Journal
MICROBIOLOGICAL RESEARCH
Volume 194, Issue -, Pages 20-28Publisher
ELSEVIER GMBH
DOI: 10.1016/j.micres.2016.09.001
Keywords
HCN; Rhizobacteria; Pseudomonads; Alpine oligotrophic environment; Siderophores; Mineral weathering
Categories
Funding
- Slovenian Research Agency [L1-5446]
- Slovenian Agency for Entrepreneurship and Foreign Investment
- Government of the Russian Federation [14.Z50.31.0004]
- European Commission [282881]
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HCN producing bacteria have previously been isolated from alpine mineral soil and their ecophysiology was presumed to be associated with mineral weathering. Nevertheless, the high ecological patchiness of the alpine environment calls for an extensive and detailed analysis of the spatial distribution of HCN producing bacterial populations and their associated weathering traits. Our results of such an analysis showed that primarily the rhizosphere of pioneer plants was rich in HPPs, harbouring the most potent HCN producers. HCN production incidence and intensity were dependent on the plant-associated micro habitat and type of bedrock/mineral soil, however the HCN+ phenotype was not associated with one of the particular genotypes which we determined by BOX-PCR. In HPP isolates, HCN production most commonly co-occurred with the production of hydroxamate-type siderophores, but was less often associated with inorganic phosphate solubilization activity and the production of catechol-type siderophores. These observations indicate that a plant's physiotype, not species, provide physicochemical conditions that determine selective pressure, which enables the growth of Pseudomonas spp. with a random genotype, but phenotypically predetermined to increase mineral weathering via a particular combination of phosphate solubilization ana iron complexation with siderophores and HCN. (C) 2016 Elsevier GmbH. All rights reserved.
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