Abstract
Silicon (Si) treatment has been shown to reduce the toxicity and accumulation of lead (Pb) in many plants, including rice. The mechanisms responsible for this effect are poorly understood. We investigated the effects of Si treatment on Pb toxicity and accumulation in two rice mutants (lsi1 and lsi2) defective in Si uptake and in their wild types. Si did not alleviate Pb-induced inhibition of root elongation in short-term experiments, but reduced Pb accumulation in wild types, but not in mutants, in long-term experiments. Pre-treatment with Si reduced Pb concentration in xylem sap and Pb accumulation in wild types but not in mutants. In split-root experiments, Si treatment reduced Pb accumulation but did not alter Pb localization in roots. Si treatment suppressed the expression of many genes encoding proteins that may participate in Pb uptake and transport in the wild type, but not in the lsi1 mutant. These results indicate that Si accumulation in shoots is required to reduce Pb uptake in rice and that the effect is achieved via Si-induced suppression of genes encoding proteins involved in Pb uptake and/or transport.
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Claims 9
Claim · model-written summary
Si did not alleviate Pb-induced inhibition of rice root elongation in short-term experiments.
- Taxon
- rice
Oryza sativat0 - Treatment
- Sie1
- Compound
- Pbe1
- Outcome
- root elongatione1
- Direction
- did not alleviatee1
- Qualifier
- in short-term experimentse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“lead uptake in rice”
e1“Si did not alleviate Pb-induced inhibition of root elongation in short-term experiments”
Claim · model-written summary
Si reduced Pb accumulation in wild-type rice but not in mutants in long-term experiments.
- Taxon
- riceOryza sativat0
- Material
- wild typese2
- Treatment
- Sie1
- Compound
- Pbe2
- Outcome
- Pb accumulatione2
- Direction
- reducede2
- Qualifier
- but not in mutantse2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“lead uptake in rice”
e1“Si did not alleviate Pb-induced inhibition of root elongation in short-term experiments”
e2“but reduced Pb accumulation in wild types, but not in mutants, in long-term experiments”
Claim · model-written summary
Pre-treatment with Si reduced Pb concentration in xylem sap of rice.
- Taxon
- riceOryza sativat0
- Treatment
- Pre-treatment with Sie3
- Compound
- Pbe3
- Outcome
- Pb concentration in xylem sape3
- Direction
- reducede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“lead uptake in rice”
e3“Pre-treatment with Si reduced Pb concentration in xylem sap and Pb accumulation in wild types but not in mutants”
Claim · model-written summary
Pre-treatment with Si reduced Pb accumulation in wild-type rice but not in mutants.
- Taxon
- riceOryza sativat0
- Material
- wild typese3
- Treatment
- Pre-treatment with Sie3
- Compound
- Pbe3
- Outcome
- Pb accumulatione3
- Direction
- reducede3
- Qualifier
- but not in mutantse3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“lead uptake in rice”
e3“Pre-treatment with Si reduced Pb concentration in xylem sap and Pb accumulation in wild types but not in mutants”
Claim · model-written summary
In split-root experiments, Si treatment reduced Pb accumulation in rice.
- Taxon
- riceOryza sativat0
- Treatment
- Si treatmente4
- Outcome
- Pb accumulatione4
- Direction
- reducede4
- Qualifier
- In split-root experimentse4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“lead uptake in rice”
e4“In split-root experiments, Si treatment reduced Pb accumulation but did not alter Pb localization in roots”
Claim · model-written summary
In split-root experiments, Si treatment did not alter Pb localization in rice roots.
- Taxon
- riceOryza sativat0
- Organ / stage
- rootse4
- Treatment
- Si treatmente4
- Outcome
- Pb localizatione4
- Direction
- did not altere4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“lead uptake in rice”
e4“In split-root experiments, Si treatment reduced Pb accumulation but did not alter Pb localization in roots”
Claim · model-written summary
Si treatment suppressed expression of many genes encoding proteins for Pb uptake and transport in the wild type but not in the lsi1 mutant.
- Taxon
- riceOryza sativat0
- Material
- wild typee5
- Treatment
- Si treatmente5
- Gene
- genes encoding proteinse5
- Outcome
- expressione5
- Direction
- suppressede5
- Qualifier
- that may participate in Pb uptake and transporte5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“lead uptake in rice”
e5“Si treatment suppressed the expression of many genes encoding proteins that may participate in Pb uptake and transport in the wild type, but not in the lsi1 mutant”
Claim · model-written summary
Si accumulation in shoots is required to reduce Pb uptake in rice (author conclusion).
- Taxon
- riceOryza sativat0
- Treatment
- Si accumulation in shootse6
- Outcome
- reduce Pb uptakee6
- Direction
- reducee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“lead uptake in rice”
e6“These results indicate that Si accumulation in shoots is required to reduce Pb uptake in rice”
Claim · model-written summary
The reduction in Pb uptake is achieved via Si-induced suppression of genes encoding proteins involved in Pb uptake and/or transport (author interpretation).
- Taxon
- riceOryza sativat0
- Outcome
- Pb uptake and/or transporte7
- Qualifier
- Si-induced suppression of genes encoding proteins involved in Pb uptake and/or transporte7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“lead uptake in rice”
e7“the effect is achieved via Si-induced suppression of genes encoding proteins involved in Pb uptake and/or transport”
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See all 177 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.