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  • Title: Description and characterization of three endophytic Bacillaceae from the halophyte Suaeda salsa: Paenalkalicoccus suaedae gen. nov., sp. nov., Cytobacillus suaedae sp. nov., and Bacillus suaedae sp. nov.
    Author: Xu L, Huang XX, Wang HT, Tang SK, Shen B, Sun JQ.
    Journal: Int J Syst Evol Microbiol; 2022 May; 72(5):. PubMed ID: 35550242.
    Abstract:
    Three strains of members of the family Bacillaceae, which can inhibit the growth of some Gram-stain-positive strains, designated M4U3P1T, HD4P25T and RD4P76T, were isolated from Suaeda salsa halophytes in Baotou, Inner Mongolia, PR China. A phylogenetic analysis based on the 16S rRNA gene and the whole genome sequences revealed that HD4P25T clustered with Cytobacillus luteolus YIM 93174T with a similarity of 98.4 %, and RD4P76T shared the highest similarity of 16S rRNA gene with Bacillus mesophilus SA4T (97.5 %). M4U3P1T clustered with strains of genera Salipaludibacillus and Alkalicoccus based on whole-genome sequence analyses, but its 16S rRNA gene had the highest similarity to 'Evansella tamaricis' EGI 80668 (96.1 %). The average nucleotide's identity by blast (ANIb) and digital DNA-DNA hybridization (dDDH) values of the three isolated strains to their close relatives were well below the threshold value for identifying a novel species.On the basis of the phylogenetic, physiological and phenotypic results, Paenalkalicoccus suaedae gen. nov., sp. nov. [type strain M4U3P1T (=CGMCC 1.17076T=JCM 33851T)], Cytobacillus suaedae sp. nov. [type strain HD4P25T (=CGMCC 1.18651T =JCM 34524T)], and Bacillus suaedae sp. nov. [type strain RD4P76T (=CGMCC 1.18659T=JCM 34525T)] were proposed, respectively. All three species are ubiquitous in the bulk saline-alkaline soils, but only the species represented by strain RD4P76T was widely distributed in the rhizosphere soil, the above-ground part and the roots of S. salsa. The species represented by M4U3P1T can be detected in the roots of S. salsa, and rarely detected in the above-ground parts of S. salsa. The species represented by HD4P25T was rarely detected in the interior of S. salsa. The three strains could inhibit some of the Gram-stain-positive bacteria (i.e. members of the genera Planococcus, Zhihengliuella and Sanguibacter) in the saline-alkali soil. A genomic analysis of these three strains revealed that they can synthesize different antagonistic compounds, such as aminobenzoate and bacitracin or subtilisin.
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