Actinoplanes lichenicola sp. nov. and Actinoplanes ovalisporus sp. nov., isolated from lichen in Thailand

Two actinobacteria, designated as strain LDG1-01(T) and LDG1-06(T), were isolated from lichen samples collected in Thailand. Results of morphological characterization, chemotaxonomic studies and 16S rRNA gene analysis indicated that both strains were members of the genus Actinoplanes. MK-9(H-4) was found as the major menaquinone. The major fatty acids were anteiso-C-15:0, iSO-C-15:0, iSO-C-16:0 and anteiso-C-17:0. Phosphatidylglycerol. diphosphatidylglycerol, phosphatidylethanolamine and phosphatidylinositol were observed as the polar lipids, but differences in minor unidentified polar lipids were found between the strains. Results of comparative genome analysis based on average nucleotide identity and digital DNA-DNA hybridization calculations revealed that both strains showed values below 95 and 70%. respectively, from each other and closely related Actinoplanes type strains. Based on data from this polyphasic study, strains LDG1-01(T) and LDG1 -06(T) represent novel species of the genus Actinoplanes. The names proposed are Actinoplanes lichenicola sp. nov. (type strain, LDG1-01(T) (=JCM 33066(T)=TISTR 2982(T)) and Actinoplanes ovalisporus sp. nov. (type strain, LDG1 -06(T)=JCM 33067(T)=TISTR 2983(T)).

Automated summary

Two actinobacteria strains, LDG1-01(T) and LDG1-06(T), isolated from lichen samples in Thailand, were identified as members of the genus Actinoplanes through morphological, chemotaxonomic, and genetic analysis. Comparative genome analysis indicated that these strains represent novel species within the genus Actinoplanes.