Abstract
The stratospheric ozone layer formed a protective atmospheric filter against biologically harmful solar ultraviolet(UV)radiation.Anthropogenic emissions of chlorofluorocarbons and nitrogen oxides resulted in depletion of ozone layer.Consequently,enhanced levels of UV-B radiation(280～320 nm)had been detected in the Southern as well as in the Northern Hemisphere.Enhanced UV-B radiation had been confirmed to negatively affect plant growth and development in higher plants.Barley is the forth most important worldwide cereal crop,after wheat,maize and rice,but very few studies have been conducted concerning its response to elevated UV-B radiation.Field experiment with barley was conducted to investigate the changes of growth,development and yield under enhanced UV-B radiation.The experiment was designed with two levels of UV-B radiation i.e.contro(lCK,ambient)and enhanced UV-B(E,1.8 kJ·m-2),and conducted at the Agro-Meteorological Station,Nanjing University of Information Science and Technology,Jiangsu Province,China.The results showed that the decreases in plant height,green leaf number,total leaf area and biomass(root and shoot)were observed under enhanced UV-B radiation,but varied with growth stages.Furthermore,enhanced UV-B radiation also reduced chlorophyll content,net photosynthetic rate,stomatal conductivity,transpiration rate and water use efficiency.Finally,the seed yield was significantly reduced by 24.96% under enhanced UV-B radiation.
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Claims 5
Claim · model-written summary
Enhanced UV-B radiation decreased plant height, green leaf number and total leaf area of barley.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaret0 - Treatment
- enhanced UV-B radiatione1
- Outcome
- plant height, green leaf number, total leaf areae1
- Direction
- decreasese1
- Qualifier
- varied with growth stagese1
- Comparator
- ambiente2
- Setting
- Jiangsu Province,Chinae3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
t0“physiological and ecological parameters in barley”
e1“The results showed that the decreases in plant height, green leaf number, total leaf area and biomass(root and shoot) were observed under enhanced UV-B radiation,but varied with growth stages”
e2“contro(lCK,ambient)and enhanced UV-B(E,1.8 kJ·m-2)”
e3“conducted at the Agro-Meteorological Station,Nanjing University of Information Science and Technology,Jiangsu Province,China”
Claim · model-written summary
Enhanced UV-B radiation decreased root and shoot biomass of barley.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- enhanced UV-B radiatione1
- Outcome
- biomass(root and shoot)e1
- Direction
- decreasese1
- Qualifier
- varied with growth stagese1
- Comparator
- ambiente2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“physiological and ecological parameters in barley”
e1“The results showed that the decreases in plant height, green leaf number, total leaf area and biomass(root and shoot) were observed under enhanced UV-B radiation,but varied with growth stages”
e2“contro(lCK,ambient)and enhanced UV-B(E,1.8 kJ·m-2)”
Claim · model-written summary
Enhanced UV-B radiation reduced chlorophyll content, net photosynthetic rate and stomatal conductivity of barley.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- enhanced UV-B radiatione4
- Outcome
- chlorophyll content,net photosynthetic rate,stomatal conductivitye4
- Direction
- reducede4
- Comparator
- ambiente2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“physiological and ecological parameters in barley”
e2“contro(lCK,ambient)and enhanced UV-B(E,1.8 kJ·m-2)”
e4“enhanced UV-B radiation also reduced chlorophyll content,net photosynthetic rate,stomatal conductivity,transpiration rate and water use efficiency”
Claim · model-written summary
Enhanced UV-B radiation reduced transpiration rate and water use efficiency of barley.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- enhanced UV-B radiatione4
- Outcome
- transpiration rate and water use efficiencye4
- Direction
- reducede4
- Comparator
- ambiente2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“physiological and ecological parameters in barley”
e2“contro(lCK,ambient)and enhanced UV-B(E,1.8 kJ·m-2)”
e4“enhanced UV-B radiation also reduced chlorophyll content,net photosynthetic rate,stomatal conductivity,transpiration rate and water use efficiency”
Claim · model-written summary
Enhanced UV-B radiation significantly reduced barley seed yield by 24.96%.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- enhanced UV-B radiatione5
- Outcome
- seed yielde5
- Direction
- reducede5
- Value
- 24.96%e5
- Comparator
- ambiente2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“physiological and ecological parameters in barley”
e2“contro(lCK,ambient)and enhanced UV-B(E,1.8 kJ·m-2)”
e5“the seed yield was significantly reduced by 24.96% under enhanced UV-B radiation”
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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.