Abstract
The effect of UV-B radiation on FW, leaf and stem length, photosynthetic O2 evolution, levels of carbohydrates and nitrates, and extractable activities of some of the enzymes involved in C and N metabolism was evaluated in barley (Hordeum vulgare L. cv. Express) seedlings during the 9 days following transfer to an UV-B enriched environment. The results show that under our experimental conditions UV-B radiation scarcely affects the photosynthetic competence of barley leaves, expressed as RuBP carboxylase (EC 4.1.1.39) activity, O2 evolution rate and chlorophyll content. Nevertheless, this treatment induced significant alterations of the enzyme activity of nitrate reductase (EC 1.6.6.1) and glutamine synthetase (EC 6.3.1.2), although only after a few days of treatment. The effects were not confined to the exposed tissue, but were detectable also at the root level. In fact, nitrate reductase decreased in response to UV-B in both leaf and root tissue, whereas glutamine synthetase was affected only in the root. In contrast, nitrate content was not influenced by the treatment, neither in root nor in leaf tissue, whilst leaf sucrose diminished in exposed plants only on the last day of treatment.
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Claims 7
Claim · model-written summary
UV-B scarcely affected photosynthetic competence indicators in barley leaves.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaree0 - Treatment
- UV-B radiatione0
- Outcome
- RuBP carboxylase (EC 4.1.1.39) activity, O2 evolution rate and chlorophyll contente0
- Direction
- scarcely affectse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“UV-B radiation scarcely affects the photosynthetic competence of barley leaves, expressed as RuBP carboxylase (EC 4.1.1.39) activity, O2 evolution rate and chlorophyll content.”
Claim · model-written summary
UV-B significantly altered nitrate reductase activity after several days.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- this treatmente0
- Gene
- nitrate reductase (EC 1.6.6.1)e0
- Outcome
- enzyme activity of nitrate reductase (EC 1.6.6.1)e0
- Qualifier
- only after a few days of treatmente0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this treatment induced significant alterations of the enzyme activity of nitrate reductase (EC 1.6.6.1) and glutamine synthetase (EC 6.3.1.2), although only after a few days of treatment.”
t0“barley plants”
Claim · model-written summary
UV-B significantly altered glutamine synthetase activity after several days.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- this treatmente0
- Gene
- glutamine synthetase (EC 6.3.1.2)e0
- Outcome
- glutamine synthetase (EC 6.3.1.2)e0
- Qualifier
- only after a few days of treatmente0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this treatment induced significant alterations of the enzyme activity of nitrate reductase (EC 1.6.6.1) and glutamine synthetase (EC 6.3.1.2), although only after a few days of treatment.”
t0“barley plants”
Claim · model-written summary
UV-B reduced nitrate reductase in barley leaves and roots.
- Taxon
- barleyHordeum vulgaret0
- Organ / stage
- leaf and root tissuee0
- Treatment
- UV-Be0
- Outcome
- nitrate reductasee0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nitrate reductase decreased in response to UV-B in both leaf and root tissue”
t0“barley plants”
Claim · model-written summary
Glutamine synthetase response was limited to barley roots.
- Taxon
- barleyHordeum vulgaret0
- Organ / stage
- roote0
- Outcome
- glutamine synthetasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“glutamine synthetase was affected only in the root.”
t0“barley plants”
Claim · model-written summary
UV-B did not influence nitrate content in barley roots or leaves.
- Taxon
- barleyHordeum vulgaret0
- Organ / stage
- root nor in leaf tissuee0
- Treatment
- treatmente0
- Outcome
- nitrate contente0
- Direction
- not influencede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nitrate content was not influenced by the treatment, neither in root nor in leaf tissue”
t0“barley plants”
Claim · model-written summary
Leaf sucrose declined only on the last treatment day.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- exposed plantse0
- Outcome
- leaf sucrosee0
- Direction
- diminishede0
- Qualifier
- only on the last day of treatmente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“leaf sucrose diminished in exposed plants only on the last day of treatment.”
t0“barley plants”
The same questions in other papers
uv · physiology: pigments · Hordeum vulgare (barley)Results differ
4 papers in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- negative
3 papers more in this group
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.