Abstract
Barley (Hordeum vulgare L. cv. Alfa) seedlings were treated for 4 d before UV-B irradiation with 0.05 mM proline or 150 mM NaCl. UV-B exposure induced synthesis of yellow coloured compounds with maximum absorbance at 438 nm. The content of these compounds was increased in proline-treated and decreased in NaCl-treated plants. UV-B radiation reduced chlorophyll/carotenoids ratio, oxygen evolution rate and photochemical efficiency of PS 2 as estimated by chlorophyll fluorescence and increased proline accumulation, H2O2 generation and lipid peroxidation. Exogenous proline had no effect on the parameters studied and did not change the response of plants to UV-B radiation. NaCl inhibited photochemical efficiency of PS 2, reduced oxygen evolution and increased H2O2 concentration and lipid peroxidation. The combination of NaCl and proline treatment led to lowering the inhibitory effect of NaCl in non UV-B irradiated seedlings. There was not relationship between the level of UV-B-induced compounds and UV-B tolerance of barley seedlings.
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Claims 10
Claim · model-written summary
UV-B induced yellow compound synthesis with maximum absorbance at 438 nm.
- Taxon
- Barley
.jpg?width=60)
Hordeum vulgaree1 - Treatment
- UV-B exposuree0
- Outcome
- synthesis of yellow coloured compoundse0
- Value
- 438 nme0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“UV-B exposure induced synthesis of yellow coloured compounds with maximum absorbance at 438 nm”
e1“Barley (Hordeum vulgare L. cv. Alfa)”
Claim · model-written summary
Proline increased UV-B-induced yellow compound content.
- Taxon
- BarleyHordeum vulgaree1
- Treatment
- proline-treatede0
- Outcome
- content of these compoundse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The content of these compounds was increased in proline-treated”
e1“Barley (Hordeum vulgare L. cv. Alfa)”
Claim · model-written summary
NaCl decreased UV-B-induced yellow compound content.
- Taxon
- BarleyHordeum vulgaree2
- Treatment
- NaCl-treatede0
- Outcome
- content of these compoundse1
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreased in NaCl-treated plants”
e1“The content of these compounds was increased in proline-treated and decreased in NaCl-treated plants”
e2“Barley (Hordeum vulgare L. cv. Alfa)”
Claim · model-written summary
UV-B reduced chlorophyll/carotenoids ratio, oxygen evolution, and PS2 photochemical efficiency.
- Taxon
- BarleyHordeum vulgaree1
- Treatment
- UV-B radiatione0
- Outcome
- chlorophyll/carotenoids ratio, oxygen evolution rate and photochemical efficiency of PS 2e0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“UV-B radiation reduced chlorophyll/carotenoids ratio, oxygen evolution rate and photochemical efficiency of PS 2”
e1“Barley (Hordeum vulgare L. cv. Alfa)”
Claim · model-written summary
UV-B increased proline accumulation, H2O2 generation, and lipid peroxidation.
- Taxon
- BarleyHordeum vulgaree2
- Treatment
- UV-B radiatione1
- Outcome
- proline accumulation, H2O2 generation and lipid peroxidatione0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased proline accumulation, H2O2 generation and lipid peroxidation”
e1“UV-B radiation reduced chlorophyll/carotenoids ratio, oxygen evolution rate and photochemical efficiency of PS 2 as estimated by chlorophyll fluorescence and increased proline accumulation, H2O2 generation and lipid peroxidation”
e2“Barley (Hordeum vulgare L. cv. Alfa)”
Claim · model-written summary
Exogenous proline did not affect measured parameters or modify UV-B response.
- Taxon
- BarleyHordeum vulgaree1
- Treatment
- Exogenous prolinee0
- Outcome
- parameters studied and did not change the response of plants to UV-B radiatione0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exogenous proline had no effect on the parameters studied and did not change the response of plants to UV-B radiation”
e1“Barley (Hordeum vulgare L. cv. Alfa)”
Claim · model-written summary
NaCl inhibited PS2 photochemical efficiency and reduced oxygen evolution.
- Taxon
- BarleyHordeum vulgaree1
- Treatment
- NaCle0
- Outcome
- photochemical efficiency of PS 2, reduced oxygen evolutione0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NaCl inhibited photochemical efficiency of PS 2, reduced oxygen evolution”
e1“Barley (Hordeum vulgare L. cv. Alfa)”
Claim · model-written summary
NaCl increased H2O2 concentration and lipid peroxidation.
- Taxon
- BarleyHordeum vulgaree1
- Treatment
- NaCle0
- Outcome
- H2O2 concentration and lipid peroxidatione0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NaCl inhibited photochemical efficiency of PS 2, reduced oxygen evolution and increased H2O2 concentration and lipid peroxidation”
e1“Barley (Hordeum vulgare L. cv. Alfa)”
Claim · model-written summary
Combined NaCl and proline lowered NaCl inhibition without UV-B.
- Taxon
- BarleyHordeum vulgaree1
- Treatment
- combination of NaCl and proline treatmente0
- Outcome
- inhibitory effect of NaCle0
- Direction
- loweringe0
- Qualifier
- non UV-B irradiated seedlingse0
- Comparator
- NaCle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The combination of NaCl and proline treatment led to lowering the inhibitory effect of NaCl in non UV-B irradiated seedlings”
e1“Barley (Hordeum vulgare L. cv. Alfa)”
Claim · model-written summary
UV-B-induced compound levels were unrelated to barley UV-B tolerance.
- Taxon
- barleyHordeum vulgaree0
- Compound
- UV-B-induced compoundse0
- Outcome
- UV-B tolerancee0
- Direction
- not relationshipe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was not relationship between the level of UV-B-induced compounds and UV-B tolerance of barley seedlings”
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