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Comparative genomics reveals insight into the phylogeny and habitat adaptation of novel species, an endophytic actinomycete associated with scab lesions on potato tubers. | LitMetric

AI Article Synopsis

  • A new type of actinomycete bacteria, strain MEP2-6, was discovered from potato scab tissues in Chiang Mai, Thailand, and exhibits unique characteristics in its cell wall and fat composition.
  • Genetic analysis shows that MEP2-6 is closely related to other known strains, but based on various tests, it's proposed as a new species within its genus.
  • MEP2-6 is not harmful to potatoes and contains genes that could lead to the development of beneficial agricultural and medical products, making it a potential biocontrol agent and source of antibiotics.

Article Abstract

A novel endophytic actinomycete, strain MEP2-6, was isolated from scab tissues of potato tubers collected from Mae Fag Mai Sub-district, San Sai District, Chiang Mai Province, Thailand. Strain MEP2-6 is a gram-positive filamentous bacteria characterized by -diaminopimelic acid in cell wall peptidoglycan and arabinose, galactose, glucose, and ribose in whole-cell hydrolysates. Diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine, and hydroxy-phosphatidylethanolamine were the major phospholipids, of which MK-9(H) was the predominant menaquinone, whereas iso-C and iso-C were the major cellular fatty acids. The genome of the strain was 10,277,369 bp in size with a G + C content of 71.7%. The 16S rRNA gene phylogenetic and core phylogenomic analyses revealed that strain MEP2-6 was closely related to NRRL B-24131 (99.4%), DSM 44654 (99.3%), and GLM-1 (98.9%). Notably, strain MEP2-6 displayed 91.7%, 91.8%, and 87% ANIb and 49%, 48.8%, and 35.4% dDDH to DSM 44653 (=NRRL B-24131), GLM-1, and DSM 44654, respectively. Based on phenotypic, chemotaxonomic, and genomic data, strain MEP2-6 could be officially assigned to a novel species within the genus , for which the name sp. nov. has been proposed. The type of strain is MEP2-6 (=JCM 36309 = TBRC 17632 = NBRC 116395). MEP2-6 was strongly proven to be a non-phytopathogen of potato scab disease because stunting of seedlings and necrotic lesions on potato tuber slices were not observed, and there were no core biosynthetic genes associated with the BGCs of phytotoxin-inducing scab lesions. Furthermore, comparative genomics can provide a better understanding of the genetic mechanisms that enable MEP2-6 to adapt to the plant endosphere. Importantly, the strain smBGCs accommodated 33 smBGCs encoded for several bioactive compounds, which could be beneficially applied in the fields of agriculture and medicine. Consequently, strain MEP2-6 is a promising candidate as a novel biocontrol agent and antibiotic producer.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11004387PMC
http://dx.doi.org/10.3389/fpls.2024.1346574DOI Listing

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