Abstract
BACKGROUND AND AIMS: Aluminum (Al) toxicity is a major barrier to rice yield in acidic soils, yet the hormonal mechanisms underlying Al tolerance remain incompletely understood. Strigolactones (SLs) have recently been identified as key regulators of plant adaptation to abiotic stress, but their involvement in Al tolerance has not been clearly defined. METHODS: Using rice (Oryza sativa L.) seedlings, we investigated Al-induced changes in endogenous SL accumulation and examined the effects of pharmacological activation of SL signaling with the synthetic analog GR24 on root growth, Al accumulation, cell wall composition, gene expression and nitric oxide (NO) production under Al stress. KEY RESULTS: Al exposure rapidly stimulated endogenous SL accumulation in rice roots by approximately 10%. Activation of SL signaling by GR24 significantly alleviated Al-induced inhibition of root elongation by 20% and decreased Al content in root tips by 29%, respectively. GR24 treatment under Al stress altered root cell wall properties by decreasing hemicellulose- and pectin-associated Al sequestration and attenuated the transcriptional activation of key Al-responsive genes, including OsART1 (Oryza sativa ALUMINUM RESISTANCE TRANSCRIPTION FACTOR 1), citrate transporter genes OsFRDL2 and OsFRDL4 (Oryza sativa FRD3-LIKE PROTEIN 2/4) and the Al transporter gene OsNRAT1 (NRAMP ALUMINUM TRANSPORTER 1). Notably, GR24-enhanced Al tolerance was accompanied by elevated accumulation of NO in root tips, and disruption of NO signaling abolished the protective effects of GR24. CONCLUSIONS: These research confirm that strigolactone signaling plays a previously unrecognized role in rice Al tolerance by coordinating NO-dependent regulation of cell wall Al sequestration and Al-responsive gene expression. This study provides new insight into the hormonal control of plant adaptation to acidic soils.
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Claims 9
Claim · model-written summary
Al exposure increased endogenous strigolactone accumulation in rice roots by about 10%.
- Taxon
- rice
Oryza sativae0 - Organ / stage
- rootse0
- Treatment
- Al exposuree0
- Outcome
- endogenous SL accumulatione0
- Direction
- stimulatede0
- Value
- approximately 10%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Al exposure rapidly stimulated endogenous SL accumulation in rice roots by approximately 10%.”
Claim · model-written summary
GR24 alleviated Al-induced inhibition of rice root elongation by 20%.
- Taxon
- rice (Oryza sativa L.)Oryza sativat0
- Organ / stage
- roote0
- Treatment
- GR24e0
- Outcome
- Al-induced inhibition of root elongatione0
- Direction
- alleviatede0
- Value
- 20%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Activation of SL signaling by GR24 significantly alleviated Al-induced inhibition of root elongation by 20% and decreased Al content in root tips by 29%, respectively.”
t0“rice ( Oryza sativa L. )”
Claim · model-written summary
GR24 decreased Al content in rice root tips by 29%.
- Taxon
- riceOryza sativat0
- Organ / stage
- root tipse0
- Treatment
- GR24e0
- Outcome
- Al contente0
- Direction
- decreasede0
- Value
- 29%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Activation of SL signaling by GR24 significantly alleviated Al-induced inhibition of root elongation by 20% and decreased Al content in root tips by 29%, respectively.”
t0“rice ( Oryza sativa L. )”
Claim · model-written summary
GR24 decreased hemicellulose- and pectin-associated Al sequestration under Al stress.
- Taxon
- riceOryza sativat0
- Organ / stage
- root cell walle0
- Treatment
- GR24 treatment under Al stresse0
- Outcome
- hemicellulose- and pectin-associated Al sequestratione0
- Direction
- decreasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“GR24 treatment under Al stress altered root cell wall properties by decreasing hemicellulose- and pectin-associated Al sequestration”
t0“rice ( Oryza sativa L. )”
Claim · model-written summary
GR24 attenuated transcriptional activation of OsART1 under Al stress.
- Taxon
- riceOryza sativat0
- Treatment
- GR24e1
- Gene
- OsART1e0
- Outcome
- transcriptional activatione0
- Direction
- attenuatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“attenuated the transcriptional activation of key Al-responsive genes, including OsART1 (Oryza sativa ALUMINUM RESISTANCE TRANSCRIPTION FACTOR 1), citrate transporter genes OsFRDL2 and OsFRDL4 (Oryza sativa FRD3-LIKE PROTEIN 2/4) and the Al transporter gene OsNRAT1 (NRAMP ALUMINUM TRANSPORTER 1).”
t0“rice ( Oryza sativa L. )”
e1“GR24 treatment under Al stress”
Claim · model-written summary
GR24 attenuated transcriptional activation of OsFRDL2 and OsFRDL4 under Al stress.
- Taxon
- riceOryza sativat0
- Treatment
- GR24e1
- Gene
- OsFRDL2 and OsFRDL4e0
- Outcome
- transcriptional activatione0
- Direction
- attenuatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“attenuated the transcriptional activation of key Al-responsive genes, including OsART1 (Oryza sativa ALUMINUM RESISTANCE TRANSCRIPTION FACTOR 1), citrate transporter genes OsFRDL2 and OsFRDL4 (Oryza sativa FRD3-LIKE PROTEIN 2/4) and the Al transporter gene OsNRAT1 (NRAMP ALUMINUM TRANSPORTER 1).”
t0“rice ( Oryza sativa L. )”
e1“GR24 treatment under Al stress”
Claim · model-written summary
GR24 attenuated transcriptional activation of OsNRAT1 under Al stress.
- Taxon
- riceOryza sativat0
- Treatment
- GR24e1
- Gene
- OsNRAT1e0
- Outcome
- transcriptional activatione0
- Direction
- attenuatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“attenuated the transcriptional activation of key Al-responsive genes, including OsART1 (Oryza sativa ALUMINUM RESISTANCE TRANSCRIPTION FACTOR 1), citrate transporter genes OsFRDL2 and OsFRDL4 (Oryza sativa FRD3-LIKE PROTEIN 2/4) and the Al transporter gene OsNRAT1 (NRAMP ALUMINUM TRANSPORTER 1).”
t0“rice ( Oryza sativa L. )”
e1“GR24 treatment under Al stress”
Claim · model-written summary
GR24-enhanced aluminium tolerance was accompanied by elevated nitric oxide in rice root tips.
- Taxon
- riceOryza sativat0
- Organ / stage
- root tipse0
- Treatment
- GR24e0
- Outcome
- accumulation of NOe0
- Direction
- elevatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“GR24-enhanced Al tolerance was accompanied by elevated accumulation of NO in root tips”
t0“rice ( Oryza sativa L. )”
Claim · model-written summary
Disrupting nitric oxide signaling abolished the protective effect of GR24 in rice.
- Taxon
- riceOryza sativat0
- Treatment
- disruption of NO signalinge0
- Outcome
- protective effects of GR24e0
- Direction
- abolishede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“disruption of NO signaling abolished the protective effects of GR24”
t0“rice ( Oryza sativa L. )”
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See all 21 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.