Differential sensitivity of pigmented and non-pigmented marine bacteria to metals and antibiotics

Nair, Shanta; Chandramohan, D.; Bharathi, P. A. Loka

doi:10.1016/0043-1354(92)90042-3

Cited by 35 publications

(24 citation statements)

References 16 publications

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“…The studies carried out by Mudryk (2005) along the southern Baltic Sea, De Souza et al (2006) in Antarctic marine waters and Nair et al (1992) in different regions of the Arabian Sea showed that pigmented bacteria were more resistant to antibiotics than non-pigmented ones, in contrast to this Mudryk and Skorczewski (1998) reported more resistant of non pigmented ones. However in the present study we could not able to get any such characteristic relationship.…”

Section: Discussionmentioning

confidence: 86%

“…They were most resistant to nalidixic acid, novobiocin and penicillin and most sensitive to gentamycin and streptomycin. This is not surprising since the intrinsic resistance of many marine bacteria to antibiotics is well documented (Nair et al, 1992;Sabry et al, 1997;Mudryk and Skorczewski, 1998). Chandrasekaran et al (1998) and Tendencia and Pena (2001), such a high level of antibiotic resistance in marine bacteria might result from terrestrial bacteria with antibiotic resistant plasmids entering the seawater; this fact may be responsible for the observed prevalence of resistance genes in the marine environment.…”

Section: Discussionmentioning

confidence: 99%

“…This is why many studies have been recently carried out to determine the distribution of antibiotic resistance bacteria in freshwater basins, estuaries, municipal drinking water and sewage waters (Niemi et al, 1983;Calomiris et al, 1984;Jones et al, 1991;Herwig et al, 1997;Ash et al, 2002;Mudryk, 2002). However, relatively very few studies on antibiotic resistance bacteria in marine water (Nair et al, 1992;Mudryk and Skorczewski, 1998) and only very less studies have been undertaken in dynamic ecosystem such as mangrove environment. Therefore, the present study was carried out to determine the physico-chemical characteristics of water and sediment samples and isolation and identification of antibiotic resistance bacteria from Muthupettai mangroves so as to understand their interrelationship and spatial and temporal distribution patterns.…”

Section: Introductionmentioning

confidence: 99%

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RETRACTED: Occurrence and Seasonal Distribution of Antibiotic Resistance Heterotrophic Bacteria and Physico-chemical Characteristics of Muthupettai Mangrove Environment, Southeast Coast of India

Manivasagan¹,

Rajaram²,

Ramesh³

et al. 2011

J. of Environmental Science and Technology

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A study on antibiotic resistance of heterotrophic bacteria and physicochemical characteristics of water and sediment in mangrove environment of Muthupettai, Southeast coast of India was carried out during April 2006 -March 2007. Six stations in and around the mangrove sites were selected for sampling and the following parameters were recorded at monthly intervals temperature, pH, salinity, dissolved oxygen, nitrite, nitrate, total nitrogen, inorganic phosphate, total phosphorus, ammonia, silicate and total organic carbon. The levels of resistance of bacterial to various antibiotics differed considerably. Antibiotic resistance heterotrophic bacteria strains (six hundred and eighty) were isolated from mangrove environment and identified. Bacteria which inhabiting an aquaculture pond area of the mangrove and the station 2 were most resistant; the least resistant bacteria were isolated from the station 6, i.e., open sea. Generally, there was no significant difference in antibiotic resistance between pigmented and non-pigmented bacteria. When compared to nutrient distribution, water nutrients were consistently higher in the mangrove environment. Partially treated aquaculture waste water is having additional sources of nutrients. Although, the mangrove habitat has been demonstrated to possess self-cleaning properties, data obtained warms possible anthropogenic pollution in the mangrove area in near future if the present conditions prevailed for a long period.

