期刊
MICROBIOLOGICAL RESEARCH
卷 182, 期 -, 页码 68-79出版社
ELSEVIER GMBH
DOI: 10.1016/j.micres.2015.09.007
关键词
ACC deaminase; Dinitrogenase reductase; IAA; Phospholipid fatty acid analysis; Salinity; Siderophores
类别
资金
- National Science Centre (Poland) [DEC-2012/07/ B/NZ9/01801]
The submitted work assumes that the abundance and diversity of endophytic and rhizosphere microorganisms co-existing with the halophytic plant Aster tripolium L growing in a salty meadow in the vicinity of a soda factory (central Poland) represent unique populations of cultivable bacterial strains. Endophytic and rhizosphere bacteria were (i) isolated and identified based on 16S rDNA sequences; (ii) screened for nifH and acdS genes; and (iii) analyzed based on selected metabolic properties. Moreover, total microbial biomass and community structures of the roots (endophytes), rhizosphere and soil were evaluated using a cultivation-independent technique (PLFA) to characterize plant-microbial interactions under natural salt conditions. The identification of the isolated strains showed domination by Gram-positive bacteria (mostly Bacillus spp.) both in the rhizosphere (90.9%) and roots (72.7%) of A. tripolium. Rhizosphere bacterial strains exhibited broader metabolic capacities, while endophytes exhibited higher specificities for metabolic activity. The PLFA analysis showed that the total bacterial biomass decreased in the following order (rhizosphere < soil < endophytes) and confirmed the dominance of Gram-positive endophytic bacteria in the roots of the halophyte. The described strain collection provides a valuable basis for a subsequent applications of bacteria in improvement of site adaptation of plants in saline soils. (c) 2015 Elsevier GmbH. All rights reserved.
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