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논문 기본 정보

자료유형
학술저널
저자정보
Cho Ahyeon (Department of Agricultural Chemistry, Jeonbuk National University, Jeonju 54896, Republic of Korea) Joshi Alpana (Department of Bioenvironmental Chemistry, Jeonbuk National University, Jeonju 54896, Republic of KoreaDepartment of Agriculture Technology) Hur Hor-Gil (School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology, Gwangju 61005, Republic of Korea) Lee Ji-Hoon (Department of Agricultural Chemistry, Jeonbuk National University, Jeonju 54896, Republic of KoreaDepartment of Bioenvironmental Chemistry, Jeonbuk National University, Jeonju 54896, Republi)
저널정보
한국미생물생명공학회 Journal of Microbiology and Biotechnology Journal of Microbiology and Biotechnology Vol.34 No.3
발행연도
2024.3
수록면
570 - 579 (10page)
DOI
10.4014/jmb.2310.10025

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초록· 키워드

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Root-nodule nitrogen-fixing bacteria are known for being specific to particular legumes. This study isolated the endophytic root-nodule bacteria from the nodules of legumes and examined them to determine whether they could be used to promote the formation of nodules in other legumes. Fortysix isolates were collected from five leguminous plants and screened for housekeeping (16S rRNA), nitrogen fixation (nifH), and nodulation (nodC) genes. Based on the 16S rRNA gene sequencing and phylogenetic analysis, the bacterial isolates WC15, WC16, WC24, and GM5 were identified as Rhizobium, Sphingomonas, Methylobacterium, and Bradyrhizobium, respectively. The four isolates were found to have the nifH gene, and the study confirmed that one isolate (GM5) had both the nifH and nodC genes. The Salkowski method was used to measure the isolated bacteria for their capacity to produce phytohormone indole acetic acid (IAA). Additional experiments were performed to examine the effect of the isolated bacteria on root morphology and nodulation. Among the four tested isolates, both WC24 and GM5 induced nodulation in Glycine max. The gene expression studies revealed that GM5 had a higher expression of the nifH gene. The existence and expression of the nitrogen-fixing genes implied that the tested strain had the ability to fix the atmospheric nitrogen. These findings demonstrated that a nitrogen-fixing bacterium, Methylobacterium (WC24), isolated from a Trifolium repens, induced the formation of root nodules in non-host leguminous plants (Glycine max). This suggested the potential application of these rhizobia as biofertilizer. Further studies are required to verify the N2-fixing efficiency of the isolates.

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