首页|Optimized silicon fertilization regime weakens cadmium translocation and increases its biotransformation in rice tissues
Optimized silicon fertilization regime weakens cadmium translocation and increases its biotransformation in rice tissues
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In acidic paddy fields of South China,rice(Oryza sativa L.)faces the dual challenges of cadmium(Cd)tox-icity and silicon(Si)deficiency.Although previous studies have highlighted the functions of Si application timing and strategies in mitigating Cd-stressed rice,the precise mechanisms underlying the health restoration of Cd-toxic rice and the assurance of grain safety remain elusive.This study explored Cd translocation and detoxification in the shoots of rice regulated by various Si fertilization regimes:Si(T)(all Si added before transplanting),Si(J)(all Si added at jointing),and Si(TJ)(half Si added both before transplanting and at jointing).The findings revealed that the regime of Si(TJ)was more beneficial to rice health and grain safety than Si(T)and Si(J).The osmotic regulators such as proline,soluble sugars,and soluble proteins were significantly boosted by Si(TJ)compared to other Si treatments,and which enhanced membrane integrity,balanced intracellular pH,and increased Cd tolerance of rice.Furthermore,Si(TJ)was more effective than Si(T)and Si(J)on the Cd sequestration in the cell wall,Cd bio-passivation,and the down-regulated expression of the Cd transport genes.The concentrations of Cd in the xylem and phloem treated with Si(TJ)were reduced significantly.Additionally,Si(TJ)facilitated much more Cd bound with the outer layer proteins of grains,and promoted Cd chelation and complex-ation by phytic acid,phenolics,and flavonoids.Overall,Si(TJ)outperformed Si(T)and Si(J)in harmonizing the phycological processes,inhibiting Cd translocation,and enhancing Cd detoxification in rice plant.Thereby the split Si application strategy offers potential for reducing Cd toxicity in rice grain.
CadmiumSiliconGrowth stagesTranslocation and accumulationRiceSafe production
Bogui Pan、Yixia Cai、Kunzheng Cai、Jihui Tian、Wei Wang
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College of Natural Resources and Environment,South China Agricultural University,Guangzhou 510642,Guangdong,China
Guangdong Provincial Key Laboratory of Eco-Circular Agriculture,Guangzhou 510642,Guangdong,China
Key Laboratory of Tropical Agricultural Environment in South China,Ministry of Agriculture and Rural Affairs,Guangzhou 510642,Guangdong,China
College of Agriculture,South China Agricultural University,Guangzhou 510642,Guangdong,China
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Science and Technology Planning Program of Guangdong ProvinceScience and Technology Planning Program of Guangdong ProvinceOpen Foundation of Key Laboratory for Agricultural Environment,Ministry of Agriculture and Rural Affairs,P.R.China
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