Nano-molybdenum alters microbial community structure and enhances soil-plant-microbe synergy in arsenic-stressed systems
文献类型： 外文期刊
第一作者： Riaz, Muhammad
作者： Riaz, Muhammad;Sattar, Muqadas;Yan, Lei;Ali, Qurban;Xia, Hao
作者机构：
关键词： Arsenic; Molybdenum nanoparticles; Maize; Nitrogen assimilation; Soil microbial diversity
期刊名称：ENVIRONMENTAL TECHNOLOGY & INNOVATION （ 影响因子：7.1； 五年影响因子：7.1 ）
ISSN： 2352-1864
年卷期： 2025 年 40 卷
页码：
收录情况： SCI
摘要： Arsenic (As) contamination in agricultural soils impairs plant growth and pose a serious threat to crop productivity and food safety. This study investigated the potential of molybdenum nanoparticles (MoNPs) to alleviate As-induced toxicity in maize seedlings. Under arsenic stress, maize growth was significantly impaired, with shoot length, fresh weight, and dry weight reduced. MoNP supplementation markedly reversed these effects, MoNPs maintained nitrogen metabolism under As stress by enhancing the activities of key enzymes: nitrate reductase (NR) by 125.41 %, nitrite reductase (NiR) by 146.28 %, glutamine synthetase (GS) by 127.45 %, and glutamate synthase (GOGAT) by 290.08 %. These changes led to improved nitrate (NO3-) and ammonium (NH4*) assimilation, with NH4* content in shoots increasing by 199.77 %. In addition, MoNPs significantly reduced As accumulation in maize shoots by 35.69 %, lowered the translocation factor from 0.51 to 0.402, and decreased the bioaccumulation factor from 1.24 to 0.96. In the rhizosphere, MoNPs decreased bacterial alpha-diversity while enhancing fungal beta-diversity and community structure, with major shifts in the abundance of Proteobacteria, Actinobacteriota, and Ascomycota. Redundancy analysis and Procrustes analysis revealed strong correlations between microbial composition and soil parameters. In summary, molybdenum nanoparticles significantly enhanced maize tolerance to arsenic toxicity by promoting growth, restoring nitrogen metabolism and photosynthetic performance, limiting arsenic accumulation, and supporting a balanced.
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