Abstract
The aim of this research is to study the effects of salt stress during different stages of development in transgenic tomato plants overexpressing the apple spermidine synthase gene (MdSPDS1) compared to wild type (WT) plants. Under salt treatment (100 and 150 mM NaCl), tomato plants clearly displayed several stress symptoms such as impaired seedling growth, decreased chlorophyll content, reduction in fruit yield and increased electrolyte leakage (EL) in leaves. These changes were more prominent in WT plants compared to MdSPDS1 transgenic plants which accumulate significantly more polyamines, namely spermine and spermidine. The response of ascorbate peroxidase (APX) isoenzymes in tomato leaves under saline conditions was also investigated. The transcript levels of SlApx genes were significantly up regulated under 100 mM NaCl either in wild type or in transgenic plants. Under 150 mM NaCl, only transgenic plants were capable to maintain high expression of SlApx genes, whereas in WT plants the expression declined after one month treatment. As a consequence, APX activity was significantly higher in MdSPDS1 transgenic plants compared to WT under saline conditions. These results suggest that elevated APX activity might contribute largely to the protection against oxidative stress generated by NaCl treatments and thus confer salinity tolerance in tomato overexpressing MdSPDS1.
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Claims 11
Claim · model-written summary
Salt treatment impaired tomato seedling growth.
- Taxon
- tomato
Solanum lycopersicume0 - Treatment
- salt treatment (100 and 150 mM NaCl)e0
- Outcome
- seedling growthe0
- Direction
- impairede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under salt treatment (100 and 150 mM NaCl), tomato plants clearly displayed several stress symptoms such as impaired seedling growth, decreased chlorophyll content, reduction in fruit yield and increased electrolyte leakage (EL) in leaves.”
Claim · model-written summary
Salt treatment decreased tomato chlorophyll content.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- salt treatment (100 and 150 mM NaCl)e0
- Outcome
- chlorophyll contente0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under salt treatment (100 and 150 mM NaCl), tomato plants clearly displayed several stress symptoms such as impaired seedling growth, decreased chlorophyll content, reduction in fruit yield and increased electrolyte leakage (EL) in leaves.”
Claim · model-written summary
Salt treatment reduced tomato fruit yield.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- salt treatment (100 and 150 mM NaCl)e0
- Outcome
- fruit yielde0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under salt treatment (100 and 150 mM NaCl), tomato plants clearly displayed several stress symptoms such as impaired seedling growth, decreased chlorophyll content, reduction in fruit yield and increased electrolyte leakage (EL) in leaves.”
Claim · model-written summary
Salt treatment increased tomato leaf electrolyte leakage.
- Taxon
- tomatoSolanum lycopersicume0
- Organ / stage
- leavese0
- Treatment
- salt treatment (100 and 150 mM NaCl)e0
- Outcome
- electrolyte leakage (EL)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under salt treatment (100 and 150 mM NaCl), tomato plants clearly displayed several stress symptoms such as impaired seedling growth, decreased chlorophyll content, reduction in fruit yield and increased electrolyte leakage (EL) in leaves.”
Claim · model-written summary
Salt symptoms were more prominent in wild type than MdSPDS1 transgenic tomato.
Verbatim
e0“These changes were more prominent in WT plants compared to MdSPDS1 transgenic plants which accumulate significantly more polyamines, namely spermine and spermidine.”
Claim · model-written summary
MdSPDS1 transgenic plants accumulated significantly more spermine and spermidine.
- Taxon
- plantsViridiplantaee0
- Treatment
- MdSPDS1 transgenice0
- Gene
- MdSPDS1e0
- Outcome
- spermine and spermidinee0
- Direction
- moree0
Not reportedComparator
Verbatim
e0“MdSPDS1 transgenic plants which accumulate significantly more polyamines, namely spermine and spermidine.”
Claim · model-written summary
At 100 mM NaCl, SlApx transcripts rose significantly in wild type and transgenic plants.
- Taxon
- plantsViridiplantaee0
- Treatment
- 100 mM NaCle0
- Gene
- SlApx genese0
- Outcome
- transcript levelse0
- Direction
- up regulatede0
Not reportedComparator
Verbatim
e0“The transcript levels of SlApx genes were significantly up regulated under 100 mM NaCl either in wild type or in transgenic plants.”
Claim · model-written summary
At 150 mM NaCl transgenic plants maintained high SlApx expression.
Verbatim
e0“Under 150 mM NaCl, only transgenic plants were capable to maintain high expression of SlApx genes, whereas in WT plants the expression declined after one month treatment.”
Claim · model-written summary
At 150 mM NaCl wild type SlApx expression declined after one month.
- Taxon
- plantsViridiplantaee0
- Material
- WT plantse0
- Treatment
- 150 mM NaCle0
- Gene
- SlApx genese0
- Outcome
- expressione0
- Direction
- declinede0
- Qualifier
- after one month treatmente0
Not reportedComparator
Verbatim
e0“Under 150 mM NaCl, only transgenic plants were capable to maintain high expression of SlApx genes, whereas in WT plants the expression declined after one month treatment.”
Claim · model-written summary
APX activity was significantly higher in MdSPDS1 transgenic plants than wild type under salinity.
Verbatim
e0“APX activity was significantly higher in MdSPDS1 transgenic plants compared to WT under saline conditions.”
Claim · model-written summary
The authors suggest elevated APX activity contributes to oxidative stress protection and salinity tolerance.
- Taxon
- tomatoSolanum lycopersicume0
- Gene
- APXe0
- Outcome
- salinity tolerancee0
- Qualifier
- protection against oxidative stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“elevated APX activity might contribute largely to the protection against oxidative stress generated by NaCl treatments and thus confer salinity tolerance in tomato overexpressing MdSPDS1.”
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