Abstract
Soil Cadmium (Cd) pollution has become a serious environmental problem. Silicon (Si) plays key roles in alleviating Cd toxicity in plants. However, the effects of Si on mitigation of Cd toxicity and accumulation of Cd by hyperaccumulators are largely unknown. This study was conducted to investigate the effect of Si on Cd accumulation and the physiological characteristics of Cd hyperaccumulator Sedum alfredii Hance under Cd stress. Results showed that, exogenous Si application promoted the biomass, Cd translocation and concentration of S. alfredii , with an increased rate of 21.74-52.17% for shoot biomass, and 412.39-621.00% for Cd accumulation. Moreover, Si alleviated Cd toxicity by: (i) increasing chlorophyll contents, (ii) improving antioxidant enzymes, (iii) enhancing cell wall components (lignin, cellulose, hemicellulose and pectin), (iv) raising the secretion of organic acids (oxalic acid, tartaric acid and L-malic acid). The RT-PCR analysis of genes that involved in Cd detoxification showed that the expression of SaNramp3 , SaNramp6 , SaHMA2 and SaHMA4 in roots were significantly decreased by 11.46-28.23%, 6.61-65.19%, 38.47-80.87%, 44.80-69.85% and 33.96-71.70% in the Si treatments, while Si significantly increased the expression of SaCAD . This study expanded understanding on the role of Si in phytoextraction and provided a feasible strategy for assisting phytoextraction Cd by S. alfredii . In summary, Si facilitated the Cd phytoextraction of S. alfredii by promoting plant growth and enhancing the resistance of plants to Cd.
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Claims 13
Claim · model-written summary
Exogenous Si application increased shoot biomass of Sedum alfredii by 21.74-52.17%.
- Taxon
- Sedum alfredii HanceSedum alfrediie1
- Treatment
- exogenous Si applicatione3
- Outcome
- shoot biomasse2
- Direction
- increasede2
- Value
- 21.74-52.17%e2
Not reportedComparator
Verbatim
e1“Cd hyperaccumulator Sedum alfredii Hance”
e2“with an increased rate of 21.74-52.17% for shoot biomass”
e3“exogenous Si application promoted the biomass”
Claim · model-written summary
Exogenous Si increased Cd accumulation in Sedum alfredii by 412.39-621.00%.
- Taxon
- Sedum alfredii HanceSedum alfrediie1
- Treatment
- exogenous Si applicatione3
- Outcome
- Cd accumulatione4
- Direction
- increaseinferrede4
- Value
- 412.39-621.00%e4
Not reportedComparator
Verbatim
e1“Cd hyperaccumulator Sedum alfredii Hance”
e3“exogenous Si application promoted the biomass”
e4“412.39-621.00% for Cd accumulation”
Claim · model-written summary
Exogenous Si promoted Cd translocation and concentration in Sedum alfredii.
- Taxon
- Sedum alfredii HanceSedum alfrediie1
- Treatment
- exogenous Si applicatione3
- Outcome
- Cd translocation and concentratione5
- Direction
- promotede5
Not reportedComparator
Verbatim
e1“Cd hyperaccumulator Sedum alfredii Hance”
e3“exogenous Si application promoted the biomass”
e5“promoted the biomass, Cd translocation and concentration of S. alfredii”
Claim · model-written summary
Si increased chlorophyll contents in Sedum alfredii under Cd stress.
- Taxon
- Sedum alfredii HanceSedum alfrediie1
- Treatment
- Sie2
- Outcome
- chlorophyll contentse2
- Direction
- increasinge2
Not reportedComparator
Verbatim
e1“Cd hyperaccumulator Sedum alfredii Hance”
e2“Si alleviated Cd toxicity by: (i) increasing chlorophyll contents”
Claim · model-written summary
Si improved antioxidant enzymes in Sedum alfredii under Cd stress.
- Taxon
- Sedum alfredii HanceSedum alfrediie1
- Treatment
- Sie2
- Outcome
- antioxidant enzymese3
- Direction
- improvinge3
Not reportedComparator
Verbatim
e1“Cd hyperaccumulator Sedum alfredii Hance”
e2“Si alleviated Cd toxicity by: (i) increasing chlorophyll contents”
e3“(ii) improving antioxidant enzymes”
Claim · model-written summary
Si enhanced cell wall components (lignin, cellulose, hemicellulose and pectin) in Sedum alfredii under Cd stress.
- Taxon
- Sedum alfredii HanceSedum alfrediie1
- Treatment
- Sie2
- Outcome
- cell wall componentse3
- Direction
- enhancinge3
Not reportedComparator
Verbatim
e1“Cd hyperaccumulator Sedum alfredii Hance”
e2“Si alleviated Cd toxicity by: (i) increasing chlorophyll contents”
e3“(iii) enhancing cell wall components (lignin, cellulose, hemicellulose and pectin)”
Claim · model-written summary
Si raised the secretion of organic acids (oxalic, tartaric and L-malic acid) in Sedum alfredii under Cd stress.
