Contributions of available substrates and activities of trophic microbial community to methanogenesis in vegetative and reproductive rice rhizospheric soil.
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Date
2009-01
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Abstract
Potential of methane production and trophic microbial activities at rhizospheric soil during rice cv. Supanburi 1 cultivation were
determined by laboratory anaerobic diluents vials. The methane production was higher from rhizospheric than non-rhizospheric soil, with the
noticeable peaks during reproductive phase (RP) than vegetative phase (VP). Glucose, ethanol and acetate were the dominant available
substrates found in rhizospheric soil during methane production at both phases. The predominance activities of trophic microbial consortium
in methanogenesis, namely fermentative bacteria (FB), acetogenic bacteria (AGB), acetate utilizing bacteria (AB) and acetoclastic
methanogens (AM) were also determined. At RP, these microbial groups were enhanced in the higher of methane production than VP. This
correlates with our finding that methane production was greater at the rhizospheric soil with the noticeable peaks during RP (1,150 ± 60
nmol g dw-1 d-1) compared with VP (510 ± 30 nmol g dw-1 d-1). The high number of AM showed the abundant (1.1x104 cell g dw-1) with its
high activity at RP, compared to the less activity with AM number at VP (9.8x102 cell g dw-1). Levels of AM are low in the total microbial
population, being less than 1% of AB. These evidences revealed that the microbial consortium of these two phases were different.
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Keywords
Acetoclastic methanogens, Methane production, Rice rhizospheric soil, Trophic microbial consortium
Citation
Chawanakul Sansanee, Chaiprasert Pawinee, Towprayoon Sirintornthep, Tanticharoen Morakot. Contributions of available substrates and activities of trophic microbial community to methanogenesis in vegetative and reproductive rice rhizospheric soil. Journal of Environmental Biology. 2009 Jan; 30(1): 119-127.