Abstract
Silicon (Si) alleviates cadmium (Cd) toxicity and accumulation in a number of plant species, but the exact molecular mechanisms responsible for this effect are still poorly understood. Here, we investigated the effect of Si on Cd toxicity and accumulation in rice (Oryza sativa) by using two mutants (lsi1 and lsi2) defective in Si uptake and their wild types (WTs). Root elongation was decreased with increasing external Cd concentrations in both WTs and mutants, but Si did not show an alleviative effect on Cd toxicity in all lines. By contrast, the Cd concentration in both the shoots and roots was decreased by Si in the WTs, but not in the mutants. Furthermore, Si supply resulted in a decreased Cd concentration in the root cell sap and xylem sap in the WTs, but not in the mutants. Pre-treatment with Si also decreased Cd accumulation in the WTs, but not in the mutants. Silicon slightly decreased Cd accumulation in the cell wall of the roots. The expression level of OsNramp5 and OsHMA2 was down-regulated by Si in the WTs, but not in the mutants. These results indicate that the Si-decreased Cd accumulation was caused by down-regulating transporter genes involved in Cd uptake and translocation in rice.
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Claims 9
Claim · model-written summary
Root elongation fell as external cadmium concentration rose in wild types and mutants.
- Taxon
- rice
Oryza sativat0 - Material
- WTs and mutantse0
- Treatment
- external Cd concentrationse0
- Outcome
- Root elongatione0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root elongation was decreased with increasing external Cd concentrations in both WTs and mutants”
t0“rice”
Claim · model-written summary
Silicon did not alleviate cadmium toxicity in any line.
- Taxon
- riceOryza sativat0
- Treatment
- Sie0
- Outcome
- Cd toxicitye0
- Direction
- did not show an alleviative effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Si did not show an alleviative effect on Cd toxicity in all lines”
t0“rice”
Claim · model-written summary
Silicon decreased shoot and root cadmium concentration in wild types but not mutants.
- Taxon
- riceOryza sativat0
- Material
- WTse0
- Treatment
- Sie0
- Outcome
- Cd concentration in both the shoots and rootse0
- Direction
- decreasede0
- Comparator
- mutantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the Cd concentration in both the shoots and roots was decreased by Si in the WTs, but not in the mutants”
t0“rice”
Claim · model-written summary
Silicon decreased cadmium concentration in root cell sap and xylem sap of wild types but not mutants.
- Taxon
- riceOryza sativat0
- Material
- WTse0
- Treatment
- Si supplye0
- Outcome
- Cd concentration in the root cell sap and xylem sape0
- Direction
- decreasede0
- Comparator
- mutantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Si supply resulted in a decreased Cd concentration in the root cell sap and xylem sap in the WTs, but not in the mutants”
t0“rice”
Claim · model-written summary
Silicon pretreatment decreased cadmium accumulation in wild types but not mutants.
- Taxon
- riceOryza sativat0
- Material
- WTse0
- Treatment
- Pre-treatment with Sie0
- Outcome
- Cd accumulatione0
- Direction
- decreasede0
- Comparator
- mutantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pre-treatment with Si also decreased Cd accumulation in the WTs, but not in the mutants”
t0“rice”
Claim · model-written summary
Silicon slightly decreased root cell wall cadmium accumulation.
- Taxon
- riceOryza sativat0
- Treatment
- Silicone0
- Outcome
- Cd accumulation in the cell wall of the rootse0
- Direction
- decreasede0
- Qualifier
- slightlye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Silicon slightly decreased Cd accumulation in the cell wall of the roots”
t0“rice”
Claim · model-written summary
Silicon downregulated OsNramp5 expression in wild types but not mutants.
- Taxon
- riceOryza sativat0
- Treatment
- Sie0
- Gene
- OsNramp5e0
- Outcome
- expression level of OsNramp5e0
- Direction
- down-regulatede0
- Comparator
- mutantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The expression level of OsNramp5 and OsHMA2 was down-regulated by Si in the WTs, but not in the mutants”
t0“rice”
Claim · model-written summary
Silicon downregulated OsHMA2 expression in wild types but not mutants.
- Taxon
- riceOryza sativat0
- Treatment
- Sie0
- Gene
- OsHMA2e0
- Outcome
- expression level of OsNramp5 and OsHMA2e0
- Direction
- down-regulatede0
- Comparator
- mutantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The expression level of OsNramp5 and OsHMA2 was down-regulated by Si in the WTs, but not in the mutants”
t0“rice”
Claim · model-written summary
The authors attribute silicon reduced cadmium accumulation to downregulation of uptake and translocation transporter genes.
- Taxon
- riceOryza sativae0
- Gene
- transporter genese0
- Outcome
- Cd accumulatione0
- Qualifier
- down-regulating transporter genes involved in Cd uptake and translocatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Si-decreased Cd accumulation was caused by down-regulating transporter genes involved in Cd uptake and translocation in rice”
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