Abstract

TORTORA, María L. et al. Evaluation of an autochthonous strain of Gluconacetobacter sp. ability to improve the initial growth of sugarcane crop. Rev. ind. agric. Tucumán [online]. 2022, vol.99, n.1, pp.29-36. ISSN 1851-3018.

Biofertilizers constituted by plant growth promoting bacteria, are a sustainable alternative to stimulate sugarcane growth and development. The objective of this work was to isolate and characterize an endophytic Gluconacetobacter strain capable of colonizing and promoting crop growth. It also has a high viability and stability in low cost culture medium for its pilot and industrial scale propagation. From sugarcane stems, the endophytic strain Gluconacetobacter OCG1 with potential ability to fix nitrogen was isolated. After TUC 95- 10 sugarcane buds inoculation, it was observed that OCG1 strain was able to colonize root system and to increase fresh and dry weight of both vegetative and root systems. Finally, OCG1 strain showed high ability to generate large amount of biomass and to produce and excrete exopolysaccharides (EPS) in the industrial culture medium used for the propagation at pilot scale. Also, it retained its viability during long storage at room temperature (25°C). Hence, Gluconacetobacter OCG1 strain could be used as a biofertilizer to obtain high added value sugar cane seedlings from the inoculation of isolated buds.

Keywords : sustainability; sugarcane field; biological nitrogen fixation.

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