Abstract
7-d-old etiolated and green barley seedlings (Hordeum vulgare L. cv. Alfa) were irradiated with UV-B for 30 min and then kept for 24 h in light or darkness. Chlorophyll (Chl) synthesis was inhibited by about 30 % as a result of UV-B irradiation, but there were no significant changes in photochemical activity measured by variable to maximum fluorescence ratio (Fv/Fm), quantum yield (ΦPS2) and oxygen evolution rate. Electron transport of etiolated seedlings was similar to that of green ones, nevertheless, the Chl content was more then 2-fold lower. Ribulose-1,5-bisphosphate carboxylase/oxygenase large and small subunits were diminished as a result of UV-B irradiation in etiolated and green plants, especially in those kept in the darkness. Catalase activity decreased and total superoxide dismutase activity increased in green and etiolated plants following UV-B treatment. When benzidine was used as a substrate, an isoform located between guaiacol peroxidases 2 and 3 (guaiacol peroxidase X) appeared, which was specific for UV-B treatment. As a result of irradiation, the contents of UV-B absorbing and UV-B induced compounds increased in green seedlings but not in etiolated seedlings.
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Claims 9
Claim · model-written summary
UV-B inhibited chlorophyll synthesis by about 30%.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaree1 - Material
- cv. Alfae1
- Treatment
- UV-B irradiatione0
- Outcome
- Chlorophyll (Chl) synthesise0
- Direction
- inhibitede0
- Value
- about 30 %e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Chlorophyll (Chl) synthesis was inhibited by about 30 % as a result of UV-B irradiation”
e1“green barley seedlings (Hordeum vulgare L. cv. Alfa)”
Claim · model-written summary
Electron transport in etiolated seedlings was similar to green seedlings.
- Taxon
- barleyHordeum vulgaree1
- Organ / stage
- etiolated seedlingse0
- Outcome
- Electron transporte0
- Direction
- similare0
- Comparator
- green onese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Electron transport of etiolated seedlings was similar to that of green ones”
e1“green barley seedlings (Hordeum vulgare L. cv. Alfa)”
Claim · model-written summary
Etiolated seedlings had more than twofold lower chlorophyll content than green seedlings.
- Taxon
- barleyHordeum vulgaree2
- Organ / stage
- etiolated seedlingse1
- Outcome
- Chl contente0
- Direction
- lowere0
- Value
- more then 2-folde0
- Comparator
- green onese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the Chl content was more then 2-fold lower”
e1“Electron transport of etiolated seedlings was similar to that of green ones”
e2“green barley seedlings (Hordeum vulgare L. cv. Alfa)”
Claim · model-written summary
UV-B diminished both Rubisco subunits, especially in plants kept in darkness.
- Taxon
- barleyHordeum vulgaree1
- Treatment
- UV-B irradiatione0
- Gene
- Ribulose-1,5-bisphosphate carboxylase/oxygenasee0
- Outcome
- large and small subunitse0
- Direction
- diminishede0
- Qualifier
- especially in those kept in the darknesse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ribulose-1,5-bisphosphate carboxylase/oxygenase large and small subunits were diminished as a result of UV-B irradiation in etiolated and green plants, especially in those kept in the darkness”
e1“green barley seedlings (Hordeum vulgare L. cv. Alfa)”
Claim · model-written summary
UV-B reduced catalase activity in green and etiolated plants.
- Taxon
- barleyHordeum vulgaree1
- Treatment
- UV-B treatmente0
- Gene
- Catalasee0
- Outcome
- Catalase activitye0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Catalase activity decreased and total superoxide dismutase activity increased in green and etiolated plants following UV-B treatment”
e1“green barley seedlings (Hordeum vulgare L. cv. Alfa)”
Claim · model-written summary
UV-B increased total superoxide dismutase activity in green and etiolated plants.
- Taxon
- barleyHordeum vulgaree1
- Treatment
- UV-B treatmente0
- Gene
- superoxide dismutasee0
- Outcome
- total superoxide dismutase activitye0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Catalase activity decreased and total superoxide dismutase activity increased in green and etiolated plants following UV-B treatment”
e1“green barley seedlings (Hordeum vulgare L. cv. Alfa)”
Claim · model-written summary
A guaiacol peroxidase isoform appeared specifically after UV-B treatment when benzidine was the substrate.
- Taxon
- barleyHordeum vulgaree1
- Treatment
- UV-B treatmente0
- Gene
- guaiacol peroxidase Xe0
- Outcome
- guaiacol peroxidase X) appearede0
- Qualifier
- When benzidine was used as a substratee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When benzidine was used as a substrate, an isoform located between guaiacol peroxidases 2 and 3 (guaiacol peroxidase X) appeared, which was specific for UV-B treatment”
e1“green barley seedlings (Hordeum vulgare L. cv. Alfa)”
Claim · model-written summary
UV-B increased UV-B absorbing and induced compounds in green seedlings.
- Taxon
- barleyHordeum vulgaree1
- Organ / stage
- green seedlingse0
- Treatment
- irradiatione2
- Outcome
- contents of UV-B absorbing and UV-B induced compoundse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the contents of UV-B absorbing and UV-B induced compounds increased in green seedlings but not in etiolated seedlings”
e1“green barley seedlings (Hordeum vulgare L. cv. Alfa)”
e2“As a result of irradiation”
Claim · model-written summary
UV-B did not increase those compounds in etiolated seedlings.
- Taxon
- barleyHordeum vulgaree1
- Organ / stage
- etiolated seedlingse0
- Treatment
- irradiatione2
- Outcome
- contents of UV-B absorbing and UV-B induced compoundse0
- Direction
- note0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the contents of UV-B absorbing and UV-B induced compounds increased in green seedlings but not in etiolated seedlings”
e1“green barley seedlings (Hordeum vulgare L. cv. Alfa)”
e2“As a result of irradiation”
The same questions in other papers
uv · physiology: pigments · Hordeum vulgare (barley)Results differ
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- positive
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4 papers in the same direction as this paper · 2 in the opposite direction
- negative
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See all 7 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.