Abstract
Field experiment was conducted to investigate the effects of nitrogen(N) supply on diurnal physiological characteristics in barley leaves at booting stage under enhanced UV-B radiation.The experiment was designed with two UV-B radiation levels,i.e.ambient(CK,1.5kJ·m-2·h-1) and enhanced by 20%(1.8kJ·m-2·h-1),and two N supply levels,i.e.30kg·ha-1(low) and 150kg·ha-1(high),and performed at the station of agricultural meteorology,Nanjing University of Information Science and Technology.The results showed that,enhanced UV-B radiation decreased net photosynthetic rate(Pn),transpiration rate(Tr),stomatal conductivity(Gs) and water use efficiency(WUE) by 44.6%,21.8%,17.8% and 28.4% under high N level,respectively,and reduced by 49.5%,11.8%,12.9% and 42.7% under low nitrogen level,respectively.The findings suggested that enhanced UV-B radiation depressed photosynthesis and water use efficiency in barley leaves,increasing N supply could alleviate the damage to net photosynthetic rate from enhanced UV-B radiation,but not to transpiration rate and stomatal conductivity.Based on the diurnal change of intercellular CO2 concentration in relation to net photosynthetic rate,it indicates that N supply and enhanced UV-B radiation impacted photosynthesis directly by the process of photosynthetic reaction,not by stomatal conductivity in barley leaves at booting stage.
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Claims 11
Claim · model-written summary
Enhanced UV-B lowered barley net photosynthetic rate by 44.6% at high nitrogen.
- Taxon
- Barley
.jpg?width=60)
Hordeum vulgaret0 - Treatment
- enhanced UV-B radiatione0
- Outcome
- net photosynthetic rate(Pn)e0
- Direction
- decreasede0
- Value
- 44.6%e0
- Qualifier
- high N levele0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“enhanced UV-B radiation decreased net photosynthetic rate(Pn),transpiration rate(Tr),stomatal conductivity(Gs) and water use efficiency(WUE) by 44.6%,21.8%,17.8% and 28.4% under high N level,respectively”
t0“Barley”
Claim · model-written summary
Enhanced UV-B lowered barley transpiration rate by 21.8% at high nitrogen.
- Taxon
- BarleyHordeum vulgaret0
- Treatment
- enhanced UV-B radiatione0
- Outcome
- transpiration rate(Tr)e0
- Direction
- decreasede0
- Value
- 21.8%e0
- Qualifier
- high N levele0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“enhanced UV-B radiation decreased net photosynthetic rate(Pn),transpiration rate(Tr),stomatal conductivity(Gs) and water use efficiency(WUE) by 44.6%,21.8%,17.8% and 28.4% under high N level,respectively”
t0“Barley”
Claim · model-written summary
Enhanced UV-B lowered barley stomatal conductivity by 17.8% at high nitrogen.
- Taxon
- BarleyHordeum vulgaret0
- Treatment
- enhanced UV-B radiatione0
- Outcome
- stomatal conductivity(Gs)e0
- Direction
- decreasede0
- Value
- 17.8%e0
- Qualifier
- high N levele0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“enhanced UV-B radiation decreased net photosynthetic rate(Pn),transpiration rate(Tr),stomatal conductivity(Gs) and water use efficiency(WUE) by 44.6%,21.8%,17.8% and 28.4% under high N level,respectively”
t0“Barley”
Claim · model-written summary
Enhanced UV-B lowered barley water-use efficiency by 28.4% at high nitrogen.
- Taxon
- BarleyHordeum vulgaret0
- Treatment
- enhanced UV-B radiatione0
- Outcome
- water use efficiency(WUE)e0
- Direction
- decreasede0
- Value
- 28.4%e0
- Qualifier
- high N levele0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“enhanced UV-B radiation decreased net photosynthetic rate(Pn),transpiration rate(Tr),stomatal conductivity(Gs) and water use efficiency(WUE) by 44.6%,21.8%,17.8% and 28.4% under high N level,respectively”
t0“Barley”
Claim · model-written summary
Enhanced UV-B lowered barley net photosynthetic rate by 49.5% at low nitrogen.
