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Antagonistic interactions between endophytic cultivable bacterial communities isolated from the medicinal plant E chinacea purpurea

2015; Wiley; Volume: 18; Issue: 8 Linguagem: Inglês

10.1111/1462-2920.12911

1462-2920

Isabel Maida, Carolina Chiellini, Alessio Mengoni, Emanuele Bosi, Fabio Firenzuoli, Marco Fondi, Renato Fani,

Plant tissue culture and regeneration

Summary In this work we have studied the antagonistic interactions existing among cultivable bacteria isolated from three ecological niches (rhizospheric soil, roots and stem/leaves) of the traditional natural medicinal plant E chinacea purpurea . The three compartments harboured different taxonomic assemblages of strains, which were previously reported to display different antibiotic resistance patterns, suggesting the presence of differential selective pressure due to antagonistic molecules in the three compartments. Antagonistic interactions were assayed by the cross‐streak method and interpreted using a network‐based analysis. In particular ‘within‐niche inhibition’ and ‘cross‐niche inhibition’ were evaluated among isolates associated with each compartment as well as between isolates retrieved from the three different compartments respectively. Data obtained indicated that bacteria isolated from the stem/leaves compartment were much more sensitive to the antagonistic activity than bacteria from roots and rhizospheric soil. Moreover, both the taxonomical position and the ecological niche might influence the antagonistic ability/sensitivity of different strains. Antagonism could play a significant role in contributing to the differentiation and structuring of plant‐associated bacterial communities.