摘要
为研究内陆河流域不同浮床植物的根际微生物群落结构、多样性、潜在生态功能及其差异,采集了位于沱江二级支流赤水河生态浮床上的风车草(Cyperus involucratus)、黄菖蒲(Iris pseudacorus)、再力花(Thalia dealbata)、鸢尾(Iris tectorum)、美人蕉(Canna indica)、梭鱼草(Pontederia cordata)6种植物生长旺盛时期的根系样本,通过细菌16sRNA片段高通量测序和生物信息学手段,分析了微生物群落结构组成、生物多样性以及潜在的生态功能.结果表明,变形菌门(Proteobacteria)在6种浮床植物根际细菌中占绝对优势,丰度达47.5％～72.2％,在植物生长环境较为相似且空间距离较近的情况下,不同浮床植物根际微生物属水平优势种群丰度差异仍较大.微生物群落多样性由大到小依次为鸢尾、美人蕉、黄菖蒲、风车草、再力花、梭鱼草,同科同属的黄菖蒲和鸢尾根际细菌组成相对较为相似.风车草根际硝化/反硝化功能菌群丰度更高,梭鱼草根际芳香族化合物降解功能菌群丰度显著高于另外5种植物.根长、株高和生物量更大的植物根际微生物中芽殖杆菌属丰度显著更高,植物生长指标与部分根际细菌氮转化存在正相关关系.研究结果可为浮床植物根际微生物群落研究和生态浮床的建设优化提供参考.
Abstract
In order to study the structure,diversity,potential ecological functions and differences of the rhizosphere microbial community of different floating bed plants in inland river basin,six root species of EFBs plants,including Cyperus involucratus,Iris pseudacorus,Thalia dealbata,Iris tectorum,Canna indica and Pontederia cordata,were collected during the vigorous growth period located in the Chishui River,a secondary tributary of the Tuojiang River.Through high-throughput sequencing of bacterial 16S rRNA fragments and bioinformatics methods,the microbial community composition,biodiversity,and potential ecological functions were analyzed.The results show that Proteobacteria is absolutely dominant in the rhizosphere bacteria of six floating bed plants,with an abundance of 47.5％～72.2％.On the condition that the environment of plant growth is relatively similar and the spatial distance is relatively close,the abundance of dominant populations at the genus level of different floating bed plants is still quite different.The microbial community diversity from large to small is I.tectorum,C.indica,I.pseudacorus,C.involucratus,T.dealbata and P.cordata.The rhizosphere bacteria composition of I.pseudacorus and I.tectorum is relatively similar.The abundance of nitrification/denitrification functional bacterial communities in the rhizosphere of C.involucratus is higher,while the abundance of degrading aromatic compounds functional bacterial communities in the rhizosphere of P.cordata is significantly higher than the other five plants.In plants with longer roots,taller height,and greater biomass,the abundance of Gemmobacter in the rhizosphere microbiome is significantly higher.There is a positive correlation between plant growth indicators and nitrogen transformation of some rhizosphere bacteria.The research results can provide reference for study on rhizosphere microbial community of floating bed plants and ecological floating bed construction.
基金项目
四川省科技计划(2022YFS0472)
四川省科技计划(2022YFS0498)
四川省科技计划(2023YFS0377)
四川省省级科研院所基本科研业务费项目(2022JDKY0022)
维普
万方数据