Cheng Xueyu, Li Xinyang, Cai Zhonghua, Wang Zongkang, Zhou Jin
Marine Ecology and Human Factors Assessment Technical Innovation Center of Natural Resources Ministry, Tsinghua Shenzhen International Graduate School, Shenzhen 518055, China.
Shenzhen Public Platform for Screening and Application of Marine Microbial Resources, Institute for Ocean Engineering, Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China.
Plants (Basel). 2024 Sep 20;13(18):2627. doi: 10.3390/plants13182627.
Biodegradable microplastics (Bio-MPs) are a hot topic in soil research due to their potential to replace conventional microplastics. Biofertilizers are viewed as an alternative to inorganic fertilizers in agriculture due to their potential to enhance crop yields and food safety. The use of both can have direct and indirect effects on rhizosphere microorganisms. However, the influence of the coexistence of "Bio-MPs and biofertilizers" on rhizosphere microbial characteristics remains unclear. We investigated the effects of coexisting biofertilizers and Bio-MPs on the structure, function, and especially the carbon metabolic properties of crop rhizosphere bacteria, using a pot experiment in which polyethylene microplastics (PE-MPs) were used as a reference. The results showed that the existence of both microplastics (MPs) changed the physicochemical properties of the rhizosphere soil. Exposure to MPs also remarkably changed the composition and diversity of rhizosphere bacteria. The network was more complex in the Bio-MPs group. Additionally, metagenomic analyses showed that PE-MPs mainly affected microbial vitamin metabolism. Bio-MPs primarily changed the pathways related to carbon metabolism, such as causing declined carbon fixation/degradation and inhibition of methanogenesis. After partial least squares path model (PLS-PM) analysis, we observed that both materials influenced the rhizosphere environment through the bacterial communities and functions. Despite the degradability of Bio-MPs, our findings confirmed that the coexistence of biofertilizers and Bio-MPs affected the fertility of the rhizosphere. Regardless of the type of plastic, its use in soil requires an objective and scientifically grounded approach.
可生物降解微塑料（Bio-MPs）因其有望替代传统微塑料而成为土壤研究中的热门话题。生物肥料因其具有提高作物产量和食品安全的潜力，被视为农业中无机肥料的替代品。两者的使用都可能对根际微生物产生直接和间接影响。然而，“Bio-MPs与生物肥料”共存对根际微生物特性的影响仍不清楚。我们通过盆栽试验，以聚乙烯微塑料（PE-MPs）作为对照，研究了生物肥料与Bio-MPs共存对作物根际细菌结构、功能尤其是碳代谢特性的影响。结果表明，两种微塑料（MPs）的存在改变了根际土壤的理化性质。暴露于MPs也显著改变了根际细菌的组成和多样性。Bio-MPs组的网络更为复杂。此外，宏基因组分析表明，PE-MPs主要影响微生物的维生素代谢。Bio-MPs主要改变了与碳代谢相关的途径，如导致碳固定/降解下降和抑制甲烷生成。经过偏最小二乘路径模型（PLS-PM）分析，我们观察到两种物质都通过细菌群落和功能影响根际环境。尽管Bio-MPs具有可降解性，但我们的数据证实生物肥料与Bio-MPs共存会影响根际的肥力。无论塑料类型如何，其在土壤中的使用都需要一种客观且有科学依据的方法。
