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Dual effects of FeNPs on maize growth and water use are actively mediated by arbuscular mycorrhizal fungus via rhizosphere interactions
  • +10
  • yumiao Yang,
  • minha naseer,
  • ying zhu,
  • shuangguo Zhu,
  • baozhong Wang,
  • yibo Wang,
  • jing wang,
  • hao zhu,
  • wei wang,
  • li zhu,
  • yixia Gao,
  • Hong-Yan Tao,
  • youcai Xiong
yumiao Yang
Lanzhou University

Corresponding Author:yangyumiao111@163.com

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minha naseer
Lanzhou University
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ying zhu
Gansu Academy of Sciences
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shuangguo Zhu
Lanzhou University
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baozhong Wang
Lanzhou University
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yibo Wang
Tianshui Normal University
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jing wang
Lanzhou University
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hao zhu
Lanzhou University
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wei wang
Lanzhou University
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li zhu
Lanzhou University
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yixia Gao
Lanzhou University
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Hong-Yan Tao
Lanzhou University
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youcai Xiong
Lanzhou University
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Abstract

Nanoscale zero-valent iron (FeNPs) can affect plant growth and water uptake positively or negatively. Yet, its mechanism is still unclear, particularly for differentiate functional roles of FeNPs in plant-soil interaction. To address this issue, we first confirmed 1.0 and 1.5 g·kg-1 FeNPs as growth-promotion concentrations and 1.5 g·kg-1 as optimal one, while 2.0 g·kg-1 turned to restrict growth in maize seedlings, comparing with CK. When AM fungus (Funneliformis mosseae) was inoculated and cultured with FeNPs, 1.0 and 1.5 g·kg-1 FeNPs further evidently enhanced water uptake and biomass accumulation (P<0.05). ), as affected by the activated AMF colonization carrier. Contrarily, FeNPs turned to promote AMF colonization and development, achieving greater iron translocation efficiency in mycorrhiza (P < 0.05). Yet, 2.0 g·kg-1 FeNPs restricted AMF infection in roots, a negative effect. To investigate the mycorrhizal-FeNPs symbiosis, scanning electron microscopy was used to scan the extraradical hyphae, showing that hyphae intercepted excessive iron nanoparticles, alleviating the blockage of root surface apertures and ultimately restoring root activity. Therefore, dual effects of FeNPs on maize physiology were actively mediated by AMF via rhizosphere interactions. The findings provided new insights into safe and efficient utilization of nanomaterials in agro-ecosystems.