Although bacterial assemblages are important components of soils in arid ecosystems, the knowledge about composition, life-strategies, and environmental drivers is still fragmentary, especially in remote high-elevation mountains. We compared the quality and quantity of heterotrophic bacterial assemblages between the rhizosphere of the dominant cushion-forming plant Thylacospermum ceaspitosum and its surrounding bulk soil in two mountain ranges (East Karakoram: 4850-5250 m and Little Tibet: 5350-5850 m), in communities from cold steppes to the subnival zone in Ladakh, arid Trans-Himalaya, northwest India. Bacterial communities were characterized by molecular fingerprinting in combination with culture-dependent methods. The effects of environmental factors (elevation, mountain range, and soil physico-chemical parameters) on the bacterial community composition and structure were tested by multivariate redundancy analysis and conditional inference trees. Actinobacteria dominate the cultivable part of community and represent a major bacterial lineage of cold desert soils. The most abundant genera were Streptomyces, Arthrobacter, and Paenibacillus, representing both r- and K-strategists. The soil texture is the most important factor for the community structure and the total bacteria counts. Less abundant and diverse assemblages are found in East Karakoram with coarser soils derived from leucogranite bedrock, while more diverse assemblages in Little Tibet are associated with finer soils derived from easily weathering gneisses. Cushion rhizosphere is in general less diverse than bulk soil, and contains more r-strategists. K-strategists are more associated with the extremes of the gradient, with drought at lowest elevations (4850-5000 m) and frost at the highest elevations (5750-5850 m). The present study illuminates the composition of soil bacterial assemblages in relation to the cushion plant T. ceaspitosum in a xeric environment and brings important information about heterotrophic bacteria in Himalayan soil.

Department of Botany Faculty of Science University of South Bohemia České Budějovice Czech Republic

Department of Phycology Ecology Institute of Botany Academy of Sciences of the Czech Republic v v i Třeboň Czech Republic ; Department of Botany Faculty of Science University of South Bohemia České Budějovice Czech Republic

Department of Phycology Ecology Institute of Botany Academy of Sciences of the Czech Republic v v i Třeboň Czech Republic ; Department of Microbial Water Ecology Biology Centre Academy of Sciences of the Czech Republic v v i Institute of Hydrobiology Ceske Budejovice Czech Republic

Department of Soil Microbiology and Soil Chemistry Biology Centre Academy of Sciences of the Czech Republic v v i Institute of Soil Biology České Budějovice Czech Republic

Faculty Hospital and Faculty of Medicine Institute of Clinical Microbiology Charles University Hradec Králové Czech Republic ; National Reference Laboratory for Pathogenic Actinomycetes Department of Medical Microbiology and Immunology Regional Hospital Trutnov Inc Trutnov Czech Republic

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