Cadmium Tolerance by Haloarchaeal Strains Isolated from Solar Salterns of Goa, India

Chaudhary, Adit; Pasha, M Imran; Salgaonkar, Bhakti B.; Bragança, Judith M.

doi:10.7763/ijbbb.2014.v4.299

Cited by 8 publications

(5 citation statements)

References 13 publications

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“…The tolerance to cadmium was followed by the lower intensity of pigmentation; and in high concentrations of Cd 2+ , orange pigmentation turned to cream or white. Changes in pigment intensity in haloarchaea in the presence of heavy metals were reported by other investigators as well [19,32,35].…”

Section: Discussionsupporting

confidence: 68%

Toxic heavy metal/oxyanion tolerance in haloarchaea from some saline and hypersaline ecosystems

et al. 2023

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Toxic heavy metal/oxyanion contamination has increased severely through the last decades. In this study, 169 native haloarchaeal strains were isolated from different saline and hypersaline econiches of Iran. After providing pure culture and performing morphological, physiological, and biochemical tests, haloarchaea resistance toward arsenate, selenite, chromate, cadmium, zinc, lead, copper, and mercury were surveyed using an agar dilution method. On the basis of minimum inhibitory concentrations (MICs), the least toxicities were found with selenite and arsenate, while the haloarchaeal strains revealed the highest sensitivity for mercury. On the other hand, the majority of haloarchaeal strains exhibited similar responses to chromate and zinc, whereas the resistance level of the isolates to lead, cadmium, and copper was very heterogeneous. 16 S ribosomal RNA (rRNA) gene sequence analysis revealed that most haloarchaeal strains belong to the Halorubrum and Natrinema genera. The obtained results from this study showed that among the identified isolates, Halococcus morrhuae strain 498 had an exceptional resistance toward selenite and cadmium (64 and 16 mM, respectively). Also, Halovarius luteus strain DA5 exhibited a remarkable tolerance against copper (32 mM). Moreover, strain Salt5, identified as Haloarcula sp., was the only strain that could tolerate all eight tested heavy metals/oxyanions and had a significant tolerance of mercury (1.5 mM).

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Section: Discussionsupporting

confidence: 68%

Toxic heavy metal/oxyanion tolerance in haloarchaea from some saline and hypersaline ecosystems

et al. 2023

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“…They also described the intracellular synthesis of selenium nanoparticles (SeNPs) by the haloarchaeon Halococcus salifodinae BK18, when the cells were grown in the presence of sodium selenite. Also, cadmium tolerance has been reported in haloarcheal strains from solar salterns of Ribandar and Siridao in India [73].…”

Section: Halophilic Archaea In Bioremediation Of Heavy Metal Ionmentioning

confidence: 97%

New Uses of Haloarchaeal Species in Bioremediation Processes

Bonete¹,

Bautista²,

Esclapez³

et al. 2015

Advances in Bioremediation of Wastewater and Polluted Soil

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The extreme conditions under which haloarchaea survive make them good bioremediation agents in water treatment processes and in saline and hypersaline environments contaminated with toxic compounds such as nitrate, nitrite and ammonia, chlorine compounds such as perchlorate and chlorate, heavy metals, and aromatic compounds. New advances in the understanding of haloarchaea metabolism, biochemistry, and molecular biology suggest that general biochemical pathways related to nitrogen Nitrogen cycle , metals iron, mercury , hydrocarbons, or phenols can be used for bioremediation proposals.The main goal of the chapter is to present a review about the main characteristics of the archaeal species and their possible uses for bioremediation processes paying special attention to the Halobacteriaceae family. Several examples about the role of these microorganisms in salty brines or soils with high concentrations of nitrogenous compounds, heavy metals, aliphatic or aromatic hydrocarbons, or oxyanions are also discussed.

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“…More recent studies on haloarchaeal isolates belonging to Haloferax, Halococcus, Halorubrum, and Haloarcula genera revealed a similar resistance pattern as previously reported by Nieto, with Haloferax BBK2 and Halococcus BK6 strains showing the highest tolerance (MIC 0.5 mM) to Cd 2+ and Zn 2+ . However, maximum Cd 2+ and Zn 2+ concentrations supporting growth (4 and 2 mM, respectively) were only observed on complex NTYE agar medium [117,118]. In the case of.…”

Section: Haloarchaea As Model Organisms For Bioremediation Of Heavy Metals Contaminated Sites: the Case Of Cadmiummentioning

confidence: 99%

“…Intracellular accumulation of cadmium, probably as CdS nanoparticles, may be part of the Cd-resistance strategy in Haloferax BBK2 [60]. An important feature observed during the growth of haloarchaea in the presence of metal was related to cellular pigmentation (the highest the cadmium concentration the lower intensity of pigmentation), so the carotenogenesis in haloarchaea is clearly affect by the presence of heavy metals [118]. To the best of our knowledge the study caried out on cadmium resistance in Haloferax strain BBK2 in the only one conducted up to now into detail.…”

Section: Haloarchaea As Model Organisms For Bioremediation Of Heavy Metals Contaminated Sites: the Case Of Cadmiummentioning

confidence: 99%

Insights on Cadmium Removal by Bioremediation: The Case of Haloarchaea

Vera-Bernal

Martínez‐Espinosa

2021

Microbiology Research

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Although heavy metals are naturally found in the environment as components of the earth’s crust, environmental pollution by these toxic elements has increased since the industrial revolution. Some of them can be considered essential, since they play regulatory roles in different biological processes; but the role of other heavy metals in living tissues is not clear, and once ingested they can accumulate in the organism for long periods of time causing adverse health effects. To mitigate this problem, different methods have been used to remove heavy metals from water and soil, such as chelation-based processes. However, techniques like bioremediation are leaving these conventional methodologies in the background for being more effective and eco-friendlier. Recently, different research lines have been promoted, in which several organisms have been used for bioremediation approaches. Within this context, the extremophilic microorganisms represent one of the best tools for the treatment of contaminated sites due to the biochemical and molecular properties they show. Furthermore, since it is estimated that 5% of industrial effluents are saline and hypersaline, halophilic microorganisms have been suggested as good candidates for bioremediation and treatment of this kind of samples. These microorganisms, and specifically the haloarchaea group, are of interest to design strategies aiming the removal of polluting compounds due to the efficiency of their metabolism under extreme conditions and their significant tolerance to highly toxic compounds such as heavy metals, bromate, nitrite, chlorate, or perchlorate ions. However, there are still few trials that have proven the bioremediation of environments contaminated with heavy metals using these microorganisms. This review analyses scientific literature focused on metabolic capabilities of haloarchaea that may allow these microbes to tolerate and eliminate heavy metals from the media, paying special attention to cadmium. Thus, this work will shed light on potential uses of haloarchaea in bioremediation of soils and waters negatively affected by heavy metals, and more specifically by cadmium.

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Cadmium Tolerance by Haloarchaeal Strains Isolated from Solar Salterns of Goa, India

Cited by 8 publications

References 13 publications

Toxic heavy metal/oxyanion tolerance in haloarchaea from some saline and hypersaline ecosystems

Toxic heavy metal/oxyanion tolerance in haloarchaea from some saline and hypersaline ecosystems

New Uses of Haloarchaeal Species in Bioremediation Processes

Insights on Cadmium Removal by Bioremediation: The Case of Haloarchaea

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