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Silver nanoparticles deteriorate the mutual interaction between maize (Zea mays L.) and arbuscular mycorrhizal fungi: a soil microcosm study

文献类型： 外文期刊

作者： Cao, Jiling 1 ; Feng, Youzhi 1 ; He, Shiying 5 ; Lin, Xiangui 1 ;

作者机构： 1.Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, Nanjing, Jiangsu, Peoples R China

2.Hong Kong Baptist Univ, Joint Open Lab Soil & Environm, Nanjing, Jiangsu, Peoples R China

3.Hong Kong Baptist Univ, Inst Soil Sci, Nanjing, Jiangsu, Peoples R China

4.Univ Chinese Acad Sci, Beijing, Peoples R China

5.Jiangsu Acad Agr Sci, Inst Agr Resources & Environm, Nanjing, Jiangsu, Peoples R China

关键词： Arbuscular mycorrhizal communities;Maize;Ag accumulation;Dissolved organic matter;Alkaline phosphatase activity

期刊名称：APPLIED SOIL ECOLOGY （ 影响因子：4.046； 五年影响因子：4.884 ）

ISSN： 0929-1393

年卷期： 2017 年 119 卷

页码：

收录情况： SCI

摘要： The effects of silver nanoparticles (AgNPs) on plants and soil microbial communities have been widely documented. However, the influence of AgNPs on plant growth and rhizospheric microbial communities, especially the important symbiotic microbes, such as arbuscular mycorrhizal (AM) fungi, remains under debate. In this study, a greenhouse pot experiment was established to investigate the responses of maize (Zea mays L.) growth and rhizospheric AM fungal assemblages to different application levels (0.025, 0.25 and 2.5 mg kg(-1)) of AgNPs or bulk Ag. The results indicated that 2.5 mg kg-1 of AgNPs significantly decreased (p < 0.05) plant biomass and dissolved organic carbon (DOC) content in rhizospheric soils compared to the control and bulk Ag conditions. Growth inhibition was associated with increased Ag accumulation in plant tissues and increased antioxidant enzyme activity. A similar toxicity for the AM fungal community was observed as a significant decrease (p < 0.05) in their diversity and remarkable variations in their structure, which were closely correlated with plant root biomass, soil soluble Ag and DOC content. Consequently, AgNPs caused a reduction in AM fungal growth and ecological function, characterized by a significantly decreased (p < 0.05) root mycorrhizal colonization rate, soil alkaline phosphatase activity, available phosphorus (P) content and P nutrition in plants. These results suggest that high concentrations of AgNPs can deteriorate the mutual interaction between plants and AM fungi and negatively influence the rhizospheric soil P cycling, both of which go against plant growth and soil fertility.

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