Abstract

SANTIAGO-GERONIMO, Tomasita; LOZOYA-SALDANA, Héctor  and  RODRIGUEZ-MEJIA, María Lourdes. Symbiotic bacteria associated to Prosthechea citrina, a Mexican endemic orchid. Rev. mex. fitopatol [online]. 2020, vol.38, n.3, pp.398-407.  Epub Nov 27, 2020. ISSN 2007-8080.  https://doi.org/10.18781/r.mex.fit.2004-2.

Along the process of in vitro plant tissue culture, potential plant pathogenic and/or apparent contaminant microorganisms occur, which eventually cause loss of plant material. The objective of this research was to identify endophytic bacteria in Prosthechea citrina, an endemic Mexican orchid, by isolating, in vitro culturing, and sequencing the 16S gen from ribosomal RNA of the bacterial isolates. Aeromonas hydrophila and Enterobacter sp. were identified as symbionts, non-pathogenic, from the bulb and the lower part of the leaf, and A. hydrophila in the middle and top of the leaf. Four antibiotics were evaluated for their in vitro control using the disc-plate method, quantifying the colony diameter growth. The highest statistically significant inhibition halos were obtained with Oxytetracycline for A. hydrophila, and with ampicillin for Enterobacter sp. The presence of endophytic bacteria is demonstrated, with tissue specificity location, as well as the corresponding inhibitory antibiotic.

Keywords : Symbioses; endophytic bacteria; antibiotics.

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