阿尔泰银莲花根际土壤微生物多样性研究

Microbial diversity in rhizosphere soil of Anemone altaica

关键词:  阿尔泰银莲花, 土壤微生物, 高通量测序, 群落结构, 物种多样性

Key words:  Anemone altaica, soil microorganism, high-throughput sequencing, community structure, species diversity

摘要:

为了解野生和栽培阿尔泰银莲花根际土壤微生物多样性的差异,该研究采用Illumina MiSeq高通量测序技术对野生和栽培阿尔泰银莲花根际土壤微生物的群落组成和多样性进行探究。结果表明:(1)野生阿尔泰银莲花根际土壤的真菌多样性显著高于栽培阿尔泰银莲花(P<0.05),而细菌多样性差异不显著(P>0.05); NMDS分析结果显示,野生和栽培阿尔泰银莲花根际土壤真菌群落结构差异更显著。(2)细菌9 566个可操作分类单元(OTUs)涉及39门127纲315目500科886属,真菌2 670个OTUs涉及15门57纲138目293科597属。在门水平上,细菌群落中的变形菌门、酸杆菌门、放线菌门及真菌群落中的担子菌门、子囊菌门、被孢霉门均为野生和栽培阿尔泰银莲花根际土壤优势菌门,但其相对丰度在不同生长方式下存在差异。(3)环境因子关联分析(RDA)结果显示,土壤有机质是影响土壤细菌群落的主要因子(P<0.05),土壤pH、碱解氮和有效磷是影响真菌群落的主要因子(P<0.05)。综上认为,野生和栽培下的阿尔泰银莲花根际土壤微生物群落组成和多样性存在显著差异,这种差异可能与不同生长条件下的土壤理化性质存在密切的联系,该研究结果对阿尔泰银莲花科学种植以及土壤改良具有一定意义。

Abstract:

In order to understand the difference in microbial diversity between wild and cultivated Anemone altaica rhizosphere soils, Illumina MiSeq high-throughput sequencing technology was used to study the microbial composition and diversity in rhizosphere soils between wild and cultivated A. altaica. The results were as follows:(1)Alpha diversity analysis showed that the diversity of fungi in the rhizosphere soil of wild A. altaica was significantly higher than that of cultivated A. altaica(P<0.05), while the difference in bacterial diversity was not significant(P>0.05). The non-metric multidimensional scaling(NMDS)analysis revealed that the fungal community structures of wild and cultivated A. altaica rhizosphere soils had more significant differences.(2)A total of 9 566 operational taxonomic units(OTUs)of bacteria belonged to 39 phyla, 127 classes, 315 orders, 500 families and 886 genera, and 2 670 OTUs of fungi belonged to 15 phyla, 57 classes, 138 orders, 293 families and 597 genera. The bacterial phylum Proteobacteria, Acidobacteria, Actinobacteria and the fungal phylum Basidiomycota, Ascomycota, Mortierellomycota were the dominant phyla in the rhizosphere soil between wild and cultivated plants, but their relative abundance was different under different growth modes. At genus level, Candidatus_Udaeobacter, norank_f_Xanthobacteraceae and Rokubacteriales were the dominant rhizosphere soil bacteria of wild Anemone altaica. However, Candidatus_Udaeobacter, Vicinamibacter and Rokubacteriales were the dominant rhizosphere soil bacteria of cultivated Anemone altaica. The dominant rhizosphere fungi of wild A. altaica were Mortierella, Sebacina and Russula, while the dominant rhizosphere fungi of cultivated Anemone altaica were Sebacina, Mortierella and unclassified_f_Hyaloscyphaceae.(3)The redundancy analysis(RDA)showed that soil organic matter was the main factor affecting soil bacterial community(P < 0.05), and soil pH, alkali-hydrolyzable nitrogen and available phosphorus were the main factors affecting fungi communities(P < 0.05), while bacterial community structure were not significantly correlated with soil pH, alkali-hydrolyzable nitrogen and available phosphorus(P > 0.05). In summary, this study reveales significant differences in the composition and diversity of rhizosphere microbial communities between wild and cultivated A. altaica, which may be closely related to the physicochemical properties of soils under different growing conditions. The results of this study have certain significance for scientific planting and soil improvement of A. altaica.