Abstract
Rice is a relatively salt-sensitive crop with the reproductive and seedling stages being the most sensitive. Two separate experiments were conducted to isolate potential determinants of salinity tolerance and to investigate the possibility of modulating salt tolerance by exogenous ascorbic acid (AsA) application. Rice plants were imposed to salinity (EC= 10.0 dS m-1) both at the seedling and reproductive phases of growth. Salinity at the seedling stage resulted a sharp decline in shoot and root growth related traits including leaf chlorophyll content, while hydrogen peroxide (H2O2) and malondialdehyde (MDA) levels increased. Plants experienced with salinity at the reproductive phases of growth showed a significant reduction in yield attributing traits while the tissue levels of H2O2 increased. Exogenous AsA application reversed the negative impact of salt stress, modulating the root and shoots growth and yield related traits and lowering H2O2 and MDA levels. FL-478 was identified as the most tolerant genotype at the seedling stage, with Binadhan-10 being the most tolerant at the reproductive stage. Grain yield panicle-1 significantly and positively corrected with number of filled grains panicle-1, panicle length, plant height, and spikelet fertility, and negatively correlated with H2O2 levels. Stress tolerance indices clearly separated the tolerant and susceptible genotypes. A principal component analysis revealed that the first two components explained 87% of the total variation among the genotypes. Breeding efforts could therefore to undertake for developing salinity tolerance by manipulating endogenous AsA content in rice.
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Claims 15
Claim · model-written summary
Seedling-stage salinity reduced shoot and root growth related traits.
- Taxon
- rice
Oryza sativat0 - Organ / stage
- seedling stagee0
- Treatment
- Salinitye0
- Outcome
- shoot and root growth related traitse0
- Direction
- declinee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salinity at the seedling stage resulted a sharp decline in shoot and root growth related traits including leaf chlorophyll content, while hydrogen peroxide (H2O2) and malondialdehyde (MDA) levels increased”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
Seedling-stage salinity reduced leaf chlorophyll content.
- Taxon
- riceOryza sativat0
- Organ / stage
- seedling stagee0
- Treatment
- Salinitye0
- Outcome
- leaf chlorophyll contente0
- Direction
- declinee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salinity at the seedling stage resulted a sharp decline in shoot and root growth related traits including leaf chlorophyll content, while hydrogen peroxide (H2O2) and malondialdehyde (MDA) levels increased”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
Seedling-stage salinity increased hydrogen peroxide (H2O2).
- Taxon
- riceOryza sativat0
- Organ / stage
- seedling stagee0
- Treatment
- Salinitye0
- Outcome
- hydrogen peroxide (H2O2)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salinity at the seedling stage resulted a sharp decline in shoot and root growth related traits including leaf chlorophyll content, while hydrogen peroxide (H2O2) and malondialdehyde (MDA) levels increased”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
Seedling-stage salinity increased malondialdehyde (MDA).
- Taxon
- riceOryza sativat0
- Organ / stage
- seedling stagee0
- Treatment
- Salinitye0
- Outcome
- malondialdehyde (MDA)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salinity at the seedling stage resulted a sharp decline in shoot and root growth related traits including leaf chlorophyll content, while hydrogen peroxide (H2O2) and malondialdehyde (MDA) levels increased”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
Reproductive-stage salinity reduction yield attributing traits.
- Taxon
- riceOryza sativat0
- Organ / stage
- reproductive phases of growthe0
- Treatment
- salinitye0
- Outcome
- yield attributing traitse0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants experienced with salinity at the reproductive phases of growth showed a significant reduction in yield attributing traits while the tissue levels of H2O2 increased”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
Reproductive-stage salinity increased tissue levels of H2O2.
- Taxon
- riceOryza sativat0
- Organ / stage
- reproductive phases of growthe0
- Treatment
- salinitye0
- Outcome
- tissue levels of H2O2e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants experienced with salinity at the reproductive phases of growth showed a significant reduction in yield attributing traits while the tissue levels of H2O2 increased”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
Exogenous AsA reversed the salt stress effect on root and shoots growth and yield related traits.
- Taxon
- riceOryza sativat0
- Treatment
- Exogenous AsA applicatione0
- Outcome
- root and shoots growth and yield related traitse0
- Direction
- reversede0
- Qualifier
- salt stresse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exogenous AsA application reversed the negative impact of salt stress, modulating the root and shoots growth and yield related traits and lowering H2O2 and MDA levels”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
Exogenous AsA reversed the salt stress effect on H2O2 and MDA levels.
- Taxon
- riceOryza sativat0
- Treatment
- Exogenous AsA applicatione0
- Outcome
- H2O2 and MDA levelse0
- Direction
- loweringe0
- Qualifier
- salt stresse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exogenous AsA application reversed the negative impact of salt stress, modulating the root and shoots growth and yield related traits and lowering H2O2 and MDA levels”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
FL-478 was the most tolerant genotype at the seedling stage.
- Taxon
- riceOryza sativat0
- Material
- FL-478e0
- Organ / stage
- seedling stagee0
- Outcome
- most tolerante0
- Direction
- most tolerante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“FL-478 was identified as the most tolerant genotype at the seedling stage”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
Binadhan-10 was the most tolerant genotype at the reproductive stage.
- Taxon
- riceOryza sativat0
- Material
- Binadhan-10e0
- Organ / stage
- reproductive stagee0
- Outcome
- most tolerante0
- Direction
- most tolerante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Binadhan-10 being the most tolerant at the reproductive stage”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
Grain yield per panicle was positively correlated with number of filled grains panicle-1, panicle length, plant height, and spikelet fertility.
- Taxon
- riceOryza sativat0
- Organ / stage
- paniclee0
- Outcome
- Grain yield panicle-1e0
- Direction
- positivelye0
- Qualifier
- number of filled grains panicle-1, panicle length, plant height, and spikelet fertilitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain yield panicle-1 significantly and positively corrected with number of filled grains panicle-1, panicle length, plant height, and spikelet fertility, and negatively correlated with H2O2 levels”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
Grain yield per panicle was negatively correlated with H2O2 levels.
- Taxon
- riceOryza sativat0
- Organ / stage
- paniclee0
- Outcome
- Grain yield panicle-1e0
- Direction
- negativelye0
- Qualifier
- H2O2 levelse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain yield panicle-1 significantly and positively corrected with number of filled grains panicle-1, panicle length, plant height, and spikelet fertility, and negatively correlated with H2O2 levels”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
Stress tolerance indices separated tolerant and susceptible genotypes.
- Taxon
- riceOryza sativat0
- Outcome
- separated the tolerant and susceptible genotypese0
- Comparator
- tolerant and susceptible genotypese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Stress tolerance indices clearly separated the tolerant and susceptible genotypes”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
The first two principal components explained 87% of genotype variation.
- Taxon
- riceOryza sativat0
- Outcome
- total variation among the genotypese0
- Value
- 87%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A principal component analysis revealed that the first two components explained 87% of the total variation among the genotypes”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
The authors propose breeding rice salinity tolerance by manipulating endogenous AsA content.
- Taxon
- riceOryza sativae0
- Outcome
- developing salinity tolerance by manipulating endogenous AsA contente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Breeding efforts could therefore to undertake for developing salinity tolerance by manipulating endogenous AsA content in rice”
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