Abstract
Acclimation to crop niches for thousands of years has made indigenous rice cultivars better suited for stress-prone environments. Still, their response to UV-B resiliency is unknown. 38 rice landraces were grown in cemented pots in a randomised block design with three replicates under open field conditions in Sambalpur University in the wet season of 2022. Half of the plants in each of the cultivars were administered UV-B radiation at the panicle emergence stage in an adjustable UV-B chamber permitting sunlight, and the effects of the stress on various morpho-physiological features, such as spikelet sterility, flag leaf photosynthetic and flavonoid pigment contents, and lipid peroxidation activities, were estimated for calibration of stress resistance. The experiment identified Swarnaprabha and Lalkain as the most sensitive and resilient to stress respectively, and the differential response between them was further revealed in the expression of genes related to UV-B sensitivity. Subject to the stress, Swarnaprabha exhibited symptoms of injuries, like leaf burns, and a higher loss of various photosynthetic parameters, such as pigment contents, SPAD and Fv/Fm, ETR and qP values, while NPQ increased only in Lalkain. Exposure to UV-B increased the total phenolic and flavonoid contents in Lalkain while depressing them in Swarnaprabha. Such an effect amounted to a higher release of fluorescent energy in the latter. The levels of expression of gene families controlling flavonoid activation and UV-B signal transduction, such as OsWRKY, OsUGT, OsRLCK, OsBZIP, OsGLP, and CPD photolyase were similar in both the cultivars in the control condition. However, exposure to UV-B stress overexpressed them in resilient cultivars only. The magnitude of expression of the genes and the impact of the stress on photosynthetic parameters, phenolic compounds and pubescent hair structure at the panicle emergence stage could be valid indicators among indigenous rice for UV-B tolerance.
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Claims 11
Claim · model-written summary
Swarnaprabha was most UV-B sensitive.
- Taxon
- rice
Oryza sativae1 - Material
- Swarnaprabhae0
- Outcome
- most sensitivee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Swarnaprabha and Lalkain as the most sensitive and resilient to stress respectively”
e1“rice landraces”
Claim · model-written summary
Lalkain was most UV-B resilient.
- Taxon
- riceOryza sativae1
- Material
- Lalkaine0
- Outcome
- resilient to stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Swarnaprabha and Lalkain as the most sensitive and resilient to stress respectively”
e1“rice landraces”
Claim · model-written summary
UV-B caused leaf-burn symptoms in Swarnaprabha.
- Taxon
- riceOryza sativae2
- Material
- Swarnaprabhae0
- Treatment
- UV-B radiatione1
- Outcome
- leaf burnse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Subject to the stress, Swarnaprabha exhibited symptoms of injuries, like leaf burns”
e1“UV-B radiation”
e2“rice landraces”
Claim · model-written summary
Swarnaprabha lost more photosynthetic pigments, SPAD, Fv/Fm, ETR and qP under UV-B.
- Taxon
- riceOryza sativae2
- Material
- Swarnaprabhae1
- Outcome
- pigment contents, SPAD and Fv/Fm, ETR and qP valuese0
- Direction
- higher losse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a higher loss of various photosynthetic parameters, such as pigment contents, SPAD and Fv/Fm, ETR and qP values”
e1“Swarnaprabha exhibited symptoms of injuries”
e2“rice landraces”
Claim · model-written summary
NPQ increased only in Lalkain under UV-B.
- Taxon
- riceOryza sativae1
- Material
- Lalkaine0
- Outcome
- NPQe0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NPQ increased only in Lalkain”
e1“rice landraces”
Claim · model-written summary
UV-B increased total phenolic and flavonoid contents in Lalkain.
- Taxon
- riceOryza sativae1
- Material
- Lalkaine0
- Treatment
- Exposure to UV-Be0
- Outcome
- total phenolic and flavonoid contentse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exposure to UV-B increased the total phenolic and flavonoid contents in Lalkain”
e1“rice landraces”
Claim · model-written summary
UV-B depressed total phenolic and flavonoid contents in Swarnaprabha.
- Taxon
- riceOryza sativae2
- Material
- Swarnaprabhae0
- Treatment
- Exposure to UV-Be0
- Outcome
- total phenolic and flavonoid contentse1
- Direction
- depressinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exposure to UV-B increased the total phenolic and flavonoid contents in Lalkain while depressing them in Swarnaprabha”
e1“total phenolic and flavonoid contents”
e2“rice landraces”
Claim · model-written summary
Swarnaprabha released more fluorescent energy under UV-B.
- Taxon
- riceOryza sativae2
- Material
- Swarnaprabhae1
- Outcome
- release of fluorescent energye0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Such an effect amounted to a higher release of fluorescent energy in the latter”
e1“Swarnaprabha exhibited symptoms of injuries”
e2“rice landraces”
Claim · model-written summary
The listed UV-B and flavonoid genes had similar expression in both cultivars under control conditions.
- Taxon
- riceOryza sativae1
- Gene
- OsWRKY, OsUGT, OsRLCK, OsBZIP, OsGLP, and CPD photolyasee0
- Outcome
- levels of expressione0
- Direction
- similare0
- Qualifier
- control conditione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The levels of expression of gene families controlling flavonoid activation and UV-B signal transduction, such as OsWRKY, OsUGT, OsRLCK, OsBZIP, OsGLP, and CPD photolyase were similar in both the cultivars in the control condition”
e1“rice landraces”
Claim · model-written summary
UV-B overexpressed the listed genes only in resilient cultivars.
- Taxon
- riceOryza sativae2
- Treatment
- exposure to UV-B stresse0
- Gene
- OsWRKY, OsUGT, OsRLCK, OsBZIP, OsGLP, and CPD photolyasee1
- Outcome
- overexpressede0
- Direction
- overexpressede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exposure to UV-B stress overexpressed them in resilient cultivars only”
e1“OsWRKY, OsUGT, OsRLCK, OsBZIP, OsGLP, and CPD photolyase”
e2“rice landraces”
Claim · model-written summary
Gene expression and photosynthetic, phenolic and hair traits may indicate UV-B tolerance in indigenous rice.
Verbatim
e0“The magnitude of expression of the genes and the impact of the stress on photosynthetic parameters, phenolic compounds and pubescent hair structure at the panicle emergence stage could be valid indicators among indigenous rice for UV-B tolerance”
The same questions in other papers
uv · quality: phytochemicals · Oryza sativa (rice)Positive and negative results
5 papers in the same direction as this paper · 2 in the opposite direction
- negative
- no effect
- positive
4 papers more in this group
See all 8 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.