Abstract
We investigated the effects of pretreatment with a low concentration of methyl viologen (MV) on the salinity-induced chloroplast degeneration in rice seedlings. The seedlings grown in hydroponic culture containing nutrient solution for 3 wks were treated with 100 nM MV mixed in the hydroponic culture for 3 days, and then with 200 mM NaCl without MV for 3 days. In the plants without MV pretreatment, the chlorophyll content drastically decreased during the NaCl treatment accompanied by swelling of thylakoids and destruction of thylakoid membranes. These damages were alleviated by the pretreatment with MV. The activities of CuZn-SOD and Fe-SOD, which localize in chloroplasts, increased under salt stress in both plants with and without MV pretreatment. In the plants under salt stress without MV pretreatment, ascorbate peroxidase (APX) activity did not differ from that of control. However, in MV-pretreated plants, APX activity under salt stress was about 1.2- to 1.3-fold higher than that of the control. Catalase (CAT) activity in NaCl treated plants was decreased to 52% of the control and the reduction in CAT activity was suppressed by MV pretreatment. These results suggest that MV reduced the damages by salt stress in chloroplasts by increasing APX activity and preventing the decrease in CAT activity.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by. 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 9
Claim · model-written summary
NaCl treatment drastically decreased chlorophyll content in rice seedlings without MV pretreatment.
- Taxon
- rice
Oryza sativae0 - Treatment
- NaCl treatmente1
- Outcome
- chlorophyll contente1
- Direction
- drastically decreasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in rice seedlings”
e1“In the plants without MV pretreatment, the chlorophyll content drastically decreased during the NaCl treatment accompanied by swelling of thylakoids and destruction of thylakoid membranes”
Claim · model-written summary
NaCl treatment without MV pretreatment accompanied swelling of thylakoids and destruction of thylakoid membranes in rice.
- Taxon
- riceOryza sativae0
- Treatment
- NaCl treatmente1
- Outcome
- swelling of thylakoids and destruction of thylakoid membranese1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in rice seedlings”
e1“In the plants without MV pretreatment, the chlorophyll content drastically decreased during the NaCl treatment accompanied by swelling of thylakoids and destruction of thylakoid membranes”
Claim · model-written summary
MV pretreatment alleviated salt-induced damage to chloroplasts in rice.
- Taxon
- riceOryza sativae0
- Treatment
- pretreatment with MVe2
- Outcome
- damagese2
- Direction
- alleviatede2
- Comparator
- without MV pretreatmente1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in rice seedlings”
e1“In the plants without MV pretreatment, the chlorophyll content drastically decreased during the NaCl treatment accompanied by swelling of thylakoids and destruction of thylakoid membranes”
e2“These damages were alleviated by the pretreatment with MV”
Claim · model-written summary
Salt stress increased CuZn-SOD and Fe-SOD activities in rice with and without MV pretreatment.
- Taxon
- riceOryza sativae0
- Treatment
- salt stresse3
- Gene
- CuZn-SOD and Fe-SODe3
- Outcome
- activities of CuZn-SOD and Fe-SODe3
- Direction
- increasede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in rice seedlings”
e3“The activities of CuZn-SOD and Fe-SOD, which localize in chloroplasts, increased under salt stress in both plants with and without MV pretreatment”
Claim · model-written summary
Under salt stress without MV pretreatment, APX activity in rice did not differ from control.
- Taxon
- riceOryza sativae0
- Treatment
- salt stresse4
- Gene
- ascorbate peroxidase (APX)e4
- Outcome
- ascorbate peroxidase (APX) activitye4
- Direction
- did not differe4
- Comparator
- controle4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in rice seedlings”
e4“In the plants under salt stress without MV pretreatment, ascorbate peroxidase (APX) activity did not differ from that of control”
Claim · model-written summary
Under salt stress, MV-pretreated rice had APX activity about 1.2- to 1.3-fold higher than control.
- Taxon
- riceOryza sativae0
- Treatment
- salt stresse5
- Gene
- APXe5
- Outcome
- APX activitye5
- Direction
- highere5
- Value
- 1.2- to 1.3-folde5
- Qualifier
- MV-pretreated plantse5
- Comparator
- controle5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in rice seedlings”
e5“However, in MV-pretreated plants, APX activity under salt stress was about 1.2- to 1.3-fold higher than that of the control”
Claim · model-written summary
NaCl treatment decreased CAT activity to 52% of control in rice.
- Taxon
- riceOryza sativae0
- Treatment
- NaCle6
- Gene
- CATe6
- Outcome
- Catalase (CAT) activitye6
- Direction
- decreasede6
- Value
- 52%e6
- Comparator
- controle6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in rice seedlings”
e6“Catalase (CAT) activity in NaCl treated plants was decreased to 52% of the control and the reduction in CAT activity was suppressed by MV pretreatment”
Claim · model-written summary
MV pretreatment suppressed the reduction in CAT activity under NaCl in rice.
- Taxon
- riceOryza sativae0
- Treatment
- MV pretreatmente6
- Gene
- CATe6
- Outcome
- reduction in CAT activitye6
- Direction
- suppressede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in rice seedlings”
e6“Catalase (CAT) activity in NaCl treated plants was decreased to 52% of the control and the reduction in CAT activity was suppressed by MV pretreatment”
Claim · model-written summary
MV reduced salt damage to chloroplasts in rice by increasing APX activity and preventing the decrease in CAT activity.
- Taxon
- riceOryza sativae0
- Treatment
- MVe7
- Outcome
- damagese7
- Qualifier
- by increasing APX activity and preventing the decrease in CAT activitye7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in rice seedlings”
e7“These results suggest that MV reduced the damages by salt stress in chloroplasts by increasing APX activity and preventing the decrease in CAT activity”
The same questions in other papers
sodium chloride · physiology: antioxidant enzymes · Oryza sativa (rice)Results differ
7 papers in the same direction as this paper · 9 in the opposite direction
- no effect
- positive
- positive
13 papers more in this group
See all 17 papers →sodium chloride · physiology: pigments · Oryza sativa (rice)Results differ
16 papers in the same direction as this paper · 3 in the opposite direction
- negative
- negative
- positive
16 papers more in this group
See all 20 papers →paraquat dichloride · physiology: antioxidant enzymes · Oryza sativa (rice)Positive and negative results
1 in the opposite direction
- negative
salinity · physiology: antioxidant enzymes · Oryza sativa (rice)Results differ
17 papers in the same direction as this paper · 25 in the opposite direction
- negative
- negative
- negative
39 papers more in this group
See all 43 papers →salinity · nutrient: content · Oryza sativa (rice)Positive and negative results
7 papers in the same direction as this paper · 32 in the opposite direction
- negative
- no effect
- negative
36 papers more in this group
See all 40 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.