Mesorhizobium denitrificans sp. nov., a novel denitrifying bacterium isolated from sludge

Muhammad Zubair Siddiqi; Ngo Thi Phuong Thao; Gyumin Choi; Dae-Cheol Kim; Young-Woo Lee; Sang Young Kim; Ji-Hyang Wee; Wan-Taek Im

doi:10.1007/s12275-019-8590-0

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Mesorhizobium denitrificans sp. nov., a novel denitrifying bacterium isolated from sludge: Muhammad Zubair Siddiqi ^1,2, Ngo Thi Phuong Thao ³, Gyumin Choi ², Dae-Cheol Kim ¹, Young-Woo Lee ¹, Sang Young Kim ⁴, Ji-Hyang Wee ⁴, Wan-Taek Im ^1,2; Journal of Microbiology 2019;57(4):238-242.
DOI: https://doi.org/10.1007/s12275-019-8590-0
Published online: March 30, 2019

¹Department of Biotechnology, Hankyong National University, Anseong 17579, Republic of Korea, ²AceEMzyme Co., Ltd., Academic Industry Cooperation, Anseong 17579, Republic of Korea, ³M-ChET, KIOCA program, Hankyong National University, Anseong 17579, Republic of Korea, ⁴Department of Food Science & Bio Technology, Shinansan University, Ansan 15435, Republic of Korea¹Department of Biotechnology, Hankyong National University, Anseong 17579, Republic of Korea, ²AceEMzyme Co., Ltd., Academic Industry Cooperation, Anseong 17579, Republic of Korea, ³M-ChET, KIOCA program, Hankyong National University, Anseong 17579, Republic of Korea, ⁴Department of Food Science & Bio Technology, Shinansan University, Ansan 15435, Republic of Korea

Corresponding author: Wan-Taek Im , Tel: +82-31-6705335,

Received: 25 October 2018 • Revised: 22 November 2018 • Accepted: 22 November 2018

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Abstract

A Gram-stain-negative, non-spore-forming, facultative, rodshaped bacterium (designated LA-28T) was isolated from a sludge sample from a wastewater treatment plant in Hanam city, Republic of Korea. On the basis of 16S rRNA gene sequencing, strain LA-28T clustered with species of the genus Mesorhizobium and appeared closely related to M. jarvisii LMG 28313T (96.8%), M. waimense ICMP 19557T (96.7%), and M. huakuii LMG 14107T (96.7%). Growth occurs at 18– 40°C on R2A medium in the presence of 1–4% NaCl (w/v) and at pH 6–8. The DNA G+C content was 61.2 mol%, and the predominant quinone was ubiquinone-10 (Q-10). The major cellular fatty acids (> 5%) were C16:0, C19:0 ω8c cyclo, C18:1 ω7c 11-methyl, and C18:1 ω7c and/or C18:1 ω6c (summed feature 8). Major polar lipids were phosphatidylglycerol (PG), phosphatidylethanolamine (PE), phosphatidyl-N-methylethanolamine (PME), and phosphatidylcholine (PC). Physiological and biochemical characteristics indicated that strain LA-28T represents a novel species of the genus Mesorhizobium, for which the name Mesorhizobium denitrificans sp. nov. is proposed. The type strain is LA-28T (= KACC 19675T = LMG 30806T).

Keywords: Mesorhizobium denitrificans;16S rRNA gene sequence;polyphasic taxomony;sludge

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Mesorhizobium denitrificans sp. nov., a novel denitrifying bacterium isolated from sludge

J. Microbiol. 2019;57(4):238-242. Published online March 30, 2019

DOI: https://doi.org/10.1007/s12275-019-8590-0

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