Abstract
There is limited information on the impacts of present‐day solar ultraviolet‐B radiation (UV‐B) on biomass and grain yield of field crops and on the mechanisms that confer tolerance to UV‐B radiation under field conditions. We investigated the effects of solar UV‐B on aspects of the biochemistry, growth and yield of barley crops using replicated field plots and two barley strains, a catalase (CAT)‐deficient mutant (RPr 79/4) and its wild‐type mother line (Maris Mink). Solar UV‐B reduced biomass accumulation and grain yield in both strains. The effects on crop biomass accumulation tended to be more severe in RPr 79/4 (≈ 32% reduction) than in the mother line (≈ 20% reduction). Solar UV‐B caused measurable DNA damage in leaf tissue, in spite of inducing a significant increase in UV‐absorbing sunscreens in the two lines. Maris Mink responded to solar UV‐B with increased CAT and ascorbate peroxidase (APx) activity. No effects of UV‐B on total superoxide dismutase (SOD) activity were detected. Compared with the wild type, RPr 79/4 had lower CAT activity, as expected, but higher APx activity. Neither of these activities increased in response to UV‐B in RPr 79/4. These results suggest that growth inhibition by solar UV‐B involves DNA damage and oxidative stress, and that constitutive and UV‐B‐induced antioxidant capacity may play an important role in UV‐B tolerance.
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Claims 13
Claim · model-written summary
Solar UV-B reduced biomass accumulation in both barley strains.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaree1 - Treatment
- Solar UV‐Be0
- Outcome
- biomass accumulatione0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Solar UV‐B reduced biomass accumulation and grain yield in both strains.”
e1“barley crops”
Claim · model-written summary
Solar UV-B reduced grain yield in both barley strains.
- Taxon
- barleyHordeum vulgaree1
- Treatment
- Solar UV‐Be0
- Outcome
- grain yielde0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Solar UV‐B reduced biomass accumulation and grain yield in both strains.”
e1“barley crops”
Claim · model-written summary
Biomass reduction under UV-B was approximately 32% in RPr 79/4.
- Taxon
- barleyHordeum vulgaree1
- Material
- RPr 79/4e0
- Treatment
- solar UV‐Be2
- Outcome
- crop biomass accumulatione0
- Direction
- reductione0
- Value
- ≈ 32% reductione0
- Comparator
- mother linee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effects on crop biomass accumulation tended to be more severe in RPr 79/4 (≈ 32% reduction) than in the mother line (≈ 20% reduction).”
e1“barley crops”
e2“We investigated the effects of solar UV‐B”
Claim · model-written summary
Biomass reduction under UV-B was approximately 20% in the mother line.
- Taxon
- barleyHordeum vulgaree1
- Material
- mother linee0
- Treatment
- solar UV‐Be2
- Outcome
- crop biomass accumulatione0
- Direction
- reductione0
- Value
- ≈ 20% reductione0
- Comparator
- RPr 79/4e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effects on crop biomass accumulation tended to be more severe in RPr 79/4 (≈ 32% reduction) than in the mother line (≈ 20% reduction).”
e1“barley crops”
e2“We investigated the effects of solar UV‐B”
Claim · model-written summary
Solar UV-B caused measurable leaf DNA damage.
- Taxon
- barleyHordeum vulgaree1
- Organ / stage
- leaf tissuee0
- Treatment
- Solar UV‐Be0
- Outcome
- DNA damagee0
- Direction
- causede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Solar UV‐B caused measurable DNA damage in leaf tissue”
e1“barley crops”
Claim · model-written summary
Solar UV-B significantly increased UV-absorbing sunscreens in both barley lines.
- Taxon
- barleyHordeum vulgaree1
- Treatment
- Solar UV‐Be2
- Outcome
- UV‐absorbing sunscreense0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“inducing a significant increase in UV‐absorbing sunscreens in the two lines”
e1“barley crops”
e2“Solar UV‐B caused measurable DNA damage”
Claim · model-written summary
Maris Mink increased CAT activity in response to solar UV-B.
- Taxon
- barleyHordeum vulgaree1
- Material
- Maris Minke0
- Treatment
- solar UV‐Be0
- Gene
- CATe0
- Outcome
- CATe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maris Mink responded to solar UV‐B with increased CAT and ascorbate peroxidase (APx) activity.”
e1“barley crops”
Claim · model-written summary
Maris Mink increased APx activity under solar UV-B.
- Taxon
- barleyHordeum vulgaree1
- Material
- Maris Minke0
- Treatment
- solar UV‐Be0
- Gene
- ascorbate peroxidase (APx)e0
- Outcome
- ascorbate peroxidase (APx) activitye0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maris Mink responded to solar UV‐B with increased CAT and ascorbate peroxidase (APx) activity.”
e1“barley crops”
Claim · model-written summary
UV-B did not measurably affect total SOD activity.
- Taxon
- barleyHordeum vulgaree1
- Treatment
- UV‐Be0
- Gene
- superoxide dismutase (SOD)e0
- Outcome
- total superoxide dismutase (SOD) activitye0
- Direction
- No effectse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No effects of UV‐B on total superoxide dismutase (SOD) activity were detected.”
e1“barley crops”
Claim · model-written summary
RPr 79/4 had lower CAT activity than wild type.
- Taxon
- barleyHordeum vulgaree1
- Material
- RPr 79/4e0
- Gene
- CATe0
- Outcome
- CAT activitye0
- Direction
- lowere0
- Comparator
- wild typee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with the wild type, RPr 79/4 had lower CAT activity”
e1“barley crops”
Claim · model-written summary
RPr 79/4 had higher APx activity than wild type.
- Taxon
- barleyHordeum vulgaree1
- Material
- RPr 79/4e0
- Gene
- APxe0
- Outcome
- APx activitye0
- Direction
- highere0
- Comparator
- wild typee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with the wild type, RPr 79/4 had lower CAT activity, as expected, but higher APx activity.”
e1“barley crops”
Claim · model-written summary
Neither CAT nor APx activity increased under UV-B in RPr 79/4.
- Taxon
- barleyHordeum vulgaree2
- Material
- RPr 79/4e0
- Treatment
- UV‐Be0
- Outcome
- CAT activity, as expected, but higher APx activitye1
- Direction
- Neither of these activities increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Neither of these activities increased in response to UV‐B in RPr 79/4.”
e1“lower CAT activity, as expected, but higher APx activity”
e2“barley crops”
Claim · model-written summary
The authors suggest DNA damage and oxidative stress contribute to UV-B growth inhibition.
- Taxon
- barleyHordeum vulgaree1
- Outcome
- growth inhibitione0
- Qualifier
- DNA damage and oxidative stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“growth inhibition by solar UV‐B involves DNA damage and oxidative stress”
e1“barley crops”
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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.