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RESUMEN La contaminación por metales pesados representa un problema creciente en la cultura industrializada. Representan una amenaza biológica, pues no son biodegradables, aunque existen mecanismos que poseen los organismos para acumular, traslocar, transformar, inmovilizar o estabilizarlos. El níquel es un metal pesado presente en descargas mineras, en la industria de la fundición, refinación de elementos metálicos, entre otras. Es conocido que la asociación de plantas con algunas bacterias benéficas ayuda a las plantas a tolerar niveles de estrés como la contaminación por metales pesados. En el presente trabajo se propuso remediar suelo contaminado con níquel, con ayuda de Medicago sativa, una planta hiperacumuladora, en asociación con la cepa promotora de crecimiento y biorremediadora Pseudomonas putida KT2440. Se establecieron tratamientos semi-hidropónicos donde se trasplantaron germinados de M. sativa inoculados y no con la cepa bacteriana. Se determinó la concentración del metal en el suelo a distintos tiempos de tratamiento por medio de espectrofotometría de absorción atómica. La cepa bacteriana, 15 días posteriores al montaje del experimento, no fue posible detectarla, tampoco se observó tolerancia al estrés por la planta. Sin embargo, hubo un establecimiento prolífico de hongos y los ensayos de absorción atómica revelan una disminución significativa en los niveles de concentración de níquel en el suelo. ABSTRACT Heavy metal pollution represents a growing problem in the industrialized culture. They represent a biological threat, because they are not biodegradable, although there are mechanisms that the organisms possess to accumulate, translocate, transform, immobilize or stabilize them. Nickel is a heavy metal present in mining discharges, in the foundry industry, refining of metallic elements, among others. It is known that the association of plants with some benefidal bacteria helps plants to tolérate stress levels such as heavy metal contamination. In the present work it was proposed to remedy soil contaminated with nickel, with the help of Medicago sativa, a hyperaccumulating plant, in association with the growth promoter and bioremediator strain P. putida KT2440. Semi- hydroponic treatments were established where germinated M. sativa inoculated were transplanted and not with the bacterial strain. The concentration of the metal in the soil at different treatment times was determined by means of atomic absorption spectrophotometry. The bacterial strain, 15 days after the assembly of the experiment, it was not possible to detect it, ñor was tolerance to stress by the plant observed. However, there was a prolific establishment of fungí and the atomic absorption reveal a significant decrease in the concentration levels of nickel in the soil.
Contaminación de suelo, Heavy metals; Hyperaccumulative plants; Medicago sativa; Mesophilic microorganisms; Pseudomonas putida KT2440; contaminated soil, Contaminación de suelo; Medicago sativa; Metales pesados; Microorganismos mesófilos; Plantas hiperacumuladoras; Pseudomonas putida KT2440, Pseudomona putida KT2440, Contaminación de suelo; Medicago sativa; Metales pesados; Microorganismos mesófilos; Plantas hiperacumuladoras; Pseudomonas putida KT2440, Microorganismos mesófilos, Heavy metals; Hyperaccumulative plants; Medicago sativa; Mesophilic microorganisms; Pseudomonas putida KT2440; contaminated soil, Metales pesados, Plantas hiperacumuladoras, Medicago sativa
Contaminación de suelo, Heavy metals; Hyperaccumulative plants; Medicago sativa; Mesophilic microorganisms; Pseudomonas putida KT2440; contaminated soil, Contaminación de suelo; Medicago sativa; Metales pesados; Microorganismos mesófilos; Plantas hiperacumuladoras; Pseudomonas putida KT2440, Pseudomona putida KT2440, Contaminación de suelo; Medicago sativa; Metales pesados; Microorganismos mesófilos; Plantas hiperacumuladoras; Pseudomonas putida KT2440, Microorganismos mesófilos, Heavy metals; Hyperaccumulative plants; Medicago sativa; Mesophilic microorganisms; Pseudomonas putida KT2440; contaminated soil, Metales pesados, Plantas hiperacumuladoras, Medicago sativa
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