Abstract
As thinning of atmospheric ozone layer,intensities of ultraviolet-B(UV-B) radiation on the surface increasing,these have impacted widely to creature and crops.To approach the impacts of the physiology and ecosystem of crops in the arid and semiarid region,experiments were carried out in Yongning county of Ningxia in 2004,which were about the impacts of enhanced UV-B on diurnal variations of photosynthesis in corn.In the experiments,3 treatment groups(the control group,R1 dose0.5 W/m2 UV-B,R2 dose 0.5 W/m2 UV-B) were set up.From trefoil stage of corn,corn was exposed for 8 hours everyday from 9: 00 to 17: 00.Using a portable CIRAS I photosynthetic analysis system,the diurnal variations of photosynthetic rate,transpiration rate,stoma conductivity of corn leaf were recorded at 7: 00-20: 00 on the 19th of May,and water use efficiency(WUE) was computed.Results showed that,compared to the control group the photosynthetic rate,transpiration rate,stoma conductivity and water use efficiency reduced by 57.1%,15.6%,11.0% and 49.3%,respectively,in plants subjected to R1 dose UV-B radiation(0.5 W/m2) and by 67.5%,18.8%,24.8% and 60.6% in plants subjected to R2 dose UV-B radiation(1.0 W/m2),enhanced UV-B has impacted clearly to the corn in the arid and semiarid region.Photosynthesis and WUE of corn leaf reduced with enhanced UV-B radiation.Enhanced UV-B would reduce corn output and increase water resources.In the background of the global warming and surface UV-B enhanced,cultivation and renew of crop variety and amplification of adaptability and resistivity to environmental condition are important measures to sustain development of agriculture and socioeconomy.
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Claims 11
Claim · model-written summary
R1 UV-B reduced photosynthetic rate by 57.1% versus control.
- Taxon
- corn
Zea mays subsp. mayst0 - Treatment
- R1 dose UV-B radiation(0.5 W/m2)e0
- Outcome
- photosynthetic ratee0
- Direction
- reducede0
- Value
- 57.1%e0
- Comparator
- control groupe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“compared to the control group the photosynthetic rate,transpiration rate,stoma conductivity and water use efficiency reduced by 57.1%,15.6%,11.0% and 49.3%,respectively,in plants subjected to R1 dose UV-B radiation(0.5 W/m2)”
t0“corn”
Claim · model-written summary
R1 UV-B reduced transpiration rate by 15.6% versus control.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- R1 dose UV-B radiation(0.5 W/m2)e0
- Outcome
- transpiration ratee0
- Direction
- reducede0
- Value
- 15.6%e0
- Comparator
- control groupe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“compared to the control group the photosynthetic rate,transpiration rate,stoma conductivity and water use efficiency reduced by 57.1%,15.6%,11.0% and 49.3%,respectively,in plants subjected to R1 dose UV-B radiation(0.5 W/m2)”
t0“corn”
Claim · model-written summary
R1 UV-B reduced stomatal conductance by 11.0% versus control.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- R1 dose UV-B radiation(0.5 W/m2)e0
- Outcome
- stoma conductivitye0
- Direction
- reducede0
- Value
- 11.0%e0
- Comparator
- control groupe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“compared to the control group the photosynthetic rate,transpiration rate,stoma conductivity and water use efficiency reduced by 57.1%,15.6%,11.0% and 49.3%,respectively,in plants subjected to R1 dose UV-B radiation(0.5 W/m2)”
t0“corn”
Claim · model-written summary
R1 UV-B reduced water use efficiency by 49.3% versus control.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- R1 dose UV-B radiation(0.5 W/m2)e0
- Outcome
- water use efficiencye0
- Direction
- reducede0
- Value
- 49.3%e0
- Comparator
- control groupe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“compared to the control group the photosynthetic rate,transpiration rate,stoma conductivity and water use efficiency reduced by 57.1%,15.6%,11.0% and 49.3%,respectively,in plants subjected to R1 dose UV-B radiation(0.5 W/m2)”
t0“corn”
Claim · model-written summary
R2 UV-B reduced photosynthetic rate by 67.5% versus control.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- R2 dose UV-B radiation(1.0 W/m2)e0
- Value
- 67.5%e0
Not reportedComparatorOutcomeDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“and by 67.5%,18.8%,24.8% and 60.6% in plants subjected to R2 dose UV-B radiation(1.0 W/m2)”
t0“corn”
Claim · model-written summary
R2 UV-B reduced transpiration rate by 18.8% versus control.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- R2 dose UV-B radiation(1.0 W/m2)e0
- Value
- 18.8%e0
Not reportedComparatorOutcomeDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“and by 67.5%,18.8%,24.8% and 60.6% in plants subjected to R2 dose UV-B radiation(1.0 W/m2)”
t0“corn”
Claim · model-written summary
R2 UV-B reduced stomatal conductance by 24.8% versus control.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- R2 dose UV-B radiation(1.0 W/m2)e0
- Value
- 24.8%e0
Not reportedComparatorOutcomeDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“and by 67.5%,18.8%,24.8% and 60.6% in plants subjected to R2 dose UV-B radiation(1.0 W/m2)”
t0“corn”
Claim · model-written summary
R2 UV-B reduced water use efficiency by 60.6% versus control.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- R2 dose UV-B radiation(1.0 W/m2)e0
- Value
- 60.6%e0
Not reportedComparatorOutcomeDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“and by 67.5%,18.8%,24.8% and 60.6% in plants subjected to R2 dose UV-B radiation(1.0 W/m2)”
t0“corn”
Claim · model-written summary
Photosynthesis and water use efficiency declined with stronger UV-B.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- enhanced UV-B radiatione0
- Outcome
- Photosynthesis and WUEe0
- Direction
- reducede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Photosynthesis and WUE of corn leaf reduced with enhanced UV-B radiation”
Claim · model-written summary
Enhanced UV-B was predicted to reduce corn output.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- Enhanced UV-Be0
- Outcome
- corn outpute0
- Direction
- reducee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Enhanced UV-B would reduce corn output”
Claim · model-written summary
The authors recommend crop variety cultivation and renewal to support adaptation.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- cultivation and renew of crop variety and amplification of adaptability and resistivity to environmental conditione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cultivation and renew of crop variety and amplification of adaptability and resistivity to environmental condition are important measures to sustain development of agriculture and socioeconomy”
t0“corn”
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