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The assembly of plant microbial communities is a complex process orchestrated by plant physiology and microbial interactions under changing environmental conditions. In this work we aim to disentangle how an aggressive vascular pathogen, Ophiostoma novo-ulmi, affects the composition of the resident mycobiome of field elm (Ulmus minor). We also aim to determine the extent to which the inoculation of beneficial endophytes buffers the changes induced by the pathogen in the resident mycobiome composition. Three U. minor genotypes, two resistant and one susceptible to O. novo-ulmi, were inoculated with i) the pathogen, ii) a consortium of three beneficial endophytes, or iii) the endophyte consortium followed by pathogen inoculation. Endophyte composition of stem samples was profiled by high throughput sequencing of the first internal transcribed spacer region of the ribosomal DNA. A total of 365 ASVs were obtained, 61 of which were core members. Pathogen colonization reduced the ASV richness while endophyte inoculation increased the Shannon diversity. In most cases, the endophyte consortium inoculation prevented most of the changes in the mycobiome composition induced by the pathogen. At the genotype level, both alpha and beta diversity varied strongly, with latent pathogens being more abundant in the susceptible genotype. Overall, the results evidence that inoculation of plant beneficial endophytes buffers the changes produced in the mycobiome by aggressive pathogens.
The assembly of plant microbial communities is a complex process orchestrated by plant physiology and microbial interactions under changing environmental conditions. In this work we aim to disentangle how an aggressive vascular pathogen, Ophiostoma novo-ulmi, affects the composition of the resident mycobiome of field elm (Ulmus minor). We also aim to determine the extent to which the inoculation of beneficial endophytes buffers the changes induced by the pathogen in the resident mycobiome composition. Three U. minor genotypes, two resistant and one susceptible to O. novo-ulmi, were inoculated with i) the pathogen, ii) a consortium of three beneficial endophytes, or iii) the endophyte consortium followed by pathogen inoculation. Endophyte composition of stem samples was profiled by high throughput sequencing of the first internal transcribed spacer region of the ribosomal DNA. A total of 365 ASVs were obtained, 61 of which were core members. Pathogen colonization reduced the ASV richness while endophyte inoculation increased the Shannon diversity. In most cases, the endophyte consortium inoculation prevented most of the changes in the mycobiome composition induced by the pathogen. At the genotype level, both alpha and beta diversity varied strongly, with latent pathogens being more abundant in the susceptible genotype. Overall, the results evidence that inoculation of plant beneficial endophytes buffers the changes produced in the mycobiome by aggressive pathogens.
Elm trees are one of the most important ornamental trees and are widely used in the design of urban green spaces. Dutch elm disease is recognized as one of the most important elm diseases in the world. The disease has become an epidemic worldwide and at least three species of Ophiostoma including O. ulmi, O. novo-ulmi and O. Himal-ulmi that differ in geographical distribution and invasion power, are involved in this disease. In Iran, O. ulmi and O. novo-ulmi are known to involve in this disease, with O. novo-ulmi being more virulent. Management of the disease is mainly achieved through preventive and quarantine methods, health measures, resistant cultivars and the use of chemical compounds. Various aspects of the disease, including disease symptoms and signs, pathogen biology and ecology, disease management methods are reviewed in this paper.
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