesis and water use efficiency (WUE)e0
- Direction
- increasinge0
- Qualifier
- rate of transpiratione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“which had the effects of increasing rates of photosynthesis and water use efficiency (WUE)”
e1“Increased CC reduced the rate of transpiration”
t0“rapeseed (Brassica napus)”
Claim · model-written summary
The increased photosynthesis and water-use efficiency promoted vegetative growth.
- Taxon
- rapeseed (Brassica napus)Brassica napust0
- Outcome
- vegetative growthe0
- Direction
- increasede0
- Qualifier
- rates of photosynthesis and water use efficiency (WUE)e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“these effects increased vegetative growth”
e1“increasing rates of photosynthesis and water use efficiency (WUE)”
t0“rapeseed (Brassica napus)”
Claim · model-written summary
The increased photosynthesis and water-use efficiency reduced adverse salinity effects.
- Taxon
- rapeseed (Brassica napus)Brassica napust0
- Outcome
- adverse effects of salinitye0
- Direction
- reducede0
- Qualifier
- rates of photosynthesis and water use efficiency (WUE)e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reduced the adverse effects of salinity”
e1“increasing rates of photosynthesis and water use efficiency (WUE)”
t0“rapeseed (Brassica napus)”
Claim · model-written summary
Increased CO2 reduced harvest index.
- Taxon
- rapeseed (Brassica napus)Brassica napust0
- Treatment
- Increased CCe0
- Outcome
- harvest indexe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increased CC and salinity reduced harvest index”
t0“rapeseed (Brassica napus)”
Claim · model-written summary
Increased salinity reduced harvest index.
- Taxon
- rapeseed (Brassica napus)Brassica napust0
- Treatment
- salinitye0
- Outcome
- harvest indexe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increased CC and salinity reduced harvest index”
t0“rapeseed (Brassica napus)”
Claim · model-written summary
Water-use efficiency increased with CO2 concentration.
- Taxon
- rapeseed (Brassica napus)Brassica napust0
- Treatment
- CC incremente0
- Outcome
- WUEe0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“WUE increased with CC increment”
t0“rapeseed (Brassica napus)”
Claim · model-written summary
Water-use efficiency decreased with increasing salinity.
- Taxon
- rapeseed (Brassica napus)Brassica napust0
- Treatment
- salinity elevatione0
- Outcome
- WUEe0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“WUE increased with CC increment, and decreased with salinity elevation”
t0“rapeseed (Brassica napus)”
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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.