Resumen

MARQUEZ-BENAVIDEZ, Liliana et al. Inoculation of Hordeum vulgare var. Armida (barley) with Burkholderia cepacia and Gluconacetobacer diazotrophicus. Investig. Agrar. [online]. 2016, vol.18, n.2, pp.87-94. ISSN 2305-0683.  https://doi.org/10.18004/investig.agrar.2016.diciembre.87-94.

Cropping barley demands an adequate supply of nitrogen (N) which can be applied as nitrogen fertilizer (NF) but if it is applied in excess, as any other inadequate cultural practice, it could lead to the loss of soil productivity. An alternative to reduce and optimize the use of NF in barley is its inoculation with genera of entophytic growth-promoting bacteria (EGPB), such as Burkholderia cepacia and Gluconacetobacter diazotrophicus. The aim of this research was to analyze the effect of B. cepacia and G. diazotrophicus on barley. The experiment was carried out under greenhouse conditions, with a unifactorial experimental design with 6 treatments and 6 replicates in each one: a) noninoculated barley and without NF (absolute control, AC); b) noninculated barley and 50% of NF (control 1, RC1); c) noninculated barley and 100% of NF (relative control 2,RC2), d) barley inoculated with B. cepacia and 50% of NF; e) barley inoculated with G. diazotrophicus and 50% of NF and f) barley coinoculated with B. cepacia and G. diazotrophicus and 50% of NF. The analyzed variables were responses based on its phenotyping and biomass: total dry weight (TDW), at both seedlings and flowering stages. Results showed a positive response of B. cepacia with TDW of 0.85 g a value with no statistical difference when compared to the 0.54 gr TDW of noninculated barley and 100% of NF used as a relative control (RC). At flowering stage B. cepacia exerted a positive effect with a TDW of 4.48 g., which is equal to the effect caused with the coinculation of B. cepacia and G. diazotrophicus which produced a TDW of 3.29 g. These values had a significant statistical difference when compared to the 1.49 grs of TDW These results suggest that there exists a specific interaction between B. cepacia and barley, which favors the best radical absorption of 50% NF without causing any nutritional deficiency problem in plant growth.

Palabras clave : colonization; radical absorption; endophytic plant growth-promoting bacteria.

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