Abstract
Free radicals with a long lifetime were observed in the leaves of two rice cultivars (Oryza sativa L.), Sasanishiki (UVB resistant) and Norin-1 (UVB sensitive), by electron spin resonance spectroscopy. The leaves of both cultivars grown with visible light show very similar ESR spectra composed of radical 1 (R1) and radical 2 (R2), which may be attributable to P700 cation radicals in the reaction center of photosystem I, and tyrosine cation radicals in the reaction center of photosystem II, respectively. The ESR spectrum composed of R1 and R2 radicals in the leaves of Sasanishiki grown under visible light with supplemental UVB was similar to that in the plant grown without supplemental UVB. On the other hand, the amount of R2 radicals in the leaves of Norin-1 grown under visible light with supplemental UVB was significantly smaller than that in the plant grown without supplemental UVB. It is suggested that the loss of R2 radicals in Norin-1 upon UVB irradiation is related to the instability of the plant.
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Claims 4
Claim · model-written summary
Both rice cultivars showed similar R1 and R2 spectra under visible light.
Verbatim
e0“The leaves of both cultivars grown with visible light show very similar ESR spectra composed of radical 1 (R1) and radical 2 (R2)”
Claim · model-written summary
Sasanishiki spectra were similar with and without supplemental UVB.
- Taxon
- rice
Oryza sativat0 - Material
- Sasanishikie0
- Organ / stage
- leavese0
- Treatment
- supplemental UVBe0
- Outcome
- ESR spectrum composed of R1 and R2 radicalse0
- Direction
- similare0
- Comparator
- without supplemental UVBe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The ESR spectrum composed of R1 and R2 radicals in the leaves of Sasanishiki grown under visible light with supplemental UVB was similar to that in the plant grown without supplemental UVB.”
t0“rice”
Claim · model-written summary
Norin-1 R2 radicals were significantly lower with supplemental UVB.
- Taxon
- riceOryza sativat0
- Material
- Norin-1e0
- Organ / stage
- leavese0
- Treatment
- supplemental UVBe0
- Outcome
- amount of R2 radicalse0
- Direction
- smallere0
- Comparator
- without supplemental UVBe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the amount of R2 radicals in the leaves of Norin-1 grown under visible light with supplemental UVB was significantly smaller than that in the plant grown without supplemental UVB.”
t0“rice”
Claim · model-written summary
Authors related Norin-1 R2 radical loss under UVB to plant instability.
- Taxon
- riceOryza sativat0
- Material
- Norin-1e0
- Treatment
- UVB irradiatione0
- Outcome
- loss of R2 radicalse0
- Qualifier
- instability of the plante0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It is suggested that the loss of R2 radicals in Norin-1 upon UVB irradiation is related to the instability of the plant.”
t0“rice”
The same questions in other papers
uv · molecular: metabolites · Oryza sativa (rice)Positive and negative results
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- negative
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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.