Current and prospect situation of endophytic plant-bacterial relations. A case study of Gluconacetobacter diazotrophicus-economically significant crops
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Abstract
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.
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