Abstract
The physiological role of plant mitochondrial glutathione peroxidases is scarcely known. This study attempted to elucidate the role of a rice mitochondrial isoform (GPX1) in photosynthesis under normal growth and salinity conditions. GPX1 knockdown rice lines (GPX1s) were tested in absence and presence of 100 mM NaCl for 6 d. Growth reduction of GPX1s line under non-stressful conditions, compared with non-transformed (NT) plants occurred in parallel to increased H2 O2 and decreased GSH contents. These changes occurred concurrently with photosynthesis impairment, particularly in Calvin cycle's reactions, since photochemical efficiency did not change. Thus, GPX1 silencing and downstream molecular/metabolic changes modulated photosynthesis differentially. In contrast, salinity induced reduction in both phases of photosynthesis, which were more impaired in silenced plants. These changes were associated with root morphology alterations but not shoot growth. Both studied lines displayed increased GPX activity but H2 O2 content did not change in response to salinity. Transformed plants exhibited lower photorespiration, water use efficiency and root growth, indicating that GPX1 could be important to salt tolerance. Growth reduction of GPX1s line might be related to photosynthesis impairment, which in turn could have involved a cross talk mechanism between mitochondria and chloroplast originated from redox changes due to GPX1 deficiency.
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Claims 14
Claim · model-written summary
GPX1 silencing reduced growth of rice lines under non-stressful conditions compared with non-transformed plants.
- Taxon
- rice
Oryza sativat0 - Material
- GPX1s linee1
- Treatment
- GPX1 silencingt0
- Outcome
- Growthe1
- Direction
- reductione1
- Qualifier
- under non-stressful conditionse1
- Comparator
- non-transformed (NT) plantse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Mitochondrial GPX1 silencing triggers differential photosynthesis impairment in response to salinity in rice plants”
e1“Growth reduction of GPX1s line under non-stressful conditions, compared with non-transformed (NT) plants occurred in parallel to increased H2 O2 and decreased GSH contents”
Claim · model-written summary
GPX1s rice lines had increased H2 O2 compared with non-transformed plants.
- Taxon
- riceOryza sativat0
- Material
- GPX1s linee1
- Outcome
- H2 O2e1
- Direction
- increasede1
- Comparator
- non-transformed (NT) plantse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Mitochondrial GPX1 silencing triggers differential photosynthesis impairment in response to salinity in rice plants”
e1“Growth reduction of GPX1s line under non-stressful conditions, compared with non-transformed (NT) plants occurred in parallel to increased H2 O2 and decreased GSH contents”
Claim · model-written summary
GPX1s rice lines had decreased GSH contents compared with non-transformed plants.
- Taxon
- riceOryza sativat0
- Material
- GPX1s linee1
- Outcome
- GSH contentse1
- Direction
- decreasede1
- Comparator
- non-transformed (NT) plantse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Mitochondrial GPX1 silencing triggers differential photosynthesis impairment in response to salinity in rice plants”
e1“Growth reduction of GPX1s line under non-stressful conditions, compared with non-transformed (NT) plants occurred in parallel to increased H2 O2 and decreased GSH contents”
Claim · model-written summary
GPX1 silencing was associated with photosynthesis impairment in rice, particularly in Calvin cycle reactions.
- Taxon
- riceOryza sativat0
- Treatment
- GPX1 silencingt0
- Outcome
- photosynthesis impairmente1
- Direction
- decreaseinferrede1
- Qualifier
- particularly in Calvin cycle's reactionse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Mitochondrial GPX1 silencing triggers differential photosynthesis impairment in response to salinity in rice plants”
e1“These changes occurred concurrently with photosynthesis impairment, particularly in Calvin cycle's reactions, since photochemical efficiency did not change”
Claim · model-written summary
GPX1 silencing did not change photochemical efficiency in rice.
- Taxon
- riceOryza sativat0
- Treatment
- GPX1 silencingt0
- Outcome
- photochemical efficiencye1
- Direction
- did not changee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Mitochondrial GPX1 silencing triggers differential photosynthesis impairment in response to salinity in rice plants”
e1“These changes occurred concurrently with photosynthesis impairment, particularly in Calvin cycle's reactions, since photochemical efficiency did not change”
Claim · model-written summary
Salinity reduced both phases of photosynthesis in rice.
