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Three Gram-positive, rod-shaped bacteria (strains CC-SBCK-209( T), CC-12309(T) and CC-5209(T)) were isolated from the stalk of the edible mushroom Agaricus blazei grown in the laboratory. 16S rRNA gene sequence analysis indicated that all three isolates clearly belonged to the genus Microbacterium. Strains CC-SBCK-209( T) and CC-12309(T) were most related closely to the type strain of Microbacterium halotolerans (95.9 and 96.1 % 16S rRNA gene sequence similarity, respectively). These two novel strains shared 97.9 % 16S rRNA gene sequence similarity. Levels of similarity to the type strains of all other recognized Microbacterium species were lower than 95.5 %. The third strain (CC-5209( T)) showed the highest 16S rRNA gene sequence similarity to the type strain of Microbacterium resistens (97.6 %); levels of similarity to the type strains of all other recognized Microbacterium species were lower than 96 %. The quinone systems of strains CC-SBCK-209(T), CC-12309(T) and CC-5209(T) consisted of MK-11/MK-12, MK-11/MK-10 and MK-13 as major compounds, respectively. All three strains contained ornithine in their peptidoglycan. The major polar lipids were diphosphatidylglycerol, phosphatidylglycerol and an unknown glycolipid. The polyamine pattern consisted of spermidine and spermine as predominant components. Fatty acid profiles (anteiso-C(15 : 0), iso-C(16 : 0) and anteiso-C(17 : 0 ) as major components) supported the affiliation of all three strains to the genus Microbacterium. The results of physiological and biochemical tests and DNA-DNA hybridization experiments allowed the clear phenotypic and genotypic differentiation of strains CC-SBCK-209(T) and CC-12309( T) from M. halotolerans and other closely related Microbacterium species. Strain CC-5209(T) could be differentiated clearly from M. resistens both genotypically and phenotypically. Based on these data, the novel strains are considered to represent three novel species of the genus Microbacterium. The names proposed for these organisms are Microbacterium agarici sp. nov. [type strain CC-SBCK-209( T) (=DSM 21798(T)=CCM 7686(T))], Microbacterium humi sp. nov. [type strain CC-12309(T) (=DSM 21799(T)=CCM 7687(T))] and Microbacterium pseudoresistens sp. nov. [type strain CC-5209(T) (=DSM 22185(T)=CCM 7688(T))].

international journal of systematic and evolutionary microbiology

Microbacterium agarici sp. nov., Microbacterium humi sp. nov. and Microbacterium pseudoresistens sp. nov., isolated from the base of the mushroom Agaricus blazei