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Section: Discussionmentioning

confidence: 86%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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RETRACTED: Occurrence and Seasonal Distribution of Antibiotic Resistance Heterotrophic Bacteria and Physico-chemical Characteristics of Muthupettai Mangrove Environment, Southeast Coast of India

Manivasagan¹,

Rajaram²,

Ramesh³

et al. 2011

J. of Environmental Science and Technology

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“…The production of pigmentation in all bacterial strains was also detected during the selection process both in LB agar and LB broth media. Nair et al (1992) and Arrage et al (1993) demonstrated that pigmentation by EPS-producing bacteria was related to resistance in these bacteria against toxic substances in contaminated water. Note: PP1 (isolated from soil sample collected from arid region of Ghotki Sindh).…”

Section: Discussionmentioning

confidence: 99%

Role of plant growth-promoting rhizobacteria and their exopolysaccharide in drought tolerance of maize

Naseem

Bano

2014

Journal of Plant Interactions

327

128

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The present study deals with the isolation and characterization of exopolysaccharides (EPS) produced by the plant growth-promoting rhizobacteria (PGPR) from arid and semiarid regions of Pakistan, and to investigate the drought tolerance potential of these PGPR on maize when used as bioinoculant alone and in combination with their respective EPS. Three bacterial strains Proteus penneri (Pp1), Pseudomonas aeruginosa (Pa2), and Alcaligenes faecalis (AF3) were selected as EPS-producing bacteria on the basis of mucoid colony formation. All these strains were gram negative, motile, and positive for catalase. Strain Pp1 was positive for oxidase test and was phosphate solubilizing, while Pa2 and AF3 were negative. The isolated strains were sequenced using 16SrRNA. Total soluble sugar, protein, uronic acid, emulsification activity, and Fourier-transformed infrared spectroscopy of EPS were determined. Drought stress had significant adverse effects on growth of maize seedlings. Seed bacterization of maize with EPS-producing bacterial strains in combination with their respective EPS improved soil moisture contents, plant biomass, root and shoot length, and leaf area. Under drought stress, the inoculated plants showed increase in relative water content, protein, and sugar though the proline content and the activities of antioxidant enzymes were decreased. The Pa2 strain isolated from semiarid region was most potent PGPR under drought stress. Consortia of inocula and their respective EPS showed greater potential to drought tolerance compared to PGPR inocula used alone.

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“…Similarly, our knowledge of the sensitivity of environmental isolates to antibiotics is more limited than our knowledge of production of antibiotics. Classical antibiotics (e.g., penicillin and kanamycin) have different levels of inhibition with pigmented and nonpigmented marine bacteria (35). Plasmids carrying genes for resistance to antibiotics have been found in marine Vibrio species and are thought to be laterally exchanged (31).…”

mentioning

confidence: 99%

Antagonistic Interactions among Marine Pelagic Bacteria

Long

Azam

2001

Appl Environ Microbiol

343

281

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Recent studies suggest that bacterial abundance and species diversity in the ocean's water column are variable at the millimeter scale, apparently in response to the small-scale heterogeneity in the distribution of organic matter. We hypothesized that bacterium-bacterium antagonistic interactions may contribute to variations in community structure at the microscale. We examined each of the 86 isolates for their inhibition of growth of the remaining 85 isolates by the Burkholder agar diffusion assay. More than one-half of the isolates expressed antagonistic activity, and this trait was more common with particle-associated bacteria than with free-living bacteria. This was exemplified by members of the ␣ subclass of the class Proteobacteria (␣-proteobacteria), in which production of antagonistic molecules was dominated by attached bacteria. We found that ␥-proteobacteria (members of the orders Alteromonadales and Vibrionales) are the most prolific producers of inhibitory materials and also the most resilient to them, while members of the Bacteriodetes were the organisms that were least productive and most sensitive to antagonistic interactions. Widespread interspecies growth inhibition is consistent with the role of this phenomenon in structuring bacterial communities at the microscale. Furthermore, our results suggest that bacteria from pelagic marine particles may be an underutilized source of novel antibiotics.

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Differential sensitivity of pigmented and non-pigmented marine bacteria to metals and antibiotics

Cited by 35 publications

References 16 publications

RETRACTED: Occurrence and Seasonal Distribution of Antibiotic Resistance Heterotrophic Bacteria and Physico-chemical Characteristics of Muthupettai Mangrove Environment, Southeast Coast of India

RETRACTED: Occurrence and Seasonal Distribution of Antibiotic Resistance Heterotrophic Bacteria and Physico-chemical Characteristics of Muthupettai Mangrove Environment, Southeast Coast of India

Role of plant growth-promoting rhizobacteria and their exopolysaccharide in drought tolerance of maize

Antagonistic Interactions among Marine Pelagic Bacteria

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