- Taxon
- riceOryza sativat0
- Treatment
- salinityt0
- Outcome
- both phases of photosynthesise1
- Direction
- reductione1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Mitochondrial GPX1 silencing triggers differential photosynthesis impairment in response to salinity in rice plants”
e1“In contrast, salinity induced reduction in both phases of photosynthesis, which were more impaired in silenced plants”
Claim · model-written summary
Silenced rice plants were more impaired in photosynthesis under salinity.
- Taxon
- riceOryza sativat0
- Material
- silenced plantse1
- Treatment
- salinityt0
- Outcome
- photosynthesise1
- Direction
- more impairede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Mitochondrial GPX1 silencing triggers differential photosynthesis impairment in response to salinity in rice plants”
e1“In contrast, salinity induced reduction in both phases of photosynthesis, which were more impaired in silenced plants”
Claim · model-written summary
Salinity-related changes were associated with root morphology alterations in rice.
- Taxon
- riceOryza sativat0
- Treatment
- salinityt0
- Outcome
- root morphology alterationse1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Mitochondrial GPX1 silencing triggers differential photosynthesis impairment in response to salinity in rice plants”
e1“These changes were associated with root morphology alterations but not shoot growth”
Claim · model-written summary
Salinity-related changes were not associated with shoot growth changes in rice.
- Taxon
- riceOryza sativat0
- Treatment
- salinityt0
- Outcome
- shoot growthe1
- Direction
- no_changeinferrede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Mitochondrial GPX1 silencing triggers differential photosynthesis impairment in response to salinity in rice plants”
e1“These changes were associated with root morphology alterations but not shoot growth”
Claim · model-written summary
Both studied rice lines displayed increased GPX activity in response to salinity.
- Taxon
- riceOryza sativat0
- Material
- Both studied linese1
- Treatment
- salinityt0
- Outcome
- GPX activitye1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Mitochondrial GPX1 silencing triggers differential photosynthesis impairment in response to salinity in rice plants”
e1“Both studied lines displayed increased GPX activity but H2 O2 content did not change in response to salinity”
Claim · model-written summary
H2 O2 content in rice did not change in response to salinity.
- Taxon
- riceOryza sativat0
- Treatment
- salinityt0
- Outcome
- H2 O2 contente1
- Direction
- did not changee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Mitochondrial GPX1 silencing triggers differential photosynthesis impairment in response to salinity in rice plants”
e1“Both studied lines displayed increased GPX activity but H2 O2 content did not change in response to salinity”
Claim · model-written summary
Transformed rice plants had lower photorespiration, water use efficiency and root growth.
- Taxon
- riceOryza sativat0
- Material
- Transformed plantse1
- Outcome
- photorespiration, water use efficiency and root growthe1
- Direction
- lowere1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Mitochondrial GPX1 silencing triggers differential photosynthesis impairment in response to salinity in rice plants”
e1“Transformed plants exhibited lower photorespiration, water use efficiency and root growth, indicating that GPX1 could be important to salt tolerance”
Claim · model-written summary
GPX1 could be important for salt tolerance in rice.
- Taxon
- riceOryza sativat0
- Gene
- GPX1e1
- Outcome
- salt tolerancee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Mitochondrial GPX1 silencing triggers differential photosynthesis impairment in response to salinity in rice plants”
e1“Transformed plants exhibited lower photorespiration, water use efficiency and root growth, indicating that GPX1 could be important to salt tolerance”
Claim · model-written summary
Growth reduction of GPX1-silenced rice may involve photosynthesis impairment through a cross talk mechanism between mitochondria and chloroplast from GPX1-deficiency redox changes.
- Taxon
- riceOryza sativat0
- Gene
- GPX1e1
- Outcome
- Growth reductione1
- Qualifier
- cross talk mechanism between mitochondria and chloroplaste1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Mitochondrial GPX1 silencing triggers differential photosynthesis impairment in response to salinity in rice plants”
e1“Growth reduction of GPX1s line might be related to photosynthesis impairment, which in turn could have involved a cross talk mechanism between mitochondria and chloroplast originated from redox changes due to GPX1 deficiency”
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