期刊
ARCHIVES OF MICROBIOLOGY
卷 203, 期 7, 页码 3839-3849出版社
SPRINGER
DOI: 10.1007/s00203-021-02362-y
关键词
Trifolium sp; Diversity; Rhizobia; Non-rhizobia endophyte; Mine soil
类别
资金
- Ministry of Higher Education and Scientific Research of Algeria
High concentrations of heavy metals in mine soil lead to select strains adapted to specific conditions, disrupting the interactions between legumes and microorganisms. The diversity of strains isolated from Trifolium sp. nodules grown on Pb-Zn mine soil in Algeria showed predominance of non-rhizobial endophytes, with only rhizobial strains affiliated to the Rhizobium genus obtained. Furthermore, a yeast strain identified as Rhodotorula mucilaginosa was isolated, showing potential for further symbiotic studies.
High concentrations of heavy metals in mine soil disturb the interactions between legumes and microorganisms leading to select strains adapted to these specific conditions. In this work, we analyzed the diversity of fifty strains isolated from Trifolium sp. nodules growing on Pb-Zn mine soil, in the Northeastern of Algeria and highlighted their potential symbiotic traits. The phylogeny of the 16S rRNA gene sequences revealed a high bacterial diversity with a predominance of non-rhizobial endophytes. The identified isolates belong to the thirteen following genera Cupriavidus, Pseudomonas, Bacillus, Acinetobacter, Enterobacter, Roseomonas, Paracoccus, Frondihabitans, Microbacterium, Kocuria, Providencia, Micrococcus and Staphylococcus. Regarding rhizobial strains, only isolates affiliated to Rhizobium genus were obtained. The symbiotic gene nodC and the nitrogen fixation gene nifH present showed that Rhizobium isolates belonged to the symbiovar trifolii. In addition to bacterial, one yeast strain was isolated and identified as Rhodotorula mucilaginosa by sequencing the internal transcribed spacer (ITS) region.
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