Open AccessAllorhizobium terrae sp. nov., isolated from paddy soil, and reclassification of Rhizobium oryziradicis (Zhao et al. 2017) as Allorhizobium oryziradicis comb. nov.
Author(s) -
Shih-Yao Lin,
Asif Hameed,
Hsin-I Huang
Publication year - 2020
Publication title -
international journal of systematic and evolutionary microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.925
H-Index - 173
eISSN - 1466-5034
pISSN - 1466-5026
DOI - 10.1099/ijsem.0.003770
Subject(s) - biology , rhizobium , botany , bacteria , genetics
A polyphasic taxonomic approach was used to characterize a nitrogen-fixing bacterium, designated strain CC-HIH110 T , isolated from paddy soil in Taiwan. Cells of strain CC-HIH110 T were Gram-stain-negative, rod-shaped, motile with polar flagella, catalase-positive and oxidase-positive. Optimal growth occurred at 30 °С, pH 7 and 1 % NaCl. Phylogenetic analyses based on 16S rRNA genes revealed a distinct taxonomic position attained by strain CC-HIH110 T associated with Rhizobium oryziradicis (98.4 % sequence identity), Allorhizobium vitis (97.8 %), Allorhizobium taibaishanense (97.7 %) and Allorhizobium undicola (96.0 %), and lower sequence similarity to other species. Average nucleotide identity (ANI) and digital DNA-DNA hybridization (dDDH) values between strain CC-HIH110 T and the type strains of other closely related species were 71.5-88.6 % and 19.6-35.5 %, respectively. Strain CC-HIH110 T contained C 16 : 0 3-OH, C 14 : 0 3-OH/iso C 16 : 1 I and C 18 : 1 ω 7 c /C 18 : 1 ω 6 c as the predominant fatty acids. The polar lipid profile consisted of diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine, phosphatidylmonomethylethanolamine, phosphatidyldimethylethanolamine, phosphatidylcholine, three unknown aminophospholipids, two unknown phospholipids and an unknown lipid. The major polyamine was homospermidine. The DNA G+C content was 55.0 mol% and the predominant quinone was ubiquinone (Q-10). Based on its distinct phylogenetic, phenotypic and chemotaxonomic traits together with results of comparative 16S rRNA gene sequence, ANI and dDDH analyses, strain CC-HIH110 T is proposed to represent a novel Allorhizobium species, for which the name Allorhizobium terrae sp. nov. (type strain CC-HIH110 T =BCRC 80932 T =JCM 31228 T ). In addition, Rhizobium oryziradicis is reclassified as Allorhizobium oryziradicis (type strain N19 T =ACCC 19962 T =KCTC 52413 T ) comb. nov.