Abstract
The effects of UV-B radiation on the seedling growth, carbohydrate metabolism and antioxidants activities of rice (Oryza sativa L.) were investigated under environmentally controlled chamber. Supplementary UVB radiation reduced dry matter as well as leaf area, therefore, relative growth rates (RGR) of seedlings were decreased by up to half compared to control. Photosynthetic products such as soluble sugars and starch were rapidly and significantly reduced by within 1 day of enhanced UV-B radiation due to the inhibition and degradation of photosynthetic processes and thylakoid membrane integrity. In our study, nonstructural carbohydrate levels were proved to be a main indicator on UV-Binduced stress. The behavior of SOD, CAT, APX and POD activities was monitored in the leaves of rice seedlings subjected to UV-B radiation. Under UV-B treatments, SOD activity was initially increased, whereas CAT and POD activities were slowly and slightly increased. However, APX activity showed no presumable results with an increase of UV-B dose. In leaves of rice seedlings, supplementary UV-B radiation caused an increase in free putrescine and spermidine, however spermine remained unaltered, although 24-hrs UV-B treatment slightly increased. This result presumes that an excess UV-B dose may induce ethylene biosynthesis (senescence) rather than polyamine biosynthesis (defense).
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Claims 13
Claim · model-written summary
Supplementary UV-B reduced rice seedling dry matter.
- Taxon
- rice (Oryza sativa L.)
Oryza sativae1 - Treatment
- UV-Bt0
- Outcome
- dry mattere0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Supplementary UVB radiation reduced dry matter as well as leaf area”
t0“UV-B-Induced Changes in Carbohydrate Content and Antioxidant Activity in Rice Seedling”
e1“rice (Oryza sativa L.)”
Claim · model-written summary
Supplementary UV-B reduced rice seedling leaf area.
- Taxon
- rice (Oryza sativa L.)Oryza sativae1
- Treatment
- UV-Bt0
- Outcome
- leaf areae0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Supplementary UVB radiation reduced dry matter as well as leaf area”
t0“UV-B-Induced Changes in Carbohydrate Content and Antioxidant Activity in Rice Seedling”
e1“rice (Oryza sativa L.)”
Claim · model-written summary
UV-B decreased rice seedling relative growth rates by up to half versus control.
- Taxon
- rice (Oryza sativa L.)Oryza sativae1
- Treatment
- UV-Bt0
- Outcome
- relative growth rates (RGR)e0
- Direction
- decreasede0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“relative growth rates (RGR) of seedlings were decreased by up to half compared to control”
t0“UV-B-Induced Changes in Carbohydrate Content and Antioxidant Activity in Rice Seedling”
e1“rice (Oryza sativa L.)”
Claim · model-written summary
Enhanced UV-B rapidly and significantly reduced rice soluble sugars within one day.
- Taxon
- rice (Oryza sativa L.)Oryza sativae1
- Treatment
- UV-B radiatione0
- Outcome
- soluble sugarse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soluble sugars and starch were rapidly and significantly reduced by within 1 day of enhanced UV-B radiation”
t0“UV-B-Induced Changes in Carbohydrate Content and Antioxidant Activity in Rice Seedling”
e1“rice (Oryza sativa L.)”
Claim · model-written summary
Enhanced UV-B rapidly and significantly reduced rice starch within one day.
- Taxon
- rice (Oryza sativa L.)Oryza sativae1
- Treatment
- UV-B radiatione0
- Outcome
- starche0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soluble sugars and starch were rapidly and significantly reduced by within 1 day of enhanced UV-B radiation”
t0“UV-B-Induced Changes in Carbohydrate Content and Antioxidant Activity in Rice Seedling”
e1“rice (Oryza sativa L.)”
Claim · model-written summary
UV-B initially increased rice leaf SOD activity.
- Taxon
- rice (Oryza sativa L.)Oryza sativae1
- Treatment
- UV-Bt0
- Outcome
- SOD activitye0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under UV-B treatments, SOD activity was initially increased”
t0“UV-B-Induced Changes in Carbohydrate Content and Antioxidant Activity in Rice Seedling”
e1“rice (Oryza sativa L.)”
Claim · model-written summary
UV-B slowly and slightly increased rice leaf CAT activity.
- Taxon
- rice (Oryza sativa L.)Oryza sativae1
- Treatment
- UV-Bt0
- Outcome
- CATe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CAT and POD activities were slowly and slightly increased”
t0“UV-B-Induced Changes in Carbohydrate Content and Antioxidant Activity in Rice Seedling”
e1“rice (Oryza sativa L.)”
Claim · model-written summary
UV-B slowly and slightly increased rice leaf POD activity.
- Taxon
- rice (Oryza sativa L.)Oryza sativae1
- Treatment
- UV-Bt0
- Outcome
- POD activitiese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CAT and POD activities were slowly and slightly increased”
t0“UV-B-Induced Changes in Carbohydrate Content and Antioxidant Activity in Rice Seedling”
e1“rice (Oryza sativa L.)”
Claim · model-written summary
APX activity showed no clear pattern with UV-B dose.
- Taxon
- rice (Oryza sativa L.)Oryza sativae1
- Treatment
- UV-Bt0
- Outcome
- APX activitye0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“APX activity showed no presumable results with an increase of UV-B dose”
t0“UV-B-Induced Changes in Carbohydrate Content and Antioxidant Activity in Rice Seedling”
e1“rice (Oryza sativa L.)”
Claim · model-written summary
Supplementary UV-B increased free putrescine in rice leaves.
- Taxon
- rice (Oryza sativa L.)Oryza sativae1
- Treatment
- UV-B radiatione0
- Outcome
- free putrescinee0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“supplementary UV-B radiation caused an increase in free putrescine and spermidine”
t0“UV-B-Induced Changes in Carbohydrate Content and Antioxidant Activity in Rice Seedling”
e1“rice (Oryza sativa L.)”
Claim · model-written summary
Supplementary UV-B increased spermidine in rice leaves.
- Taxon
- rice (Oryza sativa L.)Oryza sativae1
- Treatment
- UV-B radiatione0
- Outcome
- spermidinee0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“supplementary UV-B radiation caused an increase in free putrescine and spermidine”
t0“UV-B-Induced Changes in Carbohydrate Content and Antioxidant Activity in Rice Seedling”
e1“rice (Oryza sativa L.)”
Claim · model-written summary
Spermine generally remained unaltered under UV-B.
- Taxon
- rice (Oryza sativa L.)Oryza sativae1
- Treatment
- UV-Bt0
- Outcome
- sperminee0
- Direction
- unalterede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“spermine remained unaltered, although 24-hrs UV-B treatment slightly increased”
t0“UV-B-Induced Changes in Carbohydrate Content and Antioxidant Activity in Rice Seedling”
e1“rice (Oryza sativa L.)”
Claim · model-written summary
A 24-hour UV-B treatment slightly increased spermine.
- Taxon
- rice (Oryza sativa L.)Oryza sativae1
- Treatment
- UV-Bt0
- Outcome
- sperminee2
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“24-hrs UV-B treatment slightly increased”
t0“UV-B-Induced Changes in Carbohydrate Content and Antioxidant Activity in Rice Seedling”
e1“rice (Oryza sativa L.)”
e2“spermine remained unaltered”
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See all 17 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.