Biofertilizer-induced response to cadmium accumulation in Oryza sativa L. grains involving exogenous organic matter and soil bacterial community structure
| Autor: | Baofeng Zhang, Jin Yu, Qi Lin, Chaofeng Shen, Liping Lou, Wei-Hua Mao, Junqiao Chen |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Health
Toxicology and Mutagenesis Biofertilizer 0211 other engineering and technologies 02 engineering and technology 010501 environmental sciences 01 natural sciences complex mixtures Environmental pollution Soil Soil pH Soil Pollutants Organic matter GE1-350 Fertilizers 0105 earth and related environmental sciences chemistry.chemical_classification Soil predominant microbes 021110 strategic defence & security studies Oryza sativa High-throughput sequencing Bacteria Chemistry Public Health Environmental and Occupational Health food and beverages Oryza General Medicine Soil type Pollution Environmental sciences Horticulture Heavy metals TD172-193.5 Loam Soil water Rice Plant Structures Organic fertilizer Cadmium |
| Zdroj: | Ecotoxicology and Environmental Safety, Vol 211, Iss, Pp 111952-(2021) |
| ISSN: | 0147-6513 |
| Popis: | The accumulation of cadmium (Cd) in Oryza sativa L., the world’s most significant staple crop, is a health threat to millions of people. The objective of this study was to evaluate the effectiveness of commercially available biofertilizers (with high (BF2) and low organic matter (OM) content (BF1)) on Cd accumulation in two types of soils and to determine the bacterial community responses by high-throughput sequencing. The study was conducted in the form of pot experiment in greenhouse in 2018. Four treatments were set: BF1, BF2, organic fertilizer (OF), and control (CK) and the amendments were applied before the rice cultivation. The results showed that the addition of biofertilizers immobilized or mobilized Cd in soils, depending on the soil type and the OM content in biofertilizers. The exogenous OM in biofertilizers was the driving factor for the difference in pH and Cd accumulation in rice grains. The application of biofertilizers with high OM content was effective in reducing Cd accumulation in the rice grains (19.7% lower than CK) by significantly increasing soil pH (from 6.02 to 6.67) in acid silt loam soil (TZ). The consumption of acid fermentation products by soil chemoorganotrophs and the complexation of organic anions in the biofertilizer treatment tended to buffer the pH drop in the drainage and decrease the Cd availability. However, in the weak acid silty clay loam soil (SX), the addition of biofertilizer with high OM significantly increased Cd accumulation in rice grains (21.9% higher than CK), probably owing to the release of acid substances, resulting from the significant increase of the predominant bacteria Chloroflexi. The addition of biofertilizer with low OM content did not significantly change Cd accumulation in rice grains or affect the soil microbial structures in both soils. In conclusion, the effects of biofertilizer on rice Cd accumulation were related to the OM content and soil bacterial community. Biofertilizers with high organic matter may not be suitable for amendments in the paddy soils with high clay content to reduce Cd accumulation in rice grains. |
| Databáze: | OpenAIRE |
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