An aerobic, Gram-stain-negative, non-sporulating, flagellated and spindle-like bacterium, designated HY14T, was isolated from a pickle-processing factory wastewater sample. The isolate chemoheterotrophically grew at 4–42 °C (optimum, 35 °C) and pH 5.5–9.0 (optimum, pH 6.0–6.5). Salt was required for growth (0.5–12 % NaCl, w/v). A deep brown and water-soluble uncharacterized pigment was produced when grown in certain media. The predominant fatty acids (>5 %) included C16 : 0, C18 : 1 ω7c, 11-methyl C18 : 1 ω7c and C19 : 0 cyclo ω8c. The polar lipid profile consisted of diphosphatidylglycerol, phosphatidylglycerol, phosphatidylcholine, two unidentified aminolipids, two unidentified phospholipids, two unidentified glycolipids and five unknown lipids. The major isoprenoid quinone was ubiquinone-10. Pairwise alignment based on 16S rRNA gene sequences indicated that strain HY14T had the highest sequence similarity to genera Maritimibacter (95.61–96.05 %) and Boseongicola (95.82 %). Phylogenetic analysis based on core genome illustrated that strain HY14T formed a monophyletic lineage with members of the genus Maritimibacter in the clade of the Roseobacter group in the family Rhodobacteraeceae. The core-gene average amino acid identity used to define bacterial genera by a threshold of 60–80 % was calculated to be 68.56–76.5 % between HY14T and closely related taxa. Several genomic characteristics, such as carrying two RuBisCO-mediated pathways and different osmoprotectant transport pathways, exhibited the genotypic discrepancies of strain HY14T. Based on the polyphasic taxonomic characterization, strain HY14T is considered to represent a novel species of a novel genus belonging to the family Rhodobacteraeceae, for which the name Muriiphilus fusiformis gen. nov., sp. nov. is proposed. The type strain is HY14T (=CGMCC 1.15973T=KCTC 52499T). Maritimibacter lacisalsi (Zhong et al. 2015) is considered to diverge from Maritimibacter alkaliphilus at the genus level, and should be reassigned as a novel genus, for which the name Muriicola lacisalsi gen. nov., comb. nov. is proposed.
In the published version of the article, the name of Muriicola gen. nov. was illegitimate, as it is a later homonym of Muriicola Kahng et al. 2010 which belongs to the family Flavobacteriaceae. Alternative names for Muriicola and Muriicola lacisalsi are proposed and the associated description sections are re-printed below: DESCRIPTION OF SINISALIBACTER GEN. NOV. Sinisalibacter ( Si. ni. sa. li. bac'ter. N.L. fem. pl. n. Sinae China; L. masc. n. sal, salis salt; N.L. masc. n. bacter a rod; N.L. masc. n. Sinisalibacter a salted rod from China).Cells are aerobic, Gram-stain-negative, non-flagellated and rod-shaped. Catalase and oxidase are positive. The predominant fatty acids (>5 %) include C 16 : 0 , C 18 : 1 ω7c, 11-methyl C 18 : 1 ω7c and C 19 : 0 cyclo ω8c. The polar lipid profile is composed of diphosphatidylglycerol, phosphatidylglycerol, phosphatidylcholine, an unidentified aminolipids, an unidentified phospholipid, three unidentified glycolipids and an unknown lipid. The major isoprenoid quinone is ubiquinone-10. A member of the family Rhodobacteraceae, order Rhodobacterales according to phylogenomics. The type species is Sinisalibacter lacisalsi. DESCRIPTION OF SINISALIBACTER LACISALSI COMB. NOV.Sinisalibacter lacisalsi ( la. ci. sal'si. L. masc. n. lacus lake; L. masc. adj. salsus salted; N.L. gen. n. lacisalsi of a salt lake, the habitat from which the type strain was isolated).Basonym: Maritimibacter lacisalsi Zhong et al. 2015.The following properties supplement the genus description and are basically the same as for M. lacisalsi (Zhong et al. 2015) except for some supplements and emendations as follows.No hydrolysis of CM-cellulose, DNA, pectin, skimmed milk or xylan. Negative in methyl red and Voges-Proskauer tests. Grows on Luria-Bertani agar, nutrient agar and Reasoner's 2A agar, but not on centrimide agar or MacConkey agar, all of which contain NaCl up to 20 g l −1 . In ATB 32GN tests, 2-keto-gluconate and valerate are assimilated. In API 20NE tests, positive for nitrate reduction, hydrolysis of aesculin and assimilation of adipic acid, maltose and potassium gluconate. In API ZYM tests, activity of naphthol-AS-BI-phosphohydrolase is variable. In API 50CH tests, acid is produced from ᴅarabinose, ʟ-arabinose, ᴅarabitol, cellobiose, aesculin, ᴅ-fructose, ᴅ-fucose, ʟ-fucose, ᴅ-galactose, ᴅ-glucose, glycerol, lactose, maltose, ᴅ-mannose, ᴅ-mannitol, potassium 5-ketogluconate, sucrose, salicin, ᴅ-sorbitol, ᴅ-turanose and ᴅ-xylose. Resistance to norfloxacin (10 µg), streptomycin sulphate (10 µg) and tetracycline (30 µg) is variable.
Ralstonia solanacearum species complex (RSSC) contains a group of destructive plant pathogenic bacteria, causing bacterial wilt of over 200 species of crops and trees, such as Casuarina equisetifolia, worldwide. RSSC can survive in the soil environment for a long time and start infection after activated by host plants. This study conducted a transcriptome analysis on the expression pattern of the pathogenicity-related genes of a new isolated RSSC strain YQ (Ralstonia pseduosolanacearum phylotype I-16) in response to C. equisetifolia cladophyll (a branch of a stem that resembles and functions as a leaf) and root debris under in vitro culture. The cladophyll debris induced more genes upregulated than the root debris, including pathogenicity-related genes involved in motility, effectors, type III secretion systems, quorum sensing, and plant cell wall degradation. Besides, many differentially expressed genes were related to transcriptional regulator such as cyclic dimeric guanosine monophosphate. Moreover, the cultures with cladophyll debris induced a faster wilting in bioassays, and the cell swimming was enhanced by cladophyll exudate. C. equisetifolia cladophylls could activate the expression of pathogenicity-related genes of strain YQ and accelerate infection. Our findings suggest that litterfall management in C. equisetifolia forests, or even other plantations, should receive attention to prevent the induction of bacterial wilt disease caused by RSSC.
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