Distribution of Mercury in Shrimp Ponds and Volatilization of Hg by Isolated Resistant Purple Nonsulfur Bacteria

Mukkata, Kanokwan; Kantachote, Duangporn; Wittayaweerasak, Banjong; Techkarnjanaruk, Somkiet; Megharaj, Mallavarapu; Naidu, Ravi

doi:10.1007/s11270-015-2418-2

Cited by 20 publications

(11 citation statements)

References 26 publications

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“…Purple nonsulphur bacteria are widely distributed in various aquatic habitats, such as fresh and marine water including sediments (Panwichian, Kantachote, Wittayaweerasak & Mallavarapu ; Mukkata et al . ). A greater number of PNSB were isolated from sediment samples; this might be because generally shrimp ponds are shallow and allow for light to penetrate to the sediment.…”

Section: Discussionmentioning

confidence: 97%

“…It is not surprising that our selected probiotic PNSB belonged to Rhodobacter and Afifella as both genera are marine PNSB and are frequently found in shrimp ponds (Mukkata et al . ).…”

Section: Discussionmentioning

confidence: 97%

“…They were used to isolate PNSB following the methods of Nunkaew, Kantachote, Nitoda and Kanzaki (); however, in this study BIM (basic isolation medium) (Brown ) was used instead of glutamate acetate (GA) medium. All the PNSB used were isolated from various shrimp ponds on both the coastal shorelines in the south of Thailand with the exception of strain STW181 that had been isolated previously in our laboratory (Mukkata, Kantachote, Wittayaweerasak, Techkarnjanaruk, Mallavarapu & Naidu ). The PNSB were grown in BIM except for strain STW181 that was grown in GA.…”

Section: Methodsmentioning

confidence: 99%

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In vitro and in vivo selection of probiotic purple nonsulphur bacteria with an ability to inhibit shrimp pathogens: acute hepatopancreatic necrosis disease-causing Vibrio parahaemolyticus and other vibrios

et al. 2016

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Shrimp cultivation has been faced with huge losses in productivity caused by infectious shrimp pathogenic vibrios, especially Vibrio parahaemolyticus that causes acute hepatopancreatic necrosis disease (AHPND). Hence, purple nonsulphur bacteria (PNSB) were isolated from shrimp ponds for investigating their abilities to control shrimp pathogenic Vibrio spp. and their use as probiotics for sustainable shrimp cultivation. Based on their probiotic properties, strains S3W10 and SS15 were selected because of their strong abilities to produce amylase, gelatinase and vitamin B12. However, only three PNSB strains (SS15, TKW17 and STW181) strongly inhibited V. harveyi_KSAAHRC and V. vulnificus_KSAAHRC including V. parahaemolyticus AHPND strains by secreting antivibrio compounds. Four selected PNSB also grew in the presence of pancreatic enzymes, and they were identified as Rhodobacter sphaeroides for strains S3W10, SS15 and TKW17 and Afifella marina for strain STW181. The effects of a mixed culture were also investigated as follows: T1 (S3W10 + SS15), T2 (S3W10 + TKW17) and T3 (S3W10 + STW181) on postlarval white shrimp (Litopenaeus vannamei) for 60 days by comparison with a control. All three probiotic PNSB sets significantly improved the digestive enzyme activities and shrimp growth with their proliferation in shrimp gastrointestinal tract although the shrimp survival was not significantly different. They also significantly reduced the cumulative mortality of shrimp exposed to a virulent AHPND strain (V. parahaemolyticus SR2). This is the first to conclude that selected probiotic PNSB strains have great potential to be used for shrimp cultivation to control vibrios including AHPND strains.

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Section: Discussionmentioning

confidence: 97%

“…It is not surprising that our selected probiotic PNSB belonged to Rhodobacter and Afifella as both genera are marine PNSB and are frequently found in shrimp ponds (Mukkata et al . ).…”

Section: Discussionmentioning

confidence: 97%

Section: Methodsmentioning

confidence: 99%

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In vitro and in vivo selection of probiotic purple nonsulphur bacteria with an ability to inhibit shrimp pathogens: acute hepatopancreatic necrosis disease-causing Vibrio parahaemolyticus and other vibrios

et al. 2016

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“…The presence of putative merA homologues in the genomes of some anoxygenic phototrophs (Mukkata et al 2015;Pérez et al 2018) highlights an interesting question regarding Hg tolerance in phototrophs: do cells preferentially detoxify Hg via cometabolic processes or through the use of dedicated reductases? Currently, it seems that phototrophic Hg reduction occurs mostly as a cometabolic process that relies on core metabolic machinery rather than mer-like determinants, which are largely absent in phototrophs.…”

