Diversidad de las bacterias rizosféricas asociadas a plantas de Typha dominguesis en humedales del río Almendares

Abstract

Wetlands environmental management is of current interest, but the studies involving microorganisms
associated with plants of these ecosystems are still limited. The objective of this study was to characterize the diversity
of bacterial groups present on the rhizosphere of natural wetland hydrophytes, regarding their micro-morphology and
physiological - biochemical behavior with chemical compounds of environmental interest. 58 bacterial isolates from Typha
dominguensis rhizosphere, in Almendares River wetlands, Havana, were studied. They were characterized micro - morphologically,
culturally and with respect to stain response, also their interaction with different carbohydrates, nitrogen,
phosphorus and heavy metals sources was analyzed. The representation of five different bacterial groups was detected,
due to the diversity of micro - morphological and staining characteristics, with a wide variety of cultural characteristics.
Isolates presented diverse physiological - biochemical performance. They grew up with different carbon sources (glucose,
manose, xilose, lactose and starch); 41 % assimilated all and 76 % at least three. Some isolates reduced the nitrate (47 %)
and 67 % carried out the ammonification; 60 % accumulated phosphate and different patterns of multiresistance to metals
were observed. The rhizosphere bacteria in association with Typha dominguensis in river wetlands were studied for the
first time in Cuba, highlighting them as an element in the conservation strategies and as agents with bioremediation
potencial use.