Rhizobium rhizophilum sp. nov., an indole acetic acid-producing bacterium isolated from rape (Brassica napus L.) rhizosphere soil

文献类型： 外文期刊

第一作者： Gao, Jun-lian

作者： Gao, Jun-lian;Wang, Li-wei;Xue, Jing;Sun, Yu-chen;Zhang, Xiuhai;Tong, Shuai;Sun, Jian-guang;Peng, Guixiang

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关键词： indole acetic acid producing bacterium; polyphasic taxonomy; rape (Brassica napus L.); Rhizobium rhizophilum

期刊名称：INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY （ 影响因子：2.747； 五年影响因子：2.889 ）

ISSN： 1466-5026

年卷期： 2020 年 70 卷 9 期

页码：

收录情况： SCI

摘要： A novel Gram-stain-negative, aerobic, rod-shaped and indole acetic acid-producing strain, designated 7209-2(T), was isolated from rhizosphere of rape (Brassica napus L.) grown in the Yakeshi City. Inner Mongolia, PR China. The 165 rRNA gene sequence analysis indicated that strain 7209-2(T) belongs to the genus Rhizobium and is closely related to Rhizobium rosettiformans W3(T), Rhizobium ipomoeae shin9-1(T) and Rhizobium wuzhouense W44(T) with sequence similarities of 98.2, 98.1 and 97.9%, respectively. Phylogenetic analysis based on concatenated housekeeping recA and atpD gene sequences showed that strain 7209-2(T) formed a group together with R. wuzhouense W44(T) and R. rosettiformans W3(T), with sequences similarities of 92.6 and 91.1%, respectively. The genome size of strain 7209-2(T) was 5.25 Mb, comprising 5027 predicted genes with a DNA G+C content of 61.2mol%. The average nucleotide identity and digital DNA-DNA hybridization comparisons among 7209-2(T) and reference strains for the most closely related species showed values below the accepted threshold for species discrimination. The major fatty acids of strain 7209-2(T) were summed feature 8 (C-18:1 omega 7c and/or C-18:1 omega 6c) and summed feature 2 (C-12:(0) aldehyde and/or unknown 10.953) . The major polar lipids were found to consist of phosphatidylethanolamine, diphosphatidylglycerol. phosphatidylglycerol, phosphatidylcholine and an unidentified aminophospholipid. The predominant ubiquinone was identified as quinone 10. Based on all the above results, strain 7209-2(T) represents a novel species of the genus Rhizobium, for which the name Rhizobium rhizophilum sp. nov. is proposed with 7209-2(T) (=CGMCC 1.15691(T)=DSM 103161(T)) as the type strain.

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