Section: Phototrophic Mercury Reductionmentioning

confidence: 99%

Shining light on recent advances in microbial mercury cycling

Grégoire

Poulain

2018

FACETS

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Mercury (Hg) is a global pollutant emitted primarily as gaseous Hg0 that is deposited in aquatic and terrestrial ecosystems following its oxidation to HgII. From that point, microbes play a key role in determining Hg’s fate in the environment by participating in sequestration, oxidation, reduction, and methylation reactions. A wide diversity of chemotrophic and phototrophic microbes occupying oxic and anoxic habitats are known to participate directly in Hg cycling. Over the last few years, new findings have come to light that have greatly improved our mechanistic understanding of microbe-mediated Hg cycling pathways in the environment. In this review, we summarize recent advances in microbially mediated Hg cycling and take the opportunity to compare the relatively well-studied chemotrophic pathways to poorly understood phototrophic pathways. We present how the use of genomic and analytical tools can be used to understand Hg transformations and the physiological context of recently discovered cometabolic Hg transformations supported in anaerobes and phototrophs. Finally, we propose a conceptual framework that emphasizes the role that phototrophs play in environmental Hg redox cycling and the importance of better characterizing such pathways in the face of the environmental changes currently underway.

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“…For instance, Rhodopseudomonas palustris strains TN114 and PP803 produced exopolymeric substances and also 5‐aminolevulinic acid to reduce stress of NaCl on rice growth . Afifella marina and Rhodovulum sulfidophilum showed their potential for removal of mercury from shrimp ponds through biovolatilization . It is important for PNSB to have different physiological mechanisms to cope with As‐stress in order to utilize them for As‐bioremediation under various environmental conditions.…”

Section: Introductionmentioning

confidence: 99%

Arsenic resistance genes of As‐resistant purple nonsulfur bacteria isolated from As‐contaminated sites for bioremediation application

et al. 2017

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This study aimed to identify arsenic resistant mechanisms in As-resistant purple nonsulfur bacteria (PNSB) by screening them for presence of As-resistance genes and related enzymes. Resistance to As(III) and As(V) of four As-resistant PNSB determined in terms of median inhibition concentration (IC values) were in the order of strains Rhodopseudomonas palustris C1 > R. palustris AB3 > Rubrivivax benzoatilyticus C31 > R. palustris L28 which corresponded to the presence of As-resistance genes in these bacteria. The strain C1 showed all As-marker genes; arsC, arsM, aioA, and acr3, while aioA was not detected in strain AB3. Strains C31 and L28 had only Arsenite-transporter gene, acr3. Translation of all these detected gene sequences of strain C1 to amino acid sequences showed that these proteins have vicinal cysteine; Cys126, Cys105, and Cys178 of Acr3, ArsC, AioA, respectively. Tertiary structure of proteins Acr3, ArsC, AioA, and ArsM showed strain C1 exhibits the high activities of arsenite oxidase and arsenate reductase enzymes that are encoded by aioA and arsC genes, respectively. Moreover, strain C1 with arsM gene produced volatile-methylated As-compounds; monomethylarsonic acid (MMA), dimethylarsenic acid (DMA), and arsenobetaine (AsB) in the presence of either As(III) or As(V). In conclusion, the strain C1 has great potential for its application in bioremediation of As-contaminated sites.

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Distribution of Mercury in Shrimp Ponds and Volatilization of Hg by Isolated Resistant Purple Nonsulfur Bacteria

Cited by 20 publications

References 26 publications

In vitro and in vivo selection of probiotic purple nonsulphur bacteria with an ability to inhibit shrimp pathogens: acute hepatopancreatic necrosis disease-causing Vibrio parahaemolyticus and other vibrios

In vitro and in vivo selection of probiotic purple nonsulphur bacteria with an ability to inhibit shrimp pathogens: acute hepatopancreatic necrosis disease-causing Vibrio parahaemolyticus and other vibrios

Shining light on recent advances in microbial mercury cycling

Arsenic resistance genes of As‐resistant purple nonsulfur bacteria isolated from As‐contaminated sites for bioremediation application

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