Methanotrophs of the psychrophilic microbial community of the Russian Arctic Tundra

被引:29
作者
Berestovskaya, YY
Vasil'eva, LV
Chestnykh, OV
Zavarzin, GA
机构
[1] Russian Acad Sci, Inst Microbiol, Moscow 117312, Russia
[2] Russian Acad Sci, Ctr Forest Ecol & Prod, Moscow, Russia
关键词
psychrophily; methane oxidation; bacterial filter; greenhouse gases; microbial communities;
D O I
10.1023/A:1019805929529
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
In tundra, at a low temperature, there exists a slowly developing methanotrophic community. Methane-oxidizing bacteria are associated with plants growing at high humidity, such as sedge and sphagnum; no methanotrophs were found in polytrichous and aulacomnious mosses and lichens, typical of more and areas. The methanotrophic bacterial community inhabits definite soil horizons, from moss dust to peat formed from it. The potential ability of the methanotrophic community to oxidize methane at 5degreesC enhances with the depth of the soil profile in spite of the decreasing soil temperature. The methanotrophic community was found to gradually adapt to various temperatures due to the presence of different methane-oxidizing bacteria in its composition. Depending on the temperature and pH, different methanotrophs occupy different econiches. Within a temperature range from 5 to 15degreesC, three morphologically distinct groups of methanotrophs could be distinguished. At pH 5-7 and 5-15degreesC, forms morphologically similar to Methylobacter psychrophilus predominated, whereas at the acidic pH 4-6 and 10-15degreesC, bipolar cells typical of Methylocella palustris were mostly found. The third group of methanotrophic bacteria growing at pH 5-7 and 5-10degreesC was represented by a novel methanotroph whose large coccoid cells had a thick mucous capsule.
引用
收藏
页码:460 / 466
页数:7
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