Abstract
This study focuses on the growth and morpho-physiological responses of the Malaysian commercial variety MR219 rice to salinity stress during the early vegetative stages, specifically during germination and the five-leaf stage. For germination responses, MR219 seeds were grown for 10 days in different salt concentrations. Low salinity significantly improves seed germination and increases the total number of germinated seeds. However, higher salinity (160 mM NaCl) inhibits the germination of MR219 seeds and reduces the total number of germinated seeds by 93.3%. The effects of salinity on the five-leaf stage of MR219 were also determined and compared to the salinity-tolerant (Pokkali) and susceptible (IR64) varieties. There were significant reductions in the photosynthesis rate, transpiration rate, stomatal conductance, and leaf chlorophyll content by 28.1%, 58.6%, 81.1%, and 3.7%, respectively. These reductions could contribute to the significant decrease in growth parameters measured throughout the treatment period. Based on the principal component analysis (PCA) result, MR219 is more tolerant to salinity than IR64, but is less tolerant than Pokkali. Further investigation on stress-related gene expression suggests that significant changes in the transcript level of genes involved in gamma-aminobutyric acid (GABA) shunt, ion transport, and reactive oxygen species detoxification could be attributed to the adaptation and tolerance level of each variety to salinity stress.
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Claims 9
Claim · model-written summary
Low salinity significantly improved MR219 germination and increased the number of germinated seeds.
- Taxon
- rice
Oryza sativat0 - Material
- MR219e1
- Treatment
- Low salinitye0
- Outcome
- seed germination and increases the total number of germinated seedse0
- Direction
- improvese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Low salinity significantly improves seed germination and increases the total number of germinated seeds.”
t0“Rice Varieties in Response to Salinity Stress”
e1“Malaysian commercial variety MR219 rice to salinity stress”
Claim · model-written summary
At 160 mM NaCl, MR219 had 93.3% fewer germinated seeds.
- Taxon
- riceOryza sativat0
- Material
- MR219e0
- Treatment
- higher salinity (160 mM NaCl)e0
- Outcome
- total number of germinated seedse0
- Direction
- reducese0
- Value
- 93.3%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher salinity (160 mM NaCl) inhibits the germination of MR219 seeds and reduces the total number of germinated seeds by 93.3%.”
t0“Rice Varieties in Response to Salinity Stress”
e1“Malaysian commercial variety MR219 rice to salinity stress”
Claim · model-written summary
Salinity reduced photosynthesis rate by 28.1%.
- Taxon
- riceOryza sativat0
- Treatment
- salinityt0
- Outcome
- photosynthesis ratee0
- Direction
- reductionse0
- Value
- 28.1%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There were significant reductions in the photosynthesis rate, transpiration rate, stomatal conductance, and leaf chlorophyll content by 28.1%, 58.6%, 81.1%, and 3.7%, respectively.”
t0“Rice Varieties in Response to Salinity Stress”
e1“Malaysian commercial variety MR219 rice to salinity stress”
Claim · model-written summary
Salinity reduced transpiration rate by 58.6%.
- Taxon
- riceOryza sativat0
- Treatment
- salinityt0
- Outcome
- transpiration ratee0
- Direction
- reductionse0
- Value
- 58.6%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There were significant reductions in the photosynthesis rate, transpiration rate, stomatal conductance, and leaf chlorophyll content by 28.1%, 58.6%, 81.1%, and 3.7%, respectively.”
t0“Rice Varieties in Response to Salinity Stress”
e1“Malaysian commercial variety MR219 rice to salinity stress”
Claim · model-written summary
Salinity reduced stomatal conductance by 81.1%.
- Taxon
- riceOryza sativat0
- Treatment
- salinityt0
- Outcome
- stomatal conductancee0
- Direction
- reductionse0
- Value
- 81.1%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There were significant reductions in the photosynthesis rate, transpiration rate, stomatal conductance, and leaf chlorophyll content by 28.1%, 58.6%, 81.1%, and 3.7%, respectively.”
t0“Rice Varieties in Response to Salinity Stress”
e1“Malaysian commercial variety MR219 rice to salinity stress”
Claim · model-written summary
Salinity reduced leaf chlorophyll content by 3.7%.
- Taxon
- riceOryza sativat0
- Treatment
- salinityt0
- Outcome
- leaf chlorophyll contente0
- Direction
- reductionse0
- Value
- 3.7%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There were significant reductions in the photosynthesis rate, transpiration rate, stomatal conductance, and leaf chlorophyll content by 28.1%, 58.6%, 81.1%, and 3.7%, respectively.”
t0“Rice Varieties in Response to Salinity Stress”
e1“Malaysian commercial variety MR219 rice to salinity stress”
Claim · model-written summary
The physiological reductions could contribute to decreased growth parameters.
- Taxon
- riceOryza sativat0
- Outcome
- growth parameterse0
- Direction
- decreasee0
- Qualifier
- These reductionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These reductions could contribute to the significant decrease in growth parameters measured throughout the treatment period.”
t0“Rice Varieties in Response to Salinity Stress”
e1“Malaysian commercial variety MR219 rice to salinity stress”
Claim · model-written summary
PCA placed MR219 above IR64 but below Pokkali for salinity tolerance.
- Taxon
- riceOryza sativat0
- Material
- MR219e0
- Outcome
- more tolerant to salinity than IR64, but is less tolerant than Pokkalie0
- Comparator
- IR64e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Based on the principal component analysis (PCA) result, MR219 is more tolerant to salinity than IR64, but is less tolerant than Pokkali.”
t0“Rice Varieties in Response to Salinity Stress”
e1“Malaysian commercial variety MR219 rice to salinity stress”
Claim · model-written summary
Stress-related transcript levels changed significantly across rice varieties.
- Taxon
- riceOryza sativat0
- Gene
- genes involved in gamma-aminobutyric acid (GABA) shunt, ion transport, and reactive oxygen species detoxificatione0
- Outcome
- transcript levele0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significant changes in the transcript level of genes involved in gamma-aminobutyric acid (GABA) shunt, ion transport, and reactive oxygen species detoxification could be attributed to the adaptation and tolerance level of each variety to salinity stress.”
t0“Rice Varieties in Response to Salinity Stress”
e1“Malaysian commercial variety MR219 rice to salinity stress”
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