Zhao Biying, Chen Jiangjun, Zou Yujuan, Dai Zhicong, Xing Peng, Wu Qinglong L
International Genome Centre, Jiangsu University, Zhenjiang 212013, China.
School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang 212013, China.
FEMS Microbiol Ecol. 2023 Mar 23;99(4). doi: 10.1093/femsec/fiad022.
The microbes that are attached to aquatic plants play critical roles in nutrient cycles and the maintenance of water quality. However, their community compositions, biodiversity and functions have not been well explored for the invasive plants in inland waters. Here, the co-occurrence patterns between bacteria and fungi on the leaves of Alternanthera philoxeroides and their potential ecological interactions were studied during the growing seasons. Along with significant variations in the alpha diversity of attached microbes over time, shifts in their community composition were significantly associated with the dynamics of plant stoichiometry, substrate composition and extracellular enzyme activity. Deterministic processes (heterogenous selection) play a predominant role in community assembly of the attached bacteria, while stochasticity (undominated process) was the major driver for the attached fungal assembly. Compared with the free-living microbial network, the attached microbial network was structurally simple but highly modular. The attached microbes had more intra-phylum links (primarily within the phyla Actinomycetota, Alphaproteobacteria, Bacillota and Basidiomycota) and distinct co-exclusion patterns between bacteria and fungi in the modules. In summary, the study will be helpful in understanding the microbes and their interactions in the phyllosphere of A. philoxeroides, an key invasive species under national management and control.
附着在水生植物上的微生物在营养循环和水质维持中发挥着关键作用。然而，内陆水域入侵植物上的微生物群落组成、生物多样性及其功能尚未得到充分研究。在此，研究了生长季节期间空心莲子草叶片上细菌和真菌的共现模式及其潜在的生态相互作用。随着附着微生物的α多样性随时间发生显著变化，其群落组成的变化与植物化学计量、底物组成和细胞外酶活性的动态显著相关。确定性过程（异质性选择）在附着细菌的群落组装中起主要作用，而随机性（非主导过程）是附着真菌组装的主要驱动因素。与自由生活的微生物网络相比，附着的微生物网络结构简单但高度模块化。附着的微生物具有更多门内连接（主要在放线菌门、α-变形菌门、芽孢杆菌门和担子菌门内），并且在模块中细菌和真菌之间存在明显的相互排斥模式。总之，该研究将有助于了解国家管控的重点入侵物种空心莲子草叶际中的微生物及其相互作用。
