Abstract
The contents of Na, K, CI, chlorophyll and the foliar ultrastructure of rice seedlings grown in NaCl solution at various concentrations were investigated under light and dark conditions. The seedlings were first grown in water for 7 d under a light condition and then in NaCl solutions at various concentrations for 24 h under a light or dark condition. The Na and CI contents in the 3rd leaves increased as the concentration of NaCl in the culture solution increased, and were significantly higher under a light condition than under a dark condition. The K content was scarcely influenced by the NaCl concentration under both conditions. The chlorophyll content in the 3rd leaves of the seedlings decreased as the NaCl concentrations of the culture solution increased under a light condition but not under a dark condition. In the 3rd leaves of the seedlings grown in the NaCl solution under a light condition, the thylakoids of chloroplasts in mesophyll cells were swollen and showed a wavy configuration. Under a dark condition, however, the thylakoids appeared intact under saline conditions although the leaves accumulated a large amount of Na and CI than in a light condition. The present study suggests that the damages in the chloroplasts, such as a decrease in the chlorophyll content and the degradation of thylakoids, were caused by a light-dependent reaction and not directly by accumulation of excess salt.
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Claims 6
Claim · model-written summary
Sodium and chloride in third leaves increased with NaCl concentration and were significantly higher under light than darkness.
- Taxon
- rice
Oryza sativae1 - Organ / stage
- 3rd leavese0
- Treatment
- NaCle0
- Outcome
- Na and CI contentse0
- Direction
- increasede0
- Comparator
- dark conditione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Na and CI contents in the 3rd leaves increased as the concentration of NaCl in the culture solution increased, and were significantly higher under a light condition than under a dark condition.”
e1“rice”
Claim · model-written summary
Potassium content was scarcely influenced by NaCl concentration in either light or dark conditions.
- Taxon
- riceOryza sativae1
- Treatment
- NaCl concentratione0
- Outcome
- K contente0
- Direction
- scarcely influencede0
- Qualifier
- under both conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The K content was scarcely influenced by the NaCl concentration under both conditions.”
e1“rice”
Claim · model-written summary
Third-leaf chlorophyll declined as NaCl concentration increased in light, but not in darkness.
- Taxon
- riceOryza sativae1
- Organ / stage
- 3rd leavese0
- Treatment
- NaCl concentrationse0
- Outcome
- chlorophyll contente0
- Direction
- decreasede0
- Comparator
- dark conditione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The chlorophyll content in the 3rd leaves of the seedlings decreased as the NaCl concentrations of the culture solution increased under a light condition but not under a dark condition.”
e1“rice”
Claim · model-written summary
Saline rice seedlings in light had swollen, wavy mesophyll chloroplast thylakoids.
- Taxon
- riceOryza sativae1
- Organ / stage
- 3rd leavese0
- Treatment
- NaCl solution under a light conditione0
- Outcome
- thylakoids of chloroplastse0
- Direction
- swollen and showed a wavy configuratione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the 3rd leaves of the seedlings grown in the NaCl solution under a light condition, the thylakoids of chloroplasts in mesophyll cells were swollen and showed a wavy configuration.”
e1“rice seedlings”
Claim · model-written summary
Under darkness, thylakoids appeared intact under saline conditions despite high leaf sodium and chloride.
- Taxon
- riceOryza sativae1
- Treatment
- saline conditionse0
- Outcome
- thylakoidse0
- Direction
- intacte0
- Qualifier
- dark conditione0
- Comparator
- light conditione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under a dark condition, however, the thylakoids appeared intact under saline conditions although the leaves accumulated a large amount of Na and CI than in a light condition.”
e1“rice seedlings”
Claim · model-written summary
The authors attribute chlorophyll decline and thylakoid degradation to a light-dependent reaction rather than salt accumulation directly.
- Taxon
- riceOryza sativae1
- Outcome
- damages in the chloroplastse0
- Qualifier
- light-dependent reactione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The present study suggests that the damages in the chloroplasts, such as a decrease in the chlorophyll content and the degradation of thylakoids, were caused by a light-dependent reaction and not directly by accumulation of excess salt.”
e1“rice seedlings”
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