[Genetic characterization of rice endophytic bacteria (Oryza sativa L.) with antimicrobial activity against Burkholderia glumae].

Revista Argentina de microbiología
Renzo A Valdez-NuñezJorge Torres-Delgado

Abstract

The aim of the present study was to isolate, select and characterize endophytic bacteria in rice inhibiting Burkholderia glumae THT as well as to characterize the genetic diversity and virulence factors in strains of B. glumae and Burkholderia gladioli of rice. Rice plants were collected in 4 departments from the northern region of Peru, isolating endophytic bacteria, after tissue sterilization, at 30°C (48h) in Trypticase Soy Agar (TSA), evaluating the antimicrobial activity against B. glumae THT, production of siderophores, resistance of toxoflavine and partial sequencing of the 16S rRNA gene. Furthermore, B. glumae and B. gladioli were isolated in selective medium (pH 4.5) at 41°C/72h. Molecular identification was performed using BOX-PCR and sequencing of the 16S rRNA gene, in addition to the production of extracellular enzymes, motility tests and sensitivity/resistance to bactericides. One hundred and eighty nine (189) endophytic bacteria were isolated, and only 9 strains showed antimicrobial activity against B. glumae THT, highlighting Burkholderia vietnamiensis TUR04-01, B. vietnamiensis TUR04-03 and Bacillus aryabhattai AMH12-02. The strains produced siderophores and at least 55.5% were resistant to toxoflavin. Additiona...Continue Reading

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Citations

Nov 19, 2020·Phytopathology·Laura Ortega, Clemencia M Rojas

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