Xylella cytoscape10/29/2022 ![]() The plant microbiome is known to be species- and cultivar-specific moreover, each plant habitat harbors its own specific microbiome. The central role of the plant-associated microbiome in maintaining host’s fitness is being recognized more and more, and plants are now regarded as “holobionts”, which include the plant itself and the entire community of associated microbes, seen as a single unit of evolution. Such beneficial bacteria might be isolated in the future for biological treatment of the OQDS. The maintenance of a healthy microbiota with higher diversity and the presence of cultivar-specific microbes might support the resistance of “Leccino” to X. Several bacterial taxa specifically associated with “Leccino” showed potential interactions with X. Diversity of microbiota in Xf-uninfected “Leccino” was higher than in Xf-uninfected “Cellina di Nardò”. The genus Pseudomonas dominated all “Leccino” and Xf-uninfected “Cellina di Nardò” trees, whereas Ammoniphilus prevailed in Xf-infected “Cellina di Nardò”. fastidiosa infection, while “Leccino” (both infected and uninfected) maintained a similar microbiota. “Cellina di Nardò” showed a drastic dysbiosis after X. Metabarcoding of 16S rRNA genes and fungal ITS2 was used to characterize both total and endophytic microbiota in olive branches and leaves. The resistant cultivar “Leccino” was compared to the susceptible cultivar “Cellina di Nardò”, in order to identify microbial taxa and parameters potentially involved in resistance mechanisms. ![]() fastidiosa-infected ( Xf-infected) and -uninfected ( Xf-uninfected) olive trees in Salento, to assess the level of dysbiosis and to get first insights into the potential role of microbial endophytes in protecting the host from the disease. ![]() We explored the microbiome associated with X. Xylella fastidiosa is a highly virulent pathogen that causes Olive Quick Decline Syndrome (OQDS), which is currently devastating olive plantations in the Salento region (Apulia, Southern Italy). ![]()
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