Methanogenic bacteria in mangrove sediments

Mohanraju, R.; Natarajan, R.

doi:10.1007/bf00008218

Cited by 14 publications

(7 citation statements)

References 25 publications

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“…The methanogens are characterized by their ability to produce methane from hydrogen and carbondioxide, formate, acetate, methanol etc [12]. Methanotrophs are a subset of a physiological group of bacteria known as methylotrophs.…”

Section: Introductionmentioning

confidence: 99%

Salt tolerant culturable microbes accessible in the soil of the Sundarban Mangrove forest, India

Das¹,

De²,

Ray³

et al. 2011

OJE

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Sundarban Mangrove forest is highly productive marine ecosystem where halophilic microbes actively participate in bio-mineralization and biotransformation of minerals. The population of aerobic halophilic microbes was studied to determine their distribution with the availability of different physicochemical parameters with increasing depth of this forest sediment. The present study revealed that microbes present in the top soil region were less tolerant to fluctuation in salinity than the middle and bottom segment. Microbes isolated from bottom segment showed higher growth rate in anaerobic condition. A decreasing trend of total microbial population and organic carbon content of soil were found with increase in depth. In contrary a reverse profile was found for salinity. A significant stratification was found to exist among microbial population and the salty nature of the soil of Sundarban Mangrove forest.

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Section: Introductionmentioning

confidence: 99%

Salt tolerant culturable microbes accessible in the soil of the Sundarban Mangrove forest, India

Das¹,

De²,

Ray³

et al. 2011

OJE

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“…The methanogens are characterized by their ability to produce methane from hydrogen and carbon di oxide, formate, acetate, methanol etc. [13]. Methanotrophs are a subset of a physiological group of bacteria known as methylotrophs.…”

Section: Introductionmentioning

confidence: 99%

Depth Integrated Microbial Community and Physico-Chemical Properties in Mangrove Soil of Sundarban, India

Das¹,

De²,

Ganguly³

et al. 2012

AiM

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In the Sundarban Mangrove forest microbial activities are dominantly involved in both the mineralization and decomposition processes that regulate nutrient profile in soil of different depth. It was found that besides changing the water and soil quality, monsoonal cycle plays a crucial role in regulating microbial population distribution in the mangrove soil. Statistical analyses revealed that organic carbon was the most significant factor that regulated the total microbial population. The cellulose degrading bacteria, [mean value of CFU 14.32 × 10 6 (gm dry weight of soil) -1 ] was dominant throughout the year. The sulfate reducing bacteria showed an increasing trend along depth with a minimum value at the surface i.e. 6.113 × 10 6 (gm dry weight of soil) -1 and 12.312 × 10 6 (gm dry weight of soil) -1 at a depth of 60 cm. Intensification of monsoonal cycle could heavily affect microbe dominated soil biogeochemistry and subsequent change in the regional ecology of the Sundarban Mangrove Forest.

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“…Among different substrates utilized by methanogens, marine methylated compounds, such as methanol and mono-, di-, or trimethylamines, are major substrates for methane production by methylotrophic methanogens. The primary sources of methylated compound substrates are the microbial decomposition of marine organisms or the root exudates of plants such as mangroves, Spartina alterniflora Loisel, and seagrasses ( Mohanraju and Natarajan, 1992 ; Lyimo et al, 2009 ; Sun et al, 2015 ; Yang et al, 2019 ; Zheng et al, 2019 ). These substrates are not routinely used by SRB in the presence of methanogens ( Lyimo et al, 2009 ), but promote the rapid growth of methylotrophic methanogens in sediments with high densities of seaweed.…”

Section: Introductionmentioning

confidence: 99%

Effects of Organic Phosphorus on Methylotrophic Methanogenesis in Coastal Lagoon Sediments With Seagrass (Zostera marina) Colonization

Zheng

Wang

et al. 2020

Front. Microbiol.

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Methanogens are the major contributors of greenhouse gas methane and play significant roles in the degradation and transformation of organic matter. These organisms are particularly abundant in Swan Lake, which is a shallow lagoon located in Rongcheng Bay, Yellow Sea, northern China, where eutrophication from overfertilization commonly results in anoxic environments. High organic phosphorus content is a key component of the total phosphorus in Swan Lake and is possibly a key factor affecting the eutrophication and carbon and nitrogen cycling in Swan Lake. The effects of organic phosphorus on eutrophication have been well-studied with respect to bacteria, such as cyanobacteria, unlike the effects of organic phosphorus on methanogenesis. In this study, different sediment layer samples of seagrass-vegetated and unvegetated areas in Swan Lake were investigated to understand the effects of organic phosphorus on methylotrophic methanogenesis. The results showed that phytate phosphorus significantly promoted methane production in the deepest sediment layer of vegetated regions but suppressed it in unvegetated regions. Amplicon sequencing revealed that methylotrophic Methanococcoides actively dominated in all enrichment samples from both regions with additions of trimethylamine or phytate phosphorus, whereas methylotrophic Methanolobus and Methanosarcina predominated in the enrichments obtained from vegetated and unvegetated sediments, respectively. These results prompted further study of the effects of phytate phosphorus on two methanogen isolates, Methanolobus psychrophilus , a type strain, Methanosarcina mazei , an isolate from Swan Lake sediments. Cultivation experiments showed that phytate phosphorus could inhibit methane production by M. psychrophilus but promote methane production by M. mazei . These culture-based studies revealed the effects of organic phosphorus on methylotrophic methanogenesis in coastal lagoon sediments and improves our understanding of the mechanisms of organic carbon cycling leading to methanogenesis mediated by organic phosphorus dynamics in coastal wetlands.

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Methanogenic bacteria in mangrove sediments

Abstract: The occurrence of methanogenic bacteria in the Kodiakkarai (

Cited by 14 publications

References 25 publications

Salt tolerant culturable microbes accessible in the soil of the Sundarban Mangrove forest, India

Salt tolerant culturable microbes accessible in the soil of the Sundarban Mangrove forest, India

Depth Integrated Microbial Community and Physico-Chemical Properties in Mangrove Soil of Sundarban, India

Effects of Organic Phosphorus on Methylotrophic Methanogenesis in Coastal Lagoon Sediments With Seagrass (Zostera marina) Colonization

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