Promotion of rice seedlings growth and enhancement of cadmium immobilization under cadmium stress with two types of organic fertilizer

Cadmium (Cd)-contaminated soil poses a severe threat to crop production and human health, while also resulting in a waste of land resources. In this study, two types of organic fertilizer (ZCK: Low-content available iron; Z2: High-content available iron) were applied to Cd-contaminated soil for rice...

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Bibliographic Details
Published in:Environmental pollution (1987) 2024-04, Vol.346, p.123619-123619, Article 123619
Main Authors: Chen, Liang, Ma, Jingjing, Xiang, Sha, Jiang, Lihong, Wang, Ying, Li, Zhihuan, Liu, Xianjing, Duan, Shuyang, Luo, Yuan, Xiao, Yunhua
Format: Article
Language:English
Subjects:
Cadmium - analysis
Cd uptake and efflux
Fertilizers - analysis
Gene prediction
Humans
Iron - pharmacology
Microbial community
Migration and transformation
Oryza
Seedlings - chemistry
Soil - chemistry
Soil Pollutants - analysis
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Summary:Cadmium (Cd)-contaminated soil poses a severe threat to crop production and human health, while also resulting in a waste of land resources. In this study, two types of organic fertilizer (ZCK: Low-content available iron; Z2: High-content available iron) were applied to Cd-contaminated soil for rice cultivation, and the effects of the fertilizer on rice growth and Cd passivation were investigated in conjunction with soil microbial analysis. Results showed that Z2 could alter the composition, structure, and diversity of microbial communities, as well as enhance the complexity and stability of the microbial network. Both 2% and 5% Z2 significantly increased the fresh weight and dry weight of rice plants while suppressing Cd absorption. The 2% Z2 exhibited the best Cd passivation effect. Gene predictions suggested that Z2 may promote plant growth by regulating microbial production of organic acids that dissolve phosphorus and potassium. Furthermore, it is suggested that Z2 may facilitate the absorption and immobilization of soil cadmium through the regulation of microbial cadmium efflux and uptake systems, as well as via the secretion of extracellular polysaccharides. In summary, Z2 can promote rice growth, suppress Cd absorption by rice, and passivate soil Cd by regulating soil microbial communities. [Display omitted] •Organic fertilizers ZCK and Z2 can promote rice growth and inhibit Cd absorption.•Both ZCK and Z2 can passivate soil cadmium, and 2% Z2 has the best effect.•Microbial communities participate in cadmium passivation by regulating Cd-related genes.
ISSN:0269-7491
1873-6424
DOI:10.1016/j.envpol.2024.123619