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The study aimed to explore the bacterial community composition and the functions of core microbiota in Eucommia ulmoides bark. The bark samples of E. ulmoides were collected from Wangcang Sichuan Province, Cili Hunan Province, and Zunyi Guizhou Province, in China, respectively. Through the high-throughput sequencing methods and techniques, the community composition, core microbiota, and function of the bacteria were studied. The bacterial community of E. ulmoides bark consisted of 9 phyla, 11 classes, 22 orders, 28 families, 31 genera, and 37 OTUs. At the genus level, the dominant genus was the unclassified bacteria of Cyanobacteria, with a relative abundance of 97.01%. The bacterial communities of E. ulmoides bark from different areas have their unique units except for the common microbiota. The core microbiota of bacteria included an unclassified genus of Cyanobacteria, an unclassified genus of Mitochondria, Pseudomonas, Sphingobium, Rhizobium, Novosphingobium, Enterobacter, Rhodococcus, Curtobacterium, and Ralstonia. FAPROTAX function prediction suggested that the core microbiota has a substantial potential for photoautotrophy, phototrophy, aerobic chemoheterotrophy, chemoheterotrophy. Ten taxa composed the core microbiota, and the majority of them were related to the pharmacologically active ingredients of E. ulmoides bark. The research provides a scientific basis for the biological marker of genuineness and microbial technology for improving the content of medicinal ingredients of E. ulmoides. [ABSTRACT FROM AUTHOR]

The composition and yield of secondary metabolites of Eucommia ulmoides are important indices of the quality of medicinal materials, and their synthesis and accumulation are affected by both internal and external factors. However, the influential extent and mechanism of these factors on the pharmacologically active ingredients of E. ulmoides are still being elucidated. In this study, we selected 72 of E. ulmoides from 24 regions in China, and investigated the genetic diversity, pharmacologically active ingredients, soil physicochemical properties, and bark bacterial communities, along with the effects of genotypes and environmental factors on pharmacologically active ingredients. Results showed that genetic characteristics among the 24 regions there were no significant different, however, 12 different haplotypes were clearly revealed based on haplotype network analysis. The contents of pinoresinol diglucoside and geniposide acid were mainly affected by different climate and soil physiochemical factors, while aucubin was only sinificantly affected by soil organic matter. All of, the three pharmacologically active ingredients mentioned above were significantly correlated with the dominant genus Lactobacillus , Escherichia , Bacteroides and Faecalibacterium , suggesting that the active ingredients were affected by bark microorganisms. In conclusion, our analysis indicated that the accumulation of pharmacologically active ingredients of E. ulmoides were comprehensively affected genotype, environmental factors (biological and abiotic factors), and their interaction, with genotype had the greatest impact. These results provide important basic information for the future breeding, selection of cultivation conditions and assistance of microbial technology of E. ulmoides. • Index ingredients were more sensitive to host evolution. • Microorganisms were important biological factors affecting active ingredients. • Active ingredients had different responses to environmental factors. • Genotypes have the greatest influence on the accumulation of active ingredients. [ABSTRACT FROM AUTHOR]