- Taxon
- Sedum alfredii HanceSedum alfrediie1
- Treatment
- Sie2
- Outcome
- secretion of organic acidse3
- Direction
- raisinge3
Not reportedComparator
Verbatim
e1“Cd hyperaccumulator Sedum alfredii Hance”
e2“Si alleviated Cd toxicity by: (i) increasing chlorophyll contents”
e3“(iv) raising the secretion of organic acids (oxalic acid, tartaric acid and L-malic acid)”
Claim · model-written summary
Si decreased expression of SaNramp3 in roots of Sedum alfredii.
- Taxon
- Sedum alfredii HanceSedum alfrediie1
- Organ / stage
- rootse2
- Treatment
- Si treatmentse2
- Gene
- SaNramp3e2
- Outcome
- expressione2
- Direction
- significantly decreasede2
Not reportedComparator
Verbatim
e1“Cd hyperaccumulator Sedum alfredii Hance”
e2“the expression of SaNramp3 , SaNramp6 , SaHMA2 and SaHMA4 in roots were significantly decreased by 11.46-28.23%, 6.61-65.19%, 38.47-80.87%, 44.80-69.85% and 33.96-71.70% in the Si treatments”
Claim · model-written summary
Si decreased expression of SaNramp6 in roots of Sedum alfredii.
- Taxon
- Sedum alfredii HanceSedum alfrediie1
- Organ / stage
- rootse2
- Treatment
- Si treatmentse2
- Gene
- SaNramp6e2
- Outcome
- expressione2
- Direction
- significantly decreasede2
Not reportedComparator
Verbatim
e1“Cd hyperaccumulator Sedum alfredii Hance”
e2“the expression of SaNramp3 , SaNramp6 , SaHMA2 and SaHMA4 in roots were significantly decreased by 11.46-28.23%, 6.61-65.19%, 38.47-80.87%, 44.80-69.85% and 33.96-71.70% in the Si treatments”
Claim · model-written summary
Si decreased expression of SaHMA2 in roots of Sedum alfredii.
- Taxon
- Sedum alfredii HanceSedum alfrediie1
- Organ / stage
- rootse2
- Treatment
- Si treatmentse2
- Gene
- SaHMA2e2
- Outcome
- expressione2
- Direction
- significantly decreasede2
Not reportedComparator
Verbatim
e1“Cd hyperaccumulator Sedum alfredii Hance”
e2“the expression of SaNramp3 , SaNramp6 , SaHMA2 and SaHMA4 in roots were significantly decreased by 11.46-28.23%, 6.61-65.19%, 38.47-80.87%, 44.80-69.85% and 33.96-71.70% in the Si treatments”
Claim · model-written summary
Si decreased expression of SaHMA4 in roots of Sedum alfredii.
- Taxon
- Sedum alfredii HanceSedum alfrediie1
- Organ / stage
- rootse2
- Treatment
- Si treatmentse2
- Gene
- SaHMA4e2
- Outcome
- expressione2
- Direction
- significantly decreasede2
Not reportedComparator
Verbatim
e1“Cd hyperaccumulator Sedum alfredii Hance”
e2“the expression of SaNramp3 , SaNramp6 , SaHMA2 and SaHMA4 in roots were significantly decreased by 11.46-28.23%, 6.61-65.19%, 38.47-80.87%, 44.80-69.85% and 33.96-71.70% in the Si treatments”
Claim · model-written summary
Si significantly increased expression of SaCAD in Sedum alfredii.
- Taxon
- Sedum alfredii HanceSedum alfrediie1
- Treatment
- Sie2
- Gene
- SaCADe2
- Outcome
- expressione2
- Direction
- significantly increasede2
Not reportedComparator
Verbatim
e1“Cd hyperaccumulator Sedum alfredii Hance”
e2“while Si significantly increased the expression of SaCAD”
Claim · model-written summary
Si facilitated Cd phytoextraction by Sedum alfredii by promoting plant growth and enhancing plant resistance to Cd.
- Taxon
- S. alfrediiSedum alfrediie1
- Treatment
- Sie1
- Outcome
- Cd phytoextractione1
- Direction
- facilitatede1
Not reportedComparator
Verbatim
e1“Si facilitated the Cd phytoextraction of S. alfredii by promoting plant growth and enhancing the resistance of plants to Cd”
The same questions in other papers
silicon atom · nutrient: content · Sedum alfrediiResults agree
1 paper in the same direction as this paper
- positive
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.