Abstract
UV-B radiation is a major abiotic stress factor that adversely affects the growth and productivity of crop plants including rice (Oryza sativa L.). However, on the other hand, lower doses of UV-B radiation applied to seeds can have a priming effect on plants emerging from it. In this study, seeds of O. sativa var. kanchana were primed with UV-B radiation (6 kJ m-2) and were further subjected to NaCl, polyethylene glycol 6000 (PEG) and UV-B stress. The effects of UV-B priming in imparting NaCl, PEG and UV-B stress tolerance to rice seedlings were analysed through various photosynthetic features and antioxidative mechanisms. PSI and PSII activity levels as well as chl a fluorescence were found to be significantly higher in the UV-B primed and unstressed seedlings. When stress (NaCl, PEG and high UV-B) was imposed, increased PSI and PSII activity levels, chl a fluorescence and metabolite accumulation (proline, total phenolics and sugar) as well as nonenzymatic (ascorbate and glutathione) and enzymatic (superoxide dismutase, catalase, ascorbate peroxidase) antioxidants were recorded in UV-B primed and NaCl-stressed plants followed by UV-B primed and UV-B-stressed plants, and primed and PEG-stressed, compared with unprimed and stressed conditions. The results indicate that UV-B priming in rice seedlings effectively enhances the NaCl stress tolerance potential in rice to a greater extent than UV-B and PEG stress tolerance potential. The cost-effectiveness of UV-B seed priming is predominantly clear from the differing tolerance responses of rice seedlings exposed to different stress conditions.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 7
Claim · model-written summary
UV-B priming raised PSI and PSII activity in unstressed rice seedlings.
- Taxon
- rice
Oryza sativat0 - Treatment
- UV-B primede0
- Outcome
- PSI and PSII activity levelse0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PSI and PSII activity levels as well as chl a fluorescence were found to be significantly higher in the UV-B primed and unstressed seedlings”
t0“rice seedlings”
Claim · model-written summary
UV-B priming raised chlorophyll a fluorescence in unstressed seedlings.
- Taxon
- riceOryza sativat0
- Treatment
- UV-B primede0
- Outcome
- chl a fluorescencee0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PSI and PSII activity levels as well as chl a fluorescence were found to be significantly higher in the UV-B primed and unstressed seedlings”
t0“rice seedlings”
Claim · model-written summary
Under salt stress, UV-B priming increased PSI and PSII activity and chlorophyll fluorescence compared with unprimed stressed seedlings.
- Taxon
- riceOryza sativat0
- Treatment
- UV-B primed and NaCl-stressede0
- Outcome
- PSI and PSII activity levels, chl a fluorescencee0
- Direction
- increasede0
- Comparator
- unprimed and stressed conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased PSI and PSII activity levels, chl a fluorescence and metabolite accumulation (proline, total phenolics and sugar) as well as nonenzymatic (ascorbate and glutathione) and enzymatic (superoxide dismutase, catalase, ascorbate peroxidase) antioxidants were recorded in UV-B primed and NaCl-stressed plants followed by UV-B primed and UV-B-stressed plants, and primed and PEG-stressed, compared with unprimed and stressed conditions”
t0“rice seedlings”
Claim · model-written summary
Under salt stress, UV-B priming increased proline, phenolics, and sugar accumulation.
- Taxon
- riceOryza sativat0
- Treatment
- UV-B primed and NaCl-stressede0
- Outcome
- metabolite accumulation (proline, total phenolics and sugar)e0
- Direction
- increasede0
- Comparator
- unprimed and stressed conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased PSI and PSII activity levels, chl a fluorescence and metabolite accumulation (proline, total phenolics and sugar) as well as nonenzymatic (ascorbate and glutathione) and enzymatic (superoxide dismutase, catalase, ascorbate peroxidase) antioxidants were recorded in UV-B primed and NaCl-stressed plants followed by UV-B primed and UV-B-stressed plants, and primed and PEG-stressed, compared with unprimed and stressed conditions”
t0“rice seedlings”
Claim · model-written summary
Under salt stress, UV-B priming increased nonenzymatic antioxidants.
