Abstract
To understand the physiological and molecular mechanisms underlying seedling salt tolerance in rice (Oryza sativa L.), the phenotypic, metabolic, and transcriptome responses of two related rice genotypes, IR64 and PL177, with contrasting salt tolerance were characterized under salt stress and salt+abscisic acid (ABA) conditions. PL177 showed significantly less salt damage, lower Na(+)/K(+) ratios in shoots, and Na(+) translocation from roots to shoots, attributed largely to better salt exclusion from its roots and salt compartmentation of its shoots. Exogenous ABA was able to enhance the salt tolerance of IR64 by selectively decreasing accumulation of Na(+) in its roots and increasing K(+) in its shoots. Salt stress induced general and organ-specific increases of many primary metabolites in both rice genotypes, with strong accumulation of several sugars plus proline in shoots and allantoin in roots. This was due primarily to ABA-mediated repression of genes for degradation of these metabolites under salt. In PL177, salt specifically up-regulated genes involved in several pathways underlying salt tolerance, including ABA-mediated cellular lipid and fatty acid metabolic processes and cytoplasmic transport, sequestration by vacuoles, detoxification and cell-wall remodeling in shoots, and oxidation-reduction reactions in roots. Combined genetic and transcriptomic evidence shortlisted relatively few candidate genes for improved salt tolerance in PL177.
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Claims 12
Claim · model-written summary
PL177 had less salt damage than IR64.
- Taxon
- rice
Oryza sativat0 - Material
- PL177e0
- Outcome
- salt damagee0
- Direction
- lesse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“PL177 showed significantly less salt damage”
Claim · model-written summary
PL177 had lower shoot Na(+)/K(+) ratios.
- Taxon
- riceOryza sativat0
- Material
- PL177e0
- Organ / stage
- shootse0
- Outcome
- Na(+)/K(+) ratiose0
- Direction
- lowere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“PL177 showed significantly less salt damage, lower Na(+)/K(+) ratios in shoots”
Claim · model-written summary
PL177 showed reduced root-to-shoot Na(+) translocation.
- Taxon
- riceOryza sativat0
- Outcome
- Na(+) translocation from roots to shootse0
- Direction
- decreaseinferrede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“Na(+) translocation from roots to shoots, attributed largely to better salt exclusion from its roots”
Claim · model-written summary
ABA enhanced IR64 salt tolerance.
- Taxon
- riceOryza sativat0
- Material
- IR64e0
- Treatment
- Exogenous ABAe0
- Outcome
- salt tolerancee0
- Direction
- enhancee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“Exogenous ABA was able to enhance the salt tolerance of IR64”
Claim · model-written summary
ABA reduced root Na(+) accumulation in IR64.
- Taxon
- riceOryza sativat0
- Material
- IR64e0
- Organ / stage
- rootse0
- Treatment
- Exogenous ABAe0
- Outcome
- accumulation of Na(+)e0
- Direction
- decreasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“Exogenous ABA was able to enhance the salt tolerance of IR64 by selectively decreasing accumulation of Na(+) in its roots”
Claim · model-written summary
ABA increased shoot K(+) in IR64.
- Taxon
- riceOryza sativat0
- Material
- IR64e0
- Organ / stage
- shootse0
- Treatment
- Exogenous ABAe0
- Outcome
- K(+)e0
- Direction
- increasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“Exogenous ABA was able to enhance the salt tolerance of IR64 by selectively decreasing accumulation of Na(+) in its roots and increasing K(+) in its shoots”
Claim · model-written summary
Salt raised many primary metabolites in both genotypes.
- Taxon
- riceOryza sativat0
- Treatment
- Salt stresse0
- Outcome
- many primary metabolitese0
- Direction
- increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“Salt stress induced general and organ-specific increases of many primary metabolites in both rice genotypes”
Claim · model-written summary
Salt induced strong shoot accumulation of sugars and proline.
- Taxon
- riceOryza sativat0
- Organ / stage
- shootse0
- Outcome
- several sugars plus prolinee0
- Direction
- accumulatione0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“strong accumulation of several sugars plus proline in shoots”
Claim · model-written summary
Salt induced allantoin accumulation in roots.
- Taxon
- riceOryza sativat0
- Organ / stage
- rootse0
- Outcome
- allantoine0
- Direction
- accumulatione0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“strong accumulation of several sugars plus proline in shoots and allantoin in roots”
Claim · model-written summary
ABA-mediated repression of metabolite-degradation genes explains metabolite accumulation under salt.
- Taxon
- riceOryza sativat0
- Gene
- genes for degradation of these metabolitese0
- Outcome
- degradation of these metabolitese0
- Qualifier
- under salte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“ABA-mediated repression of genes for degradation of these metabolites under salt”
Claim · model-written summary
Salt upregulated tolerance-related genes in PL177, including lipid metabolism, transport and detoxification pathways.
- Taxon
- riceOryza sativat0
- Material
- PL177e0
- Gene
- genes involved in several pathways underlying salt tolerancee0
- Outcome
- genes involved in several pathways underlying salt tolerancee0
- Direction
- up-regulatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“In PL177, salt specifically up-regulated genes involved in several pathways underlying salt tolerance, including ABA-mediated cellular lipid and fatty acid metabolic processes and cytoplasmic transport, sequestration by vacuoles, detoxification and cell-wall remodeling in shoots, and oxidation-reduction reactions in roots”
Claim · model-written summary
Combined genetic and transcriptomic evidence shortlisted candidate genes for improved PL177 salt tolerance.
- Taxon
- riceOryza sativat0
- Material
- PL177e0
- Outcome
- candidate genes for improved salt tolerancee0
- Value
- relatively fewe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“Combined genetic and transcriptomic evidence shortlisted relatively few candidate genes for improved salt tolerance in PL177”
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See all 25 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.