Contributions of available substrates and activities of trophic microbial community to methanogenesis in vegetative and reproductive rice rhizospheric soil
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Author list: Chawanakul S., Chaiprasert P., Towprayoon S., Tanticharoen M.
Publisher: Pragati Press- India
Publication year: 2009
Journal: Journal of Environmental Biology (0254-8704)
Volume number: 30
Issue number: 1
Start page: 119
End page: 127
Number of pages: 9
ISSN: 0254-8704
Languages: English-Great Britain (EN-GB)
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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 ฑ 60 nmol g dw-1 d-1) compared with VP (510 ฑ 30 nmol g dw-1 d-1). The high number of AM showed the abundant (1.1ื104 cell g dw-1) with its high activity at RP, compared to the less activity with AM number at VP (9.8ื102 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. ฉ Triveni Enterprises, Lucknow (India).
Keywords
Acetoclastic methanogens, Rice rhizospheric soil, Trophic microbial consortium
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