Abstract
Plants absorb light energy for photosynthesis, and some amount of potentially damaging range of solar radiation, ultraviolet B. It accounts for less than 0.5% of the total solar radiation and the ambient current level of UV-B during the growth season provide 10 kJ·m–2 energy per day on the Earth’s surface. In the field conditions, increased UV-B radiation is often accompanied by drought, but negative effect of combined stresses is not so deleterious as the effect of one of them alone. We studied some changes in nitrogen me deficit and UV-B radiation. The stresses generally decreased the biomass and total dry matter production. Combination of water deficit and UV-B activated a stress tolerance mechanism in cucumber seedlings. The NR activity and synthesis of UV-B absorbing compounds were induced. Protection against UV-B radiation can partially involve increased production of UV-B protective pigments – slightly increased the SPAD value in cucumber cotyledons and leaves was observed. The deleterious effect of combined stresses was weaker than their additive or individual effects.
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Claims 5
Claim · model-written summary
Drought stress combined with excessive UV-B radiation decreased biomass and total dry matter production in cucumber.
- Taxon
- CUCUMBER
Cucumis sativust0 - Organ / stage
- cotyledons and leavese7
- Treatment
- drought stress and excessive UV-B radiationt0
- Outcome
- biomass and total dry matter productione4
- Direction
- decreasede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“NITROGEN METABOLISM IN CUCUMBER COTYLEONS AND LEAVES EXPOSED TO THE DROUGHT STRESS AND EXCESSIVE UV-B RADIATION”
e4“The stresses generally decreased the biomass and total dry matter production”
e7“slightly increased the SPAD value in cucumber cotyledons and leaves was observed”
Claim · model-written summary
Combined drought and UV-B induced NR activity and the synthesis of UV-B absorbing compounds in cucumber.
- Taxon
- CUCUMBERCucumis sativust0
- Treatment
- drought stress and excessive UV-B radiationt0
- Gene
- NRe6
- Outcome
- NR activity and synthesis of UV-B absorbing compoundse6
- Direction
- inducede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“NITROGEN METABOLISM IN CUCUMBER COTYLEONS AND LEAVES EXPOSED TO THE DROUGHT STRESS AND EXCESSIVE UV-B RADIATION”
e6“The NR activity and synthesis of UV-B absorbing compounds were induced”
Claim · model-written summary
SPAD value slightly increased in cucumber cotyledons and leaves under the combined stress.
- Taxon
- cucumberCucumis sativuse7
- Organ / stage
- cotyledons and leavese7
- Treatment
- drought stress and excessive UV-B radiationt0
- Outcome
- SPAD valuee7
- Direction
- increasede7
- Qualifier
- slightlye7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“NITROGEN METABOLISM IN CUCUMBER COTYLEONS AND LEAVES EXPOSED TO THE DROUGHT STRESS AND EXCESSIVE UV-B RADIATION”
e7“slightly increased the SPAD value in cucumber cotyledons and leaves was observed”
Claim · model-written summary
Combined water deficit and UV-B activated a stress tolerance mechanism in cucumber seedlings.
- Taxon
- cucumberCucumis sativuse5
- Organ / stage
- seedlingse5
- Treatment
- Combination of water deficit and UV-Be5
- Outcome
- stress tolerance mechanisme5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“Combination of water deficit and UV-B activated a stress tolerance mechanism in cucumber seedlings”
Claim · model-written summary
The deleterious effect of combined drought and UV-B was weaker than their additive or individual effects in cucumber.
- Taxon
- CUCUMBERCucumis sativust0
- Treatment
- combined stressese1
- Outcome
- deleterious effecte1
- Direction
- weakere1
- Comparator
- their additive or individual effectse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“NITROGEN METABOLISM IN CUCUMBER COTYLEONS AND LEAVES EXPOSED TO THE DROUGHT STRESS AND EXCESSIVE UV-B RADIATION”
e1“The deleterious effect of combined stresses was weaker than their additive or individual effects”
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