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Effects of varying nano-ZnO concentrations on the physiology, biochemistry, root exudate, and root microbial community of Agrostis stolonifera
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2024-09-25 , DOI: 10.1039/d4en00584h
Yian Wang, Ronghui Wang, Jiale He, Tao Li, Xinyue Fu, Jiaxin Li, Genhe He

Nanomaterials find widespread applications, but their potential harm to the environment and ecology necessitates effective recycling methods. In this study, the effects of varying nano-ZnO concentrations (0–1000 mg kg−1) on the Agrostis stolonifera's physiological and biochemical parameters, root exudation, and root-associated microbial communities were systematically examined. At concentrations below 500 mg kg−1, nano-ZnO facilitated growth in root and leaf tissues. Conversely, higher concentrations led to a reduction in chlorophyll a, chlorophyll b, and carotenoid levels, potentially impairing photosynthetic efficiency. Concurrently, malondialdehyde levels in leaf tissues escalated with increasing nano-ZnO concentrations, while the activities of peroxidase, superoxide dismutase, and catalase initially increased before diminishing. SEM-Mapping and TEM analyses substantiated the transport of nano-ZnO within Agrostis stolonifera. At a concentration of 500 mg kg−1 nano-ZnO, root and leaf tissues contained Zn at levels of 0.4 wt% and 3.0 wt%, respectively. Notably, increases in zinc accumulation within both root and leaf tissues correspond with escalating concentrations of nano-ZnO. High concentrations of nano-ZnO reduce the diversity of root exudates and modify the structural characteristics of the root microbial community. Conversely, a lower concentration of nano-ZnO (250 mg kg−1) is associated with an increase in root species richness and diversity, as well as a heightened relative abundance of Gemmatimonas, Bradyrhizobium, Bryobacter, and Ammoniphilus. This study is the first report to provide critical insights into nano-ZnO behavior in Agrostis stolonifera and underscores the necessity for further investigations to elucidate root secretion mechanisms and microbial community dynamics.

中文翻译:


不同浓度纳米ZnO对剪股颖生理生化、根系分泌物及根系微生物群落的影响



纳米材料有着广泛的应用,但它们对环境和生态的潜在危害需要有效的回收方法。本研究系统地研究了不同浓度的纳米ZnO(0-1000 mg kg -1 )对匍匐剪草生理生化参数、根系分泌物和根部相关微生物群落的影响。当浓度低于500 mg kg -1时,纳米ZnO 促进根和叶组织的生长。相反,较高的浓度会导致叶绿素 a、叶绿素 b 和类胡萝卜素水平降低,可能会损害光合作用效率。同时,叶组织中的丙二醛水平随着纳米ZnO浓度的增加而升高,而过氧化物酶、超氧化物歧化酶和过氧化氢酶的活性先增加后减弱。 SEM 绘图和 TEM 分析证实了纳米 ZnO 在Agrostis stolonifera内的传输。在500 mg kg -1纳米ZnO浓度下,根和叶组织的Zn含量分别为0.4 wt%和3.0 wt%。值得注意的是,根和叶组织中锌积累的增加与纳米氧化锌浓度的增加相对应。高浓度的纳米氧化锌降低了根系分泌物的多样性,改变了根部微生物群落的结构特征。 相反,较低浓度的纳米ZnO(250 mg kg -1 )与根系物种丰富度和多样性的增加以及宝石单胞菌属慢生根瘤菌属苔藓杆菌属嗜氨菌属的相对丰度的增加有关。这项研究是第一份对Agrostis stolonifera中纳米 ZnO 行为提供重要见解的报告,并强调了进一步研究以阐明根分泌机制和微生物群落动态的必要性。
更新日期:2024-09-30
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