- Taxon
- riceOryza sativat0
- Treatment
- UV-B primed and NaCl-stressede0
- Outcome
- nonenzymatic (ascorbate and glutathione)e0
- Direction
- increasede0
- Comparator
- unprimed and stressed conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased PSI and PSII activity levels, chl a fluorescence and metabolite accumulation (proline, total phenolics and sugar) as well as nonenzymatic (ascorbate and glutathione) and enzymatic (superoxide dismutase, catalase, ascorbate peroxidase) antioxidants were recorded in UV-B primed and NaCl-stressed plants followed by UV-B primed and UV-B-stressed plants, and primed and PEG-stressed, compared with unprimed and stressed conditions”
t0“rice seedlings”
Claim · model-written summary
Under salt stress, UV-B priming increased SOD, catalase, and ascorbate peroxidase antioxidants.
- Taxon
- riceOryza sativat0
- Treatment
- UV-B primed and NaCl-stressede0
- Outcome
- enzymatic (superoxide dismutase, catalase, ascorbate peroxidase) antioxidantse0
- Direction
- increasede0
- Comparator
- unprimed and stressed conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased PSI and PSII activity levels, chl a fluorescence and metabolite accumulation (proline, total phenolics and sugar) as well as nonenzymatic (ascorbate and glutathione) and enzymatic (superoxide dismutase, catalase, ascorbate peroxidase) antioxidants were recorded in UV-B primed and NaCl-stressed plants followed by UV-B primed and UV-B-stressed plants, and primed and PEG-stressed, compared with unprimed and stressed conditions”
t0“rice seedlings”
Claim · model-written summary
UV-B priming enhanced salt stress tolerance more than UV-B or PEG stress tolerance.
- Taxon
- riceOryza sativae0
- Treatment
- UV-B priminge0
- Outcome
- NaCl stress tolerance potentiale0
- Direction
- greatere0
- Comparator
- UV-B and PEG stress tolerance potentiale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“UV-B priming in rice seedlings effectively enhances the NaCl stress tolerance potential in rice to a greater extent than UV-B and PEG stress tolerance potential”
The same questions in other papers
sodium chloride · physiology: antioxidant enzymes · Oryza sativa (rice)Results differ
8 papers in the same direction as this paper · 8 in the opposite direction
- no effect
- negative
- no effect
13 papers more in this group
See all 17 papers →sodium chloride · physiology: osmolytes · Oryza sativa (rice)Positive and negative results
8 papers in the same direction as this paper · 2 in the opposite direction
- negative
- negative
- positive
7 papers more in this group
See all 11 papers →sodium chloride · physiology: photosynthesis · Oryza sativa (rice)Positive and negative results
22 in the opposite direction
- negative
- no effect
- negative
19 papers more in this group
See all 23 papers →sodium chloride · molecular: metabolites · Oryza sativa (rice)Positive and negative results
13 papers in the same direction as this paper · 24 in the opposite direction
- negative
- negative
- no effect
34 papers more in this group
See all 38 papers →uv · physiology: osmolytes · Oryza sativa (rice)Positive and negative results
4 in the opposite direction
- negative
- negative
- negative
1 paper more in this group
See all 5 papers →uv · physiology: antioxidant enzymes · Oryza sativa (rice)Positive and negative results
6 papers in the same direction as this paper · 4 in the opposite direction
- no effect
- negative
- negative
7 papers more in this group
See all 11 papers →uv · molecular: metabolites · Oryza sativa (rice)Positive and negative results
5 papers in the same direction as this paper · 11 in the opposite direction
- negative
- negative
- negative
13 papers more in this group
See all 17 papers →uv · physiology: photosynthesis · Oryza sativa (rice)Positive and negative results
2 papers in the same direction as this paper · 16 in the opposite direction
- negative
- negative
- negative
15 papers more in this group
See all 19 papers →8 of 12 groups shown: named compounds and organisms first, then groups whose results differ (checked claim by claim), then those with positive and negative results, then the smaller groups.
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.