CONICET | Buscador de Institutos y Recursos Humanos

Ilex paraguariensis (yerba mate) is a species of the family Aquifoliaceae.It is well known as the source of the beverage called mate, traditionallyconsumed in central and southern South America. The yerba mate is grown andprocessed in South America, specifically in northern Argentina, Paraguay,Uruguay and southern Brazil.Researches on microorganisms in several industrial crops have shown characteristics associated withincreased production. There have been several studies on improving the cultivation of yerba mate to increaseproductivity, there is currently little informationon the effect of microorganisms on growth.The aim of this work was isolate, select and characterize bacteria endophytes spore-producing with plant growth promoting properties associated with yerba matethat can be used as bio-fertilizers.We worked with 30 yerbamate seedlings from which were isolated andselected 9 strains of endophytic bacteria spores.To assess the potential for plantgrowth promotion of the isolated bacteriawere determined: the ability to synthesisof indole acetic acid (IAA),production of siderophores, solubilizationof inorganic phosphate and nitrogen fixation.The isolated bacteria were identified based on the gene sequence 16sRNA as belonging to the following genera and species: Bacillus pumilus and Paenibacillus spp.We concluded that endophytic bacteria capable of producingspores isolated from Ilex paraguariensis exhibit characteristics associated withpromoting plant growth. These propertiesmust be evaluated in vitro to demonstrate an increase in crop yields of yerba mate, permitting the use of isolates as biofertilizers, with the advantage ofstaying in crops.

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