Resumen

DIBUT, B et al. Current and prospect situation of endophytic plant-bacterial relations. A case study of Gluconacetobacter diazotrophicus-economically significant crops. cultrop [online]. 2009, vol.30, n.4, pp. 00-00. ISSN 1819-4087.

In recent years, the study of endophytic plant-microorganism associations has grown special interest, emphasizing on the introduction of good agrobiological results into agricultural practice. This work shows an outlook of the current and prospect situation of these associations mostly illustrated by Rhizobium-cereal, Azorhizobium-rice, Azospirillum and Herbaspirillum interactions, as well as cereals and Gluconacetobacter diazotrophicus with different crops. There is a microbial rotation process with Rhizobium bacteria at different cyclical association phases of the agroecosystem (legume, nodule-soil-grass-soil-legume) in relation to productivity physiology and yield. Concerning the study with G. diazotrophicus, on certain tropical vegetable and fruit determinations under Cuban conditions, a cell concentration of 4.2x105 per gram of fresh tissue was recorded in inoculated plants whereas 2.7x102 cells per gram of fresh tissue in non-inoculated ones (control); therefore, it is necessary to increase bacterial concentration, both under experimental and field conditions, to obtain an adequate answer of agrobiological effect on the above mentioned species. The answer of casaba, dasheen and papaya to inoculation constitutes a first world report. There was a great economic impact of inoculation with a higher benefit/cost ratio than 40:1; thus, it is an extremely attractive biotechnology to be introduced into the current agrobiological market. Besides, the result has a scientific, technological, environmental and social impact.

Palabras clave : Gluconacetobacter diazotrophicus; endophytes; bacteria; agrobacterium; food crops.

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