Abstract
The impact of sequential exposure to ozone (O3) and UVB (290-320 nm) was studied using two genotypes of Arabidopsis thaliana differing in UVB sensitivity. The negative impact of UVB on dry matter production and photosynthetic pigments was absent in the ecotype Landsberg erecta (LER), while the negative impact of UVB was more pronounced when LER plants pre-exposed to O3 were irradiated with UVB. However, the growth of tt5 plants (a mutant virtually incapable of synthesizing flavonoids) was significantly affected by the UVB exposures, while the impact of UVB was significantly counteracted when tt5 plants pre-exposed to O3 were irradiated with UVB. These results suggest that pre-exposure to O3 decreased sensitivity of tt5 but increased sensitivity of LER to UVB. Concentrations of UV-absorptive compounds were almost the same in plants exposed to UVB alone or sequentially to O3 and UVB. Exposures of LER and tt5 to UVB enhanced both ascorbic acid and glutathione as well as their redox state compared to control plants. Pre-exposure to O3 enhanced the total ascorbic acid and glutathione as well as the redox state of ascorbate and glutathione in tt5 but decreased the redox state in LER. Irradiation of plants pre-exposed to O3 with UVB enhanced the redox state of ascorbate and glutathione slightly in tt5 but decreased it further in LER. The high redox state of ascorbate and glutathione in tt5 pre-exposed to O3 would have protected plants from UVB and decreased their sensitivity to UVB in spite of their inability to synthesize flavonoids.(ABSTRACT TRUNCATED AT 250 WORDS)
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Claims 10
Claim · model-written summary
UVB did not reduce dry matter or photosynthetic pigments in LER.
- Taxon
- Arabidopsis
Arabidopsist0 - Material
- Landsberg erectae0
- Treatment
- UVBe0
- Outcome
- dry matter production and photosynthetic pigmentse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The negative impact of UVB on dry matter production and photosynthetic pigments was absent in the ecotype Landsberg erecta (LER)”
t0“Arabidopsis”
Claim · model-written summary
Ozone pre-exposure increased the adverse effect of UVB in LER.
- Taxon
- ArabidopsisArabidopsist0
- Material
- LERe0
- Treatment
- pre-exposed to O3e0
- Outcome
- negative impact of UVBe0
- Direction
- more pronouncede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the negative impact of UVB was more pronounced when LER plants pre-exposed to O3 were irradiated with UVB.”
t0“Arabidopsis”
Claim · model-written summary
UVB significantly affected tt5 growth.
- Taxon
- ArabidopsisArabidopsist0
- Material
- tt5e0
- Treatment
- UVB exposurese0
- Outcome
- growthe0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the growth of tt5 plants (a mutant virtually incapable of synthesizing flavonoids) was significantly affected by the UVB exposures”
t0“Arabidopsis”
Claim · model-written summary
Ozone pre-exposure counteracted UVB effects on tt5 growth.
- Taxon
- ArabidopsisArabidopsist0
- Material
- tt5e0
- Treatment
- pre-exposed to O3e0
- Outcome
- impact of UVBe0
- Direction
- counteractede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the impact of UVB was significantly counteracted when tt5 plants pre-exposed to O3 were irradiated with UVB.”
t0“Arabidopsis”
Claim · model-written summary
UV-absorptive compound concentrations were similar under UVB alone and sequential ozone and UVB.
- Taxon
- ArabidopsisArabidopsist0
- Treatment
- sequentially to O3 and UVBe0
- Outcome
- Concentrations of UV-absorptive compoundse0
- Direction
- almost the samee0
- Comparator
- UVB alonee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Concentrations of UV-absorptive compounds were almost the same in plants exposed to UVB alone or sequentially to O3 and UVB.”
t0“Arabidopsis”
Claim · model-written summary
UVB raised ascorbic acid, glutathione and their redox state in both genotypes.
- Taxon
- ArabidopsisArabidopsist0
- Treatment
- UVBe0
- Outcome
- ascorbic acid and glutathione as well as their redox statee0
- Direction
- enhancede0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exposures of LER and tt5 to UVB enhanced both ascorbic acid and glutathione as well as their redox state compared to control plants.”
t0“Arabidopsis”
Claim · model-written summary
Ozone pre-exposure raised antioxidant totals and redox state in tt5.
- Taxon
- ArabidopsisArabidopsist0
- Material
- tt5e0
- Treatment
- Pre-exposure to O3e0
- Outcome
- total ascorbic acid and glutathione as well as the redox state of ascorbate and glutathionee0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pre-exposure to O3 enhanced the total ascorbic acid and glutathione as well as the redox state of ascorbate and glutathione in tt5”
t0“Arabidopsis”
Claim · model-written summary
Ozone pre-exposure lowered antioxidant redox state in LER.
- Taxon
- ArabidopsisArabidopsist0
- Material
- LERe0
- Treatment
- OZONE EXPOSUREt0
- Outcome
- redox statee0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreased the redox state in LER.”
t0“OZONE EXPOSURE DECREASES UVB SENSITIVITY IN A UVB‐SENSITIVE FLAVONOID MUTANT OF Arabidopsis”
Claim · model-written summary
UVB after ozone slightly increased redox state in tt5.
- Taxon
- ArabidopsisArabidopsist0
- Material
- tt5e0
- Treatment
- Irradiation of plants pre-exposed to O3 with UVBe0
- Outcome
- redox state of ascorbate and glutathionee0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Irradiation of plants pre-exposed to O3 with UVB enhanced the redox state of ascorbate and glutathione slightly in tt5”
t0“Arabidopsis”
Claim · model-written summary
UVB after ozone further decreased redox state in LER.
- Taxon
- ArabidopsisArabidopsist0
- Material
- LERe0
- Treatment
- OZONE EXPOSUREt0
- Outcome
- decreased it furthere0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreased it further in LER.”
t0“OZONE EXPOSURE DECREASES UVB SENSITIVITY IN A UVB‐SENSITIVE FLAVONOID MUTANT OF Arabidopsis”
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See all 11 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.