Streptomyces avicenniae sp. nov., a novel actinomycete isolated from the rhizosphere of the mangrove plant Avicennia mariana.

A novel isolate, designated strain MCCC 1A01535(T), belonging to the genus Streptomyces was isolated from the rhizosphere of the mangrove plant Avicennia mariana from Fujian Province, south China. Characterization of the isolate was based on a polyphasic approach. Pairwise comparison of 16S rRNA gene sequences revealed that strain MCCC 1A01535(T) shared 97.7 and 97.5 % sequence similarities to Streptomyces specialis GW41-1564(T) and Streptomyces hainanensis YIM47672(T), respectively, its most closely related neighbours, whereas the DNA-DNA relatedness value between strains MCCC 1A01535(T) and GW41-1564(T) was 50.2 %. The major fatty acids of strain MCCC 1A01535(T) were iso-C(16 : 0), C(16 : 0) and anteiso-C(15 : 0). These differed from the fatty acid compositions of related strains. Strain MCCC 1A01535(T) exhibited an unusual menaquinone system that comprised MK-10(H(6)) as the predominant component and moderate amounts of MK-9(H(6)), MK-9(H(8)) and MK-10(H(8)); minor amounts of MK-9(H(4)), MK-10(H(4)), MK-9(H(10)) and MK-10(H(10)) were also present. Based on its chemotaxonomic, phenotypic and genotypic characteristics, strain MCCC 1A01535(T) is considered to represent a novel species of the genus Streptomyces, for which the name Streptomyces avicenniae sp. nov. is proposed. The type strain is MCCC 1A01535(T) (=DSM 41943(T)=CGMCC 4.5510(T)).