Abstract
The seedlings of Oryza sativa L. cv. Nipponbare grown by hydroponic culture for 3 wks were treated with 75, 100, 150 and 200 mM NaCl for 14, 14, 6 and 3 days, respectively, and examined for chloroplast ultrastructure in the region where chlorophyll fluorescence had been recorded. NaCl treatment decreased the ratio of variable to maximum chlorophyll fluorescence yield (Fv/Fm) and caused swelling of thylakoids. The swelling of thylakoids was quantified by the percentage of the length of swollen thylakoids to the total length of thylakoids. This value was increased with increasing NaCl concentration. Although Fv/Fm decreased at all concentrations of NaCl, the minimal fluorescence yield F0 was not increased by the treatment with 75 or 100 mM NaCl. The percentage of the length of swelling was low at 75 and 100 mM NaCl. On the other hand, F0 increased and the swelling of thylakoids was prominent with 150 and 200 mM NaCl treatment. These results suggest that the decrease in Fv/Fm due to the increase in F0 under salt stress correlates with the ultrastructural damage. The decrease in Fv/Fm due to the increase in F0 is expected to be useful as an indicator to evaluate the damage in chloroplasts, especially in thylakoid membranes, under salinity.
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Claims 9
Claim · model-written summary
NaCl treatment decreased Fv/Fm in rice seedlings.
- Taxon
- Oryza sativa L.
Oryza sativae1 - Material
- Nipponbaree1
- Treatment
- NaCl treatmente0
- Outcome
- ratio of variable to maximum chlorophyll fluorescence yield (Fv/Fm)e0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NaCl treatment decreased the ratio of variable to maximum chlorophyll fluorescence yield (Fv/Fm) and caused swelling of thylakoids.”
e1“The seedlings of Oryza sativa L. cv. Nipponbare”
Claim · model-written summary
NaCl treatment caused thylakoid swelling.
- Taxon
- Oryza sativa L.Oryza sativae1
- Material
- Nipponbaree1
- Treatment
- NaCl treatmente0
- Outcome
- swelling of thylakoidse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NaCl treatment decreased the ratio of variable to maximum chlorophyll fluorescence yield (Fv/Fm) and caused swelling of thylakoids.”
e1“The seedlings of Oryza sativa L. cv. Nipponbare”
Claim · model-written summary
The swollen thylakoid length percentage increased with NaCl concentration.
- Taxon
- Oryza sativa L.Oryza sativae2
- Material
- Nipponbaree2
- Treatment
- NaCl concentratione0
- Outcome
- percentage of the length of swollen thylakoids to the total length of thylakoidse1
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This value was increased with increasing NaCl concentration.”
e1“The swelling of thylakoids was quantified by the percentage of the length of swollen thylakoids to the total length of thylakoids.”
e2“The seedlings of Oryza sativa L. cv. Nipponbare”
Claim · model-written summary
F0 did not increase at 75 or 100 mM NaCl.
- Taxon
- Oryza sativa L.Oryza sativae1
- Treatment
- 75 or 100 mM NaCle0
- Outcome
- minimal fluorescence yield F0e0
- Direction
- not increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the minimal fluorescence yield F0 was not increased by the treatment with 75 or 100 mM NaCl.”
e1“The seedlings of Oryza sativa L. cv. Nipponbare”
Claim · model-written summary
Swelling percentage was low under 75 and 100 mM NaCl.
- Taxon
- Oryza sativa L.Oryza sativae1
- Treatment
- 75 and 100 mM NaCle0
- Outcome
- percentage of the length of swellinge0
- Direction
- lowe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The percentage of the length of swelling was low at 75 and 100 mM NaCl.”
e1“The seedlings of Oryza sativa L. cv. Nipponbare”
Claim · model-written summary
F0 increased under 150 and 200 mM NaCl.
- Taxon
- Oryza sativa L.Oryza sativae1
- Treatment
- 150 and 200 mM NaCl treatmente0
- Outcome
- F0e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“F0 increased and the swelling of thylakoids was prominent with 150 and 200 mM NaCl treatment.”
e1“The seedlings of Oryza sativa L. cv. Nipponbare”
Claim · model-written summary
Thylakoid swelling was prominent under 150 and 200 mM NaCl.
- Taxon
- Oryza sativa L.Oryza sativae1
- Treatment
- 150 and 200 mM NaCl treatmente0
- Outcome
- swelling of thylakoidse0
- Direction
- prominente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“F0 increased and the swelling of thylakoids was prominent with 150 and 200 mM NaCl treatment.”
e1“The seedlings of Oryza sativa L. cv. Nipponbare”
Claim · model-written summary
The authors suggest that Fv/Fm decline due to increased F0 correlates with ultrastructural damage.
- Taxon
- Oryza sativa L.Oryza sativae1
- Treatment
- salt stresse0
- Outcome
- ultrastructural damagee0
- Qualifier
- decrease in Fv/Fm due to the increase in F0e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the decrease in Fv/Fm due to the increase in F0 under salt stress correlates with the ultrastructural damage.”
e1“The seedlings of Oryza sativa L. cv. Nipponbare”
Claim · model-written summary
The authors expect Fv/Fm decline due to F0 increase to indicate chloroplast damage under salinity.
- Taxon
- Oryza sativa L.Oryza sativae1
- Outcome
- damage in chloroplastse0
- Value
- Fv/Fme0
- Qualifier
- under salinitye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The decrease in Fv/Fm due to the increase in F0 is expected to be useful as an indicator to evaluate the damage in chloroplasts, especially in thylakoid membranes, under salinity.”
e1“The seedlings of Oryza sativa L. cv. Nipponbare”
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