1887

Abstract

Three microaerophilic bacterial strains, designated SG22, SG63 and SG29 were isolated from paddy soils in PR China. Cells of these strains were Gram-staining-negative and long rod-shaped. SG22, SG63 and SG29 showed the highest 16S rRNA gene sequence similarities with the members of the genus . The results of phylogenetic and phylogenomic analysis also indicated that these strains clustered with members of the genus . The main respiratory menaquinone of SG22, SG63 and SG29 was MK-8 and the major fatty acids were iso-C, iso-C and C. SG22, SG29 and SG63 not only possessed iron reduction ability but also harboured genes () encoding nitrogenase. The genomic DNA G+C contents of SG22, SG63 and SG29 ranged from 73.3 to 73.5 %. The average nucleotide identity (ANI) and digital DNA–DNA hybridisation (dDDH) values between SG22, SG63 and SG29 and the closely related species of the genus were lower than the cut-off values (dDDH 70 % and ANI 95–96 %) for prokaryotic species delineation. On the basis of these results, strains SG22, SG63 and SG29 represent three novel species within the genus , for which the names sp. nov., sp. nov. and sp. nov., are proposed. The type strains are SG22 (= GDMCC 1.3185 = JCM 35581), SG63 (= GDMCC 1.2914 = JCM 35124) and SG29 (= GDMCC 1.2911 = JCM 35123).

Funding
This study was supported by the:
  • Key project of science and Technology innovation in Fujian Province, China (Award 2022G02014)
    • Principle Award Recipient: LiuGuo-Hong
  • National Natural Science Foundation of China (Award 42177270)
    • Principle Award Recipient: YongYuan
  • Key Technology Research and Development Program of Shandong (Award 2021YFD1900400)
    • Principle Award Recipient: Qiu-EYang
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2024-02-07
2024-05-20
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