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Fungi and macroaggregation in deep-sea sediments

DRS at CSIR-National Institute of Oceanography

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Title Fungi and macroaggregation in deep-sea sediments
 
Creator Damare, S.
Raghukumar, C.
 
Subject Fungal hyphae
Fungal biomass
deep-sea sediments
ethylenediamine tetra-acetic acid
 
Description Whereas fungi in terrestrial soils have been well studied, little is known of them in deep-sea sediments. Recent studies have demonstrated the presence of fungal hyphae in such sediments but in low abundance. We present evidence in this study that one of the apparent reasons for the poor detection of fungi in deep-sea sediments is their cryptic presence in macroaggregates. Fungal biomass carbon from different core sections of deep-sea sediments from approx. 5000 m depth in the Central Indian Ocean was estimated based on direct microscopic detection of fungal mycelia. Treatment of sediment samples with ethylenediamine tetra-acetic acid (EDTA) enabled more frequent detection and significantly higher biomass than in samples without such treatment. Treatment with EDTA resulted in detecting various stages of breakdown of aggregates in the sediments, gradually revealing the presence of fungal hyphae within them. Experimental studies of a deep-sea, as well as three terrestrial isolates of fungi, showed that all could grow at 200 bar and 5 degrees C in a nutrient medium and in deep-sea sediment extract. Hyphae of fungi grown in sediment extract under the above conditions showed various stages of accretion of particles around them, leading to the formation of aggregates. Such aggregates showed the presence of humic material, carbohydrate, and proteins. We suggest that fungi in deep-sea sediments may be involved in humic aggregate formation by processes very similar to those in terrestrial sediments. The importance of such a process in carbon sequestration and food web in the deep sea needs to be examined.
 
Date 2008-06-16T07:09:55Z
2008-06-16T07:09:55Z
2008
 
Type Journal Article
 
Identifier Microbial Ecology, vol.56(1); 168-177p.
http://drs.nio.org/drs/handle/2264/1091
 
Language en
 
Rights An edited version of this paper was published by Springer. This paper is for R & D pupose and Copyright [2008] Springer.
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Publisher Springer