Abstract
Depletion of stratospheric ozone is projected to cause increased UV-B radiation at the earth's surface. Some research suggests that increased UV-B radiation may be detrimental to crop growth. Current levels of ozone in the troposphere are known to suppress plant growth. Since these two stresses occur concurrently, field experiments were performed to determine their separate and combined effects on growth and physiological responses of soybean. Ozone treatments were controlled with open-top chambers, and UV-B treatments were administered with filtered lamps. Ozone (0.06 ppm mean 12-hr per day concentration during the 6 wk growth period) significantly suppressed biomass of leaves, stems, and roots throughout vegetative and early reproductive growth compared to controls receiving 0.025 ppm ozone. While plant biomass was often slightly less in elevated UV-B treatments (treatments approximating 25 to 28% depletion of stratospheric ozone), results usually were not significant. Significant interactions of ozone and UV-B usually reflected less than additive response of biomass to the two stresses in combination. Glutathione content and glutathione reductase activity were reduced by UV-B but increased by ozone. Ascorbate and UV-B absorbing pigments were increased by UV-B and unaffected by ozone. No consistent interactions of ozone and UV-B on these components were found.
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Claims 10
Claim · model-written summary
Ozone at 0.06 ppm significantly suppressed leaf, stem and root biomass versus 0.025 ppm.
- Taxon
- soybean
Glycine maxt0 - Treatment
- Ozone (0.06 ppm mean 12-hr per day concentration during the 6 wk growth period)e0
- Outcome
- biomass of leaves, stems, and rootse0
- Direction
- suppressede0
- Comparator
- controls receiving 0.025 ppm ozonee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean”
e0“Ozone (0.06 ppm mean 12-hr per day concentration during the 6 wk growth period) significantly suppressed biomass of leaves, stems, and roots throughout vegetative and early reproductive growth compared to controls receiving 0.025 ppm ozone.”
Claim · model-written summary
Elevated UV-B often slightly lowered biomass, usually without statistical significance.
- Taxon
- soybeanGlycine maxt0
- Treatment
- elevated UV-B treatmentse0
- Outcome
- plant biomasse0
- Direction
- slightly lesse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean”
e0“plant biomass was often slightly less in elevated UV-B treatments (treatments approximating 25 to 28% depletion of stratospheric ozone), results usually were not significant.”
Claim · model-written summary
Combined ozone and UV-B had a significant less than additive biomass interaction.
- Taxon
- soybeanGlycine maxt0
- Treatment
- ozone and UV-Be0
- Outcome
- response of biomasse0
- Direction
- less than additivee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean”
e0“Significant interactions of ozone and UV-B usually reflected less than additive response of biomass to the two stresses in combination.”
Claim · model-written summary
Glutathione content was reduced by UV-B.
- Taxon
- soybeanGlycine maxt0
- Treatment
- UV-Be0
- Outcome
- Glutathione contente0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean”
e0“Glutathione content and glutathione reductase activity were reduced by UV-B but increased by ozone.”
Claim · model-written summary
Glutathione content was increased by ozone.
- Taxon
- soybeanGlycine maxt0
- Treatment
- ozonee0
- Outcome
- Glutathione contente0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean”
e0“Glutathione content and glutathione reductase activity were reduced by UV-B but increased by ozone.”
Claim · model-written summary
glutathione reductase activity was reduced by UV-B.
- Taxon
- soybeanGlycine maxt0
- Treatment
- UV-Be0
- Outcome
- glutathione reductase activitye0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean”
e0“Glutathione content and glutathione reductase activity were reduced by UV-B but increased by ozone.”
Claim · model-written summary
glutathione reductase activity was increased by ozone.
- Taxon
- soybeanGlycine maxt0
- Treatment
- ozonee0
- Outcome
- glutathione reductase activitye0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean”
e0“Glutathione content and glutathione reductase activity were reduced by UV-B but increased by ozone.”
Claim · model-written summary
UV-B increased ascorbate and UV-B absorbing pigments.
- Taxon
- soybeanGlycine maxt0
- Treatment
- UV-Be0
- Outcome
- Ascorbate and UV-B absorbing pigmentse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean”
e0“Ascorbate and UV-B absorbing pigments were increased by UV-B and unaffected by ozone.”
Claim · model-written summary
Ozone left ascorbate and UV-B absorbing pigments unaffected.
- Taxon
- soybeanGlycine maxt0
- Treatment
- ozonee0
- Outcome
- Ascorbate and UV-B absorbing pigmentse0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean”
e0“Ascorbate and UV-B absorbing pigments were increased by UV-B and unaffected by ozone.”
Claim · model-written summary
No consistent ozone by UV-B interactions were found for these antioxidant components.
- Taxon
- soybeanGlycine maxt0
- Treatment
- ozone and UV-Be0
- Outcome
- these componentse0
- Direction
- No consistent interactionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean”
e0“No consistent interactions of ozone and UV-B on these components were found.”
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