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Genome-based classification of genera Halosegnis and Salella, and description of four novel halophilic archaea isolated from a tidal flat
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Genome-based classification of genera Halosegnis and Salella, and description of four novel halophilic archaea isolated from a tidal flat
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Journal Article
Genome-based classification of genera Halosegnis and Salella, and description of four novel halophilic archaea isolated from a tidal flat
2024
Overview
The current species of
Halosegnis
and
Salella
within the class
Halobacteria
are closely related based on phylogenetic, phylogenomic, and comparative genomic analyses. The
Halosegnis
species showed 99.8–100.0% 16S rRNA and 96.6–99.6%
rpoB′
gene similarities to the
Salella
species, respectively. Phylogenetic and phylogenomic analyses showed that
Salella cibi
CBA1133
T
, the sole species of
Salella
, formed a single tight cluster with
Halosegnis longus
F12-1
T
, then with
Halosegnis rubeus
F17-44
T
. The average nucleotide identity (ANI), digital DNA–DNA hybridization (dDDH), and average amino acid identity (AAI) values between
Salella cibi
CBA1133
T
and
Halosegnis longus
F12-1
T
were 99.2, 94.2, and 98.6%, respectively, much higher than the thresholds for species demarcation. This genome-based classification revealed that the genus
Salella
should be merged with
Halosegnis
, and
Salella cibi
should be a later heterotypic synonym of
Halosegnis longus
. Halophilic archaeal strains DT72
T
, DT80
T
, DT85
T
, and DT116
T
, isolated from the saline soil of a tidal flat in China, were subjected to polyphasic taxonomic characterization. The phenotypic, chemotaxonomic, phylogenetic, and phylogenomic features indicated that strains DT72
T
(= CGMCC 1.18925
T
= JCM 35418
T
), DT80
T
(= CGMCC 1.18926
T
= JCM 35419
T
), DT85
T
(= CGMCC 1.19049
T
= JCM 35605
T
), and DT116
T
(= CGMCC 1.19045
T
= JCM 35606
T
) represent four novel species of the genera
Halorussus
,
Halosegnis
and
Haloglomus
, respectively, for which the names,
Halorussus caseinilyticus
sp. nov.,
Halorussus lipolyticus
sp. nov.,
Halosegnis marinus
sp. nov., and
Haloglomus litoreum
sp. nov., are proposed.
