Screening of Trichoderma isolates for their potential of biosorption of nickel and cadmium

Abstract

Fourteen Trichoderma isolates were evaluated for their tolerance to two heavy metals, nickel and cadmium. Three isolates, MT-4, UBT-18, and IBT-I, showed high levels of nickel tolerance, whereas MT-4, UBT-18, and IBT-II showed better tolerance of cadmium than the other isolates. Under nickel stress, biomass production increased up to a Ni concentration of 60 ppm in all strains but then decreased as the concentrations of nickel were further increased. Among the nickel-tolerant isolates, UBT-18 produced significantly higher biomass upon exposure to nickel (up to 150 ppm); however, the minimum concentration of nickel required to inhibit 50% of growth (MIC50) was highest in IBT-I. Among the cadmium-tolerant isolates, IBT-II showed both maximum biomass production and a maximum MIC50 value in cadmium stress. As the biomass of the Trichoderma isolates increased, a higher percentage of nickel removal was observed up to a concentration of 40 ppm, followed by an increase in residual nickel and a decrease in biomass production at higher nickel concentrations in the medium. The increase in cadmium concentrations resulted in a decrease in biomass production and positively correlated with an increase in residual cadmium in the culture broth. Nickel and cadmium stress also influenced the sensitivity of the Trichoderma isolates to soil fungistasis. Isolates IBT-I and UBT-18 were most tolerant to fungistasis under nickel and cadmium stress, respectively.

Cadmium biosorption from wastewater by Yarrowia lipolytica AUMC 9256

“…An increase in Cd(II) concentration led to a decrease in the biomass production and thereafter a rise in the residual Cd(II). The results of this study are in the line with the conclusions of Nongmaithem et al (2016) on Trichoderma isolates and Cd(II). Monovalent cations (H + , Na + /K + ) were stated to be associated with the ion exchange process due to a weak attachment with biomass as compared to divalent cations (Verma et al, 2008).…”

Enhanced Tolerance to Cadmium in Bacterial-Fungal Co-Cultures as a Strategy for Metal Biorecovery from e-Waste

“…However, this tolerance could not be extended to higher Cd concentrations for all the isolated strains. Nevertheless, isolations in metal-contaminated sites seem to be an effective way to collect microorganisms presenting metal tolerance and/or resistance mechanisms as demonstrated in this study and also by several other studies [58][59][60][61][62]. As a further example, a fungal strain that accumulates dysprosium (Dy), a rare earth element, could be isolated from an acidic environment containing high concentration of heavy metals [63].…”

“…The ability of Trichoderma species to tolerate heavy metals was also described by Nomgmaithem et al [61]. However, these authors suggest that, even though these fungi seem to be metal tolerant, in Cd-contaminated soil their population dynamics may be affected through reduced sporulation.…”

“…Some of those have been described in Trichoderma spp. [61]. For the investigation of particular metal-microbe interactions, understanding the form and which speciation of given metal is crucial.…”

Tratamento De Água Por Biossorção Utilizando Consórcio Bacteriano Do Solo

“…Inúmeros processos apresentam metais em seus efluentes. Se os metais estiverem acima dos níveis nutricionais permitidos, tornam-se tóxicos e a contaminação de solos por esses metais tem impacto na saúde humana (5,6). O níquel é um metal que gera preocupação devido sua acumulação e limites de descarte foram estipulados, devido aos efeitos tóxicos (7).…”