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Updated: May 13, 2026
06:34
Identification of Rare Bacterial Pathogens by 16S rRNA Gene Sequencing and MALDI-TOF MS
Published on: July 11, 2016
Blastococcus endophyticus sp. nov., an actinobacterium isolated from Camptotheca acuminata
Wen-Yong Zhu1,2, Jin-Li Zhang1, Yu-Li Qin1
1Key Laboratory of Microbial Diversity in Southwest China, Ministry of Education and Laboratory for Conservation and Utilization of Bio-Resources, Yunnan Institute of Microbiology, Yunnan University, Kunming, 650091, PR China.
Summary
A new endophytic actinobacterium, Blastococcus endophyticus sp. nov. YIM 68236(T), was discovered in Camptotheca acuminata leaves. This novel species is distinct from other Blastococcus species based on phenotypic and genetic analyses.
Area of Science:
- Microbiology
- Bacteriology
- Plant-associated microbes
Background:
- Endophytic bacteria reside within plant tissues, playing roles in plant health and secondary metabolite production.
- Actinobacteria are a diverse group of Gram-positive bacteria known for their metabolic capabilities and presence in various environments, including as endophytes.
Purpose of the Study:
- To isolate and characterize a novel endophytic actinobacterium from Camptotheca acuminata.
- To determine the taxonomic position of the novel isolate using polyphasic characterization, including phylogenetic and chemotaxonomic analyses.
Main Methods:
- Isolation of endophytic actinobacteria from healthy Camptotheca acuminata leaves.
- Polyphasic taxonomic characterization, including phenotypic analysis (growth conditions, cell morphology), 16S rRNA gene sequencing, DNA G+C content determination, and DNA-DNA hybridization.
- Phylogenetic analysis based on 16S rRNA gene sequences.
Main Results:
- A novel endophytic actinobacterium, strain YIM 68236(T), was isolated and characterized.
- The isolate exhibited optimal growth at 10-45 °C, pH 7.0, and 0-3% NaCl, with a DNA G+C content of 71.6 mol%.
- Phylogenetic analysis placed strain YIM 68236(T) within the genus Blastococcus, but it showed significant phenotypic and genetic divergence from known species, with DNA-DNA relatedness values below 50% to closely related type strains.
Conclusions:
- Strain YIM 68236(T) represents a novel species within the genus Blastococcus.
- The proposed name for this new species is Blastococcus endophyticus sp. nov., with YIM 68236(T) designated as the type strain.
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