Marinactinospora endophytica sp. nov., isolated from a medicinal plant

A novel endophytic actinobacterium, designated strain YIM 690053 T , was isolated from healthy stems of Salsola ferganica Drob, and was characterized using a polyphasic taxonomic approach. The strain formed well-branched substrate mycelia with no fragmentation, and abundant aerial mycelia that differentiated into long spores. The strain was found to grow at 10–55 °C, pH 6.0–10.0 and in the presence of 0–7 % (w/v) NaCl. The genomic DNA G+C content was determined to be 70.5 mol%. Phylogenetic analysis based on 16S rRNA gene sequences showed that strain YIM 690053 T belongs to the genus Marinactinospora , and it shared the highest 16S rRNA gene sequence similarity with Marinactinospora thermotolerans SCSIO 00652 T (98.96 %). However, the DNA–DNA relatedness values between the two strains was 37.85 ± 2.77 %. Based on the differences in the molecular and biochemical characteristics from its closest relative, strain YIM 690053 T is concluded to represent a novel species of the genus Marinactinospora , for which the name Marinactinospora endophytica sp. nov. is proposed. The type strain is YIM 690053 T (=KCTC 29664 T = DSM 46799 T ).