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Endophytic bacterial community living in roots of healthy and ‘Candidatus Phytoplasma mali’-infected apple (Malus domestica, Borkh.) trees

Antonie van Leeuwenhoek Aims and scope Submit manuscript

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Abstract

‘Candidatus Phytoplasma mali’, the causal agent of apple proliferation (AP) disease, is a quarantine pathogen controlled by chemical treatments against insect vectors and eradication of diseased plants. In accordance with the European Community guidelines, novel strategies should be developed for sustainable management of plant diseases by using resistance inducers (e.g. endophytes). A basic point for the success of this approach is the study of endophytic bacteria associated with plants. In the present work, endophytic bacteria living in healthy and ‘Ca. Phytoplasma mali’-infected apple trees were described by cultivation-dependent and independent methods. 16S rDNA sequence analysis showed the presence of the groups Proteobacteria, Acidobacteria, Bacteroidetes, Actinobacteria, Chlamydiae, and Firmicutes. In detail, library analyses underscored 24 and 17 operational taxonomic units (OTUs) in healthy and infected roots, respectively, with a dominance of Betaproteobacteria. Moreover, differences in OTUs number and in CFU/g suggested that phytoplasmas could modify the composition of endophytic bacterial communities associated with infected plants. Intriguingly, the combination of culturing methods and cloning analysis allowed the identification of endophytic bacteria (e.g. Bacillus, Pseudomonas, and Burkholderia) that have been reported as biocontrol agents. Future research will investigate the capability of these bacteria to control ‘Ca. Phytoplasma mali’ in order to develop sustainable approaches for managing AP.

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Authors and Affiliations

  1. Dipartimento di Scienze Agrarie e Ambientali – Produzione, Territorio, Agroenergia, Università degli Studi, via Celoria 2, 20133, Milan, Italy

    Daniela Bulgari, Paola Casati, Fabio Quaglino & Piero A. Bianco

  2. Plant Protection Department, Mustafa Kemal University, 31034, Antakya, Hatay, Turkey

    Adem I. Bozkurt & Kadriye Çağlayan

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  1. Daniela Bulgari
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  2. Adem I. Bozkurt
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  3. Paola Casati
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  4. Kadriye Çağlayan
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  5. Fabio Quaglino
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  6. Piero A. Bianco
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Correspondence to Piero A. Bianco.

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Bulgari, D., Bozkurt, A.I., Casati, P. et al. Endophytic bacterial community living in roots of healthy and ‘Candidatus Phytoplasma mali’-infected apple (Malus domestica, Borkh.) trees. Antonie van Leeuwenhoek 102, 677–687 (2012). https://doi.org/10.1007/s10482-012-9766-3

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