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Applied and Environmental Microbiology, August 1999, p. 3526-3533, Vol. 65, No. 8
Max-Planck-Institut für terrestrische
Mikrobiologie,
Received 2 February 1999/Accepted 18 May 1999
Most-probable-number (MPN) counts were made of homoacetogenic and
other bacteria present in the anoxic flooded bulk soil of laboratory
microcosms containing 90- to 95-day-old rice plants. MPN counts with
substrates known to be useful for the selective enrichment or the
cultivation of homoacetogenic bacteria (betaine, ethylene glycol,
2,3-butanediol, and 3,4,5-trimethoxybenzoate) gave counts of 2.3 × 103 to 2.8 × 105 cells per g of dry
soil. Homoacetogens isolated from the terminal positive steps of these
dilution cultures belonged to the genus Sporomusa. Counts
with succinate, ethanol, and lactate gave much higher MPNs of 5.9 × 105 to 3.4 × 107 cells per g of dry
soil and led to the isolation of Desulfovibrio spp.
Counting experiments on lactate and ethanol which included Methanospirillum hungatei in the medium gave MPNs of
2.3 × 106 to 7.5 × 108 cells per g
of dry soil and led to the isolation of Sporomusa spp. The
latter strains could grow with betaine, ethylene glycol, 2,3-butanediol, and/or 3,4,5-trimethoxybenzoate, but apparently most
cells of Sporomusa spp. did not initiate growth in counting experiments with those substrates. Spores apparently accounted for
2.2% or less of the culturable bacteria. It appears that culturable Desulfovibrio spp. and Sporomusa spp. were
present in approximately equal numbers in the bulk soil. Multiple,
phylogenetically-distinct, phenotypically-different, strains of each
genus were found in the same soil system.
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Culturable Populations of Sporomusa spp.
and Desulfovibrio spp. in the Anoxic Bulk Soil of Flooded
Rice Microcosms
and
*
Corresponding author. Present address: Department of
Microbiology and Immunology, University of Melbourne, Parkville,
Victoria 3052, Australia. Phone: 61(3) 9344 5706. Fax: 61 (3) 9347 1540. E-mail:
p.janssen{at}microbiology.unimelb.edu.au.
Present address: Department of Biological Sciences, Louisiana State
University, Baton Rouge, LA 70803.
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