- Taxon
- BarleyHordeum vulgaret0
- Treatment
- enhanced UV-B radiatione1
- Outcome
- net photosynthetic rate(Pn)e1
- Direction
- reducede0
- Value
- 49.5%e0
- Qualifier
- low nitrogen levele0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reduced by 49.5%,11.8%,12.9% and 42.7% under low nitrogen level,respectively”
e1“enhanced UV-B radiation decreased net photosynthetic rate(Pn),transpiration rate(Tr),stomatal conductivity(Gs) and water use efficiency(WUE)”
t0“Barley”
Claim · model-written summary
Enhanced UV-B lowered barley transpiration rate by 11.8% at low nitrogen.
- Taxon
- BarleyHordeum vulgaret0
- Treatment
- enhanced UV-B radiatione1
- Outcome
- transpiration rate(Tr)e1
- Direction
- reducede0
- Value
- 11.8%e0
- Qualifier
- low nitrogen levele0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reduced by 49.5%,11.8%,12.9% and 42.7% under low nitrogen level,respectively”
e1“enhanced UV-B radiation decreased net photosynthetic rate(Pn),transpiration rate(Tr),stomatal conductivity(Gs) and water use efficiency(WUE)”
t0“Barley”
Claim · model-written summary
Enhanced UV-B lowered barley stomatal conductivity by 12.9% at low nitrogen.
- Taxon
- BarleyHordeum vulgaret0
- Treatment
- enhanced UV-B radiatione1
- Outcome
- stomatal conductivity(Gs)e1
- Direction
- reducede0
- Value
- 12.9%e0
- Qualifier
- low nitrogen levele0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reduced by 49.5%,11.8%,12.9% and 42.7% under low nitrogen level,respectively”
e1“enhanced UV-B radiation decreased net photosynthetic rate(Pn),transpiration rate(Tr),stomatal conductivity(Gs) and water use efficiency(WUE)”
t0“Barley”
Claim · model-written summary
Enhanced UV-B lowered barley water-use efficiency by 42.7% at low nitrogen.
- Taxon
- BarleyHordeum vulgaret0
- Treatment
- enhanced UV-B radiatione1
- Outcome
- water use efficiency(WUE)e1
- Direction
- reducede0
- Value
- 42.7%e0
- Qualifier
- low nitrogen levele0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reduced by 49.5%,11.8%,12.9% and 42.7% under low nitrogen level,respectively”
e1“enhanced UV-B radiation decreased net photosynthetic rate(Pn),transpiration rate(Tr),stomatal conductivity(Gs) and water use efficiency(WUE)”
t0“Barley”
Claim · model-written summary
Higher nitrogen supply alleviated the UV-B damage to barley net photosynthetic rate.
- Taxon
- BarleyHordeum vulgaret0
- Treatment
- increasing N supplye0
- Outcome
- damage to net photosynthetic ratee0
- Direction
- alleviatee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increasing N supply could alleviate the damage to net photosynthetic rate from enhanced UV-B radiation”
t0“Barley”
Claim · model-written summary
Higher nitrogen supply did not alleviate UV-B damage to barley transpiration rate and stomatal conductivity.
- Taxon
- BarleyHordeum vulgaret0
- Treatment
- increasing N supplye0
- Outcome
- transpiration rate and stomatal conductivitye0
- Direction
- note0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increasing N supply could alleviate the damage to net photosynthetic rate from enhanced UV-B radiation,but not to transpiration rate and stomatal conductivity”
t0“Barley”
Claim · model-written summary
The authors inferred that nitrogen and enhanced UV-B affected barley photosynthesis through photosynthetic reactions rather than stomatal conductivity.
- Taxon
- barleyHordeum vulgaree0
- Treatment
- N supply and enhanced UV-B radiatione0
- Outcome
- photosynthesise0
- Qualifier
- process of photosynthetic reaction,not by stomatal conductivitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N supply and enhanced UV-B radiation impacted photosynthesis directly by the process of photosynthetic reaction,not by stomatal conductivity in barley leaves at booting stage”
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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.