REMOCIÓN BIOLÓGICA DE MICROCISTINA-LR MEDIANTE MICROORGANISMOS AUTÓCTONOS AISLADOS DEL RIO DE LA PLATA

CRETTAZ MINAGLIA, MELINA; ARANDA OSWALDO; JUÁREZ IVAN; OLIVER CRISTIAN; PEZZONI MAGDALENA; COSTA CRISTINA; SEDAN DANIELA; ANDRINOLO DARÍO; GIANNUZZI LEDA

Buenos Aires

Congreso; 3º Congreso Interamericano de Cambio Climático; 2018

AIDIS

Cyanobacterial blooms in surface waters is a serious health hazard to animals and humans because they release cyanotoxins, which are toxic or carcinogenic. Toxic Microcystin-LR (MC-LR) generated by Microcystis aeruginosa is one of the most abundant and common species frequently found in cyanobacterial blooms in fresh and brackish waters.Toxic cyanobacterial blooms are a global problem in aquatic ecosystems. The genus Microcystis, which produces toxins known as microcystins (MCs), has a cosmopolitan distribution. Thus, the contamination with MCs is frequent in water resources. These toxins are resistant to traditional processes employed in water treatment plants and are often detected after conventional treatments. In the last decades, bioremoval studies have obtained high interest. A microbial consortium with the ability to remove MCs under laboratory conditions was isolated from Rio de la Plata River (Argentina). This was able to remove 99.4 % of MC-LR in 7 days. A bacterium isolated from the consortium was able to remove 79.5 % of MCs. This bacterium, designated LG1, was identified as Achromobacter xylosoxidans. The time to reduce the initial concentration of clo-a by half (trm) was calculated by linear regression. The trm was 0.95 and 3.0 day for the consortium and LG1, respectively. In addition, the LG1 strain was able to remove in 7 days 43% and 25.9% of initial chlorophyll-a concentration produced by two Microcystis aeruginosa native strains. This was the first report of an indigenous bacterium belonging to the genus Achromobacter from Rio de la Plata River with removal capacity of MCs and chlorophyll-a.