Response strategies of stem/leaves endophyte communities to nano-plastics regulate growth performance of submerged macrophytes

文献类型： 外文期刊

第一作者： Hao, Beibei

作者： Hao, Beibei;Zhang, Siyi;He, Bin;Wu, Haoping

作者机构：

关键词： Submerged Macrophytes; Endophytic bacteria; Nano-plastics exposure; Antioxidative stress

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：13.6； 五年影响因子：12.7 ）

ISSN： 0304-3894

年卷期： 2024 年 464 卷

页码：

收录情况： SCI

摘要： Research on the toxicity effects of nano-plastics on submerged macrophytes has been increasing over the past several years. However, how the endophytic bacteria of submerged macrophytes respond to nano-plastics re-mains unknown, although they have been widely shown to help terrestrial plants cope with various environ-mental stressors. Here, a microcosm experiment was performed to unravel the effects of high concentration of nano-plastics (20 mg/L) on three submerged macrophyte (Vallisneria natans, Potamogeton maackianus, Myr-iophyllum spicatum) and their endophytic bacterial communities. Results indicated that nano-plastics induced antioxidative stress in plants, but significantly reduction in relative growth rate (RGR) only occurred in V. natans (from 0.0034 to-0.0029 day-1), accompanied by change in the stem/leaves endophyte community composition. Further analysis suggested nano-plastics caused a reduction in environmental nutrient availability and the proportion of positive interactions between endophyte communities (43%), resulting in the lowest RGR of V. natans. In contrast, endophytes may help P. maackianus and M. spicatum cope with nano-plastic stress by increasing the proportion of positive correlations among communities (70% and 75%), leaving their RGR un-affected. Collectively, our study elucidates the species-specific response strategies of submerged macrophyte-endophyte to nano-plastics, which helps to reveal the different phytoremediation potential of submerged mac-rophytes against nano-plastic pollution.

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