A Novel Rhizobium sp. Chiba-1 Strain Exhibits a Host Range for Nodule Symbiosis in Lotus Species.

IF 2.1 4区 环境科学与生态学 Q3 BIOTECHNOLOGY & APPLIED MICROBIOLOGY Microbes and Environments Pub Date : 2023-01-01 DOI:10.1264/jsme2.ME23056
Yuhei Chiba, Mao Sasaki, Sachiko Masuda, Arisa Shibata, Ken Shirasu, Yasuyuki Kawaharada
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Abstract

Rhizobia are soil bacteria that induce the formation of nodules in the roots of leguminous plants for mutualistic establishment. Although the symbiotic mechanism between Lotus japonicus and its major symbiotic rhizobia, Mesorhizobium loti, has been extensively characterized, our understanding of symbiotic mechanisms, such as host specificity and host ranges, remains limited. In the present study, we isolated a novel Rhizobium strain capable of forming nodules on L. burttii from agricultural soil at Iwate prefecture in Japan. We conducted genomic and host range ana-lyses of various Lotus species. The results obtained revealed that the novel isolated Rhizobium sp. Chiba-1 was closely related to R. leguminosarum and had a wide host range that induced nodule development, including L. burttii and several L. japonicus wild-type accessions. However, L. japonicus Gifu exhibited an incompatible nodule phenotype. We also identified the formation of an epidermal infection threads that was dependent on the Lotus species and independent of nodule organ development. In conclusion, this newly isolated Rhizobium strain displays a distinct nodulation phenotype from Lotus species, and the results obtained herein provide novel insights into the functional mechanisms underlying host specificity and host ranges.

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一株新根瘤菌赤叶-1在莲藕中显示出根瘤共生的宿主范围。
根瘤菌是一种土壤细菌,它能诱导豆科植物根部形成根瘤,实现共生。虽然日本莲与其主要的共生根瘤菌——loti中根瘤菌之间的共生机制已经被广泛表征,但我们对共生机制的理解,如宿主特异性和宿主范围,仍然有限。在本研究中,我们从日本岩手县的农业土壤中分离出一种新的根瘤菌,能够在布氏乳杆菌上形成根瘤。我们对不同种类的荷花进行了基因组分析和寄主范围分析。结果表明,新分离到的赤叶根瘤菌1号与豆科根瘤菌亲缘关系较近,寄主范围广,可诱导根瘤发育,包括布氏根瘤菌(L. burtii)和几种日本根瘤菌野生型。而枇杷则表现出不相容的根瘤表型。我们还发现了表皮感染线的形成,这是依赖于莲种和独立于结节器官的发育。总之,这个新分离的根瘤菌菌株显示出与莲花物种不同的结瘤表型,本文的结果为宿主特异性和宿主范围的功能机制提供了新的见解。
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来源期刊
Microbes and Environments
Microbes and Environments 生物-生物工程与应用微生物
CiteScore
4.10
自引率
13.60%
发文量
66
审稿时长
3 months
期刊介绍: Microbial ecology in natural and engineered environments; Microbial degradation of xenobiotic compounds; Microbial processes in biogeochemical cycles; Microbial interactions and signaling with animals and plants; Interactions among microorganisms; Microorganisms related to public health; Phylogenetic and functional diversity of microbial communities; Genomics, metagenomics, and bioinformatics for microbiology; Application of microorganisms to agriculture, fishery, and industry; Molecular biology and biochemistry related to environmental microbiology; Methodology in general and environmental microbiology; Interdisciplinary research areas for microbial ecology (e.g., Astrobiology, and Origins of Life); Taxonomic description of novel microorganisms with ecological perspective; Physiology and metabolisms of microorganisms; Evolution of genes and microorganisms; Genome report of microorganisms with ecological perspective.
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