Biochar decreases cadmium uptake in indica and japonica rice (Oryza sativa L.): Roles of soil properties, iron plaque, cadmium transporter genes and rhizobacteria

被引:6
|
作者
Xu, Meiling [1 ]
Ren, Meiling [1 ]
Yao, Yu [1 ]
Liu, Qi [2 ]
Che, Jing [3 ]
Wang, Xiaozhi [1 ,4 ]
Xu, Qiao [1 ,5 ]
机构
[1] Yangzhou Univ, Coll Environm Sci & Engn, Yangzhou 225127, Peoples R China
[2] Nanjing Forestry Univ, Coll Forestry, Coinnovat Ctr Sustainable Forestry Southern China, Nanjing 210037, Peoples R China
[3] Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, Nanjing 210008, Peoples R China
[4] Nanjing Agr Univ, Jiangsu Collaborat Innovat Ctr Solid Organ Waste R, Nanjing 210095, Peoples R China
[5] La Trobe Univ, Ctr AgriBiosci, Dept Anim Plant & Soil Sci, Melbourne, Vic 3086, Australia
基金
中国国家自然科学基金;
关键词
Biochar; Cadmium; Gene; Iron plaque; Microbial community; BIOAVAILABILITY; METALS; OSLCT1; PH;
D O I
10.1016/j.jhazmat.2024.135402
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Biochar is an effective and economical strategy for in situ soil cadmium (Cd) remediation. It is essential to comprehensively investigate how biochar mitigates Cd uptake of the main rice subspecies. A pot experiment was established via adding corn stalk biochar into Cd-contaminated soil growing indica Yangdao 6 (YD) and japonica Nangeng 9108 (9108). 9108 had lower shoot biomass (-17.9%) but higher root biomass (+14.4%) and shoot Cd concentration (+29.4%) than YD. Biochar decreased soil available Cd by 25.2% and shoot Cd concentration by 13.6% through the liming and passivation effects. Biochar also favored Cd mitigation by recruiting Fe reducer, Cd remover and plant growth-promoting rhizobacteria (e.g. Bacteroides, Deferrisomatota, Bacillus and Allorhizobium). Besides, biochar reduced Cd uptake by stimulating iron plaques formation for 9108. Moreover, biochar did not reduce Cd uptake by inhibiting Cd transporter genes' expressions and it increased OsHMA2 expression in YD. In conclusion, biochar had great capacity in mitigating Cd pollution and rice subspecies responded differently to biochar in iron plaque formation and Cd transporter genes. The research established a comprehensive understanding of the mechanisms underlying Cd mitigation by biochar and helped to breed low Cd-accumulated rice cultivars to safeguard rice production.
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页数:11
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