Abstract
An objective of this investigation was to compare the transcriptional expression of starch metabolism involving genes, soluble sugar, physiological changes and yield components in flag leaf of two contrasting indica rice genotypes, Homjan (HJ; salt-tolerant) and Pathumthani 1 (PT1; salt-sensitive), in response to 150 mM NaCl salt stress. AGPL1, SBEIIb and GWD starch involved genes were up-regulated in salt stressed PT1, leading to accumulation of soluble starch, glucose fructose and total soluble sugars. In HJ, expression levels of AGPL1 AGPS2b, SBEIIb genes in salt stressed plants were higher than in control plants while the soluble sugar level in flag leaf was unchanged. Also, an expression level of some starch related genes i.e. AGPL1, SSI, SBEIIb, ISA2a, and GWD in HJ salt stressed plants was lower than that in PT1. Water use efficiency in salt stressed PT1 was significantly dropped for 35.42% whereas that in HJ was unchanged. Chlorophyll b (Chlb) and total chlorophyll (TC) contents in salt stressed PT1 were significantly degraded for 61.76% and 44.93%, respectively, leading to reduce net photosynthetic rate (Pn). The starch metabolism and sugar accumulation in PT1 were clearly unrelated with salt tolerant ability. In contrast, the starch degradation, photosynthetic abilities and sugar accumulation in salt stressed HJ may play a key role as osmoregulation salt defense mechanism, leading to maintain productivity when subjected to salt stress.
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Claims 12
Claim · model-written summary
Salt stress up-regulated AGPL1, SBEIIb and GWD in PT1.
- Taxon
- rice
Oryza sativat0 - Material
- PT1e0
- Treatment
- salt stressede0
- Gene
- AGPL1, SBEIIb and GWDe0
- Outcome
- starch involved genese0
- Direction
- up-regulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“AGPL1, SBEIIb and GWD starch involved genes were up-regulated in salt stressed PT1”
t0“rice”
Claim · model-written summary
Salt-stressed PT1 accumulated starch, glucose, fructose and soluble sugars.
- Taxon
- riceOryza sativat0
- Material
- PT1e1
- Treatment
- salt stressede1
- Outcome
- soluble starch, glucose fructose and total soluble sugarse0
- Direction
- accumulatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“leading to accumulation of soluble starch, glucose fructose and total soluble sugars”
e1“in salt stressed PT1, leading to accumulation”
t0“rice”
Claim · model-written summary
In HJ, salt stress raised expression of AGPL1, AGPS2b and SBEIIb versus control.
- Taxon
- riceOryza sativat0
- Material
- HJe0
- Treatment
- salt stressede0
- Gene
- AGPL1 AGPS2b, SBEIIbe0
- Outcome
- expression levelse0
- Direction
- highere0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In HJ, expression levels of AGPL1 AGPS2b, SBEIIb genes in salt stressed plants were higher than in control plants”
t0“rice”
Claim · model-written summary
HJ flag-leaf soluble sugar did not change under salt stress.
- Taxon
- riceOryza sativat0
- Material
- HJe1
- Treatment
- salt stressede1
- Outcome
- soluble sugar level in flag leafe0
- Direction
- unchangede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the soluble sugar level in flag leaf was unchanged”
e1“In HJ, expression levels of AGPL1 AGPS2b, SBEIIb genes in salt stressed plants”
t0“rice”
Claim · model-written summary
Salt-stressed HJ expressed five starch genes less than PT1.
- Taxon
- riceOryza sativat0
- Material
- HJe0
- Gene
- AGPL1, SSI, SBEIIb, ISA2a, and GWDe0
- Outcome
- expression levele0
- Direction
- lowere0
- Comparator
- PT1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“expression level of some starch related genes i.e. AGPL1, SSI, SBEIIb, ISA2a, and GWD in HJ salt stressed plants was lower than that in PT1”
t0“rice”
Claim · model-written summary
Salt stress significantly reduced PT1 water-use efficiency by 35.42%.
- Taxon
- riceOryza sativat0
- Material
- PT1e0
- Treatment
- salt stressede0
- Outcome
- Water use efficiencye0
- Direction
- droppede0
- Value
- 35.42%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water use efficiency in salt stressed PT1 was significantly dropped for 35.42%”
t0“rice”
Claim · model-written summary
HJ water-use efficiency remained unchanged under salt stress.
- Taxon
- riceOryza sativat0
- Material
- HJe0
- Treatment
- salt stressede1
- Outcome
- Water use efficiencye1
- Direction
- unchangede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“whereas that in HJ was unchanged”
e1“Water use efficiency in salt stressed PT1”
t0“rice”
Claim · model-written summary
Salt stress significantly degraded PT1 chlorophyll b by 61.76%.
- Taxon
- riceOryza sativat0
- Material
- PT1e0
- Treatment
- salt stressede0
- Outcome
- Chlorophyll b (Chlb)e0
- Direction
- degradede0
- Value
- 61.76%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chlorophyll b (Chlb) and total chlorophyll (TC) contents in salt stressed PT1 were significantly degraded for 61.76% and 44.93%, respectively”
t0“rice”
Claim · model-written summary
Salt stress significantly degraded PT1 total chlorophyll by 44.93%.
- Taxon
- riceOryza sativat0
- Material
- PT1e0
- Treatment
- salt stressede0
- Outcome
- total chlorophyll (TC) contentse0
- Direction
- degradede0
- Value
- 44.93%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chlorophyll b (Chlb) and total chlorophyll (TC) contents in salt stressed PT1 were significantly degraded for 61.76% and 44.93%, respectively”
t0“rice”
Claim · model-written summary
Chlorophyll degradation was associated with reduced net photosynthetic rate in PT1.
- Taxon
- riceOryza sativat0
- Material
- PT1e1
- Outcome
- net photosynthetic rate (Pn)e0
- Qualifier
- Chlorophyll b (Chlb) and total chlorophyll (TC) contentse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“leading to reduce net photosynthetic rate (Pn)”
e1“Chlorophyll b (Chlb) and total chlorophyll (TC) contents in salt stressed PT1 were significantly degraded”
t0“rice”
Claim · model-written summary
PT1 starch metabolism and sugar accumulation were unrelated to salt tolerance.
- Taxon
- riceOryza sativat0
- Material
- PT1e0
- Outcome
- salt tolerant abilitye0
- Qualifier
- starch metabolism and sugar accumulatione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The starch metabolism and sugar accumulation in PT1 were clearly unrelated with salt tolerant ability.”
t0“rice”
Claim · model-written summary
Authors propose starch degradation, photosynthesis and sugar accumulation as HJ salt-defense mechanisms preserving productivity.
- Taxon
- riceOryza sativat0
- Material
- HJe0
- Outcome
- maintain productivitye0
- Qualifier
- starch degradation, photosynthetic abilities and sugar accumulatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the starch degradation, photosynthetic abilities and sugar accumulation in salt stressed HJ may play a key role as osmoregulation salt defense mechanism, leading to maintain productivity when subjected to salt stress”
t0“rice”
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