Microvirga roseola sp. nov. and Microvirga lenta sp. nov., isolated from Taklamakan Desert soil.

Two Gram-negative, rod-shaped, non-spore-forming bacteria, designated SM9 ^T and SM2 ^T , were isolated from Taklamakan Desert soil samples. Phylogenetic analysis based on the 16S rRNA gene sequences showed that strains SM9 ^T and SM2 ^T had the highest sequence similarity to the type strains Microvirga indica BCRC 80972 ^T and Microvirga soli NBRC 112417 ^T with similarity values of 98.2 and 97.7 %, respectively, and Microvirga was among the predominant genera in the desert soil. The draft genomes of these two strains were 4.56 Mbp (SM9 ^T ) and 5.08 Mbp (SM2 ^T ) long with 65.1 mol% (SM9 ^T ) and 63.5 mol% (SM2 ^T ) G+C content. To adapt to the desert environment, these two strains possessed pathways for the synthesis of stress metabolite trehalose. The major fatty acids (>5 %) included C _18 : 1  ω9 c in SM2 ^T , but C _16 : 0 , C _18 : 0 and C _19 : 0 cyclo ω8 c in SM9 ^T , while the major menaquinone was ubiquinone 10 in both strains. The major polar lipids of SM9 ^T and SM2 ^T were phosphatidylglycerol, phosphatidylethanolamine and phospholipid. The average nucleotide identity and digital DNA-DNA hybridization results further indicated that strains SM9 ^T and SM2 ^T were distinguished from phylogenetically related species and represented two novel species within the genus Microvirga , for which the names Microvirga roseola sp. nov. (type strain SM2 ^T =KCTC 72792 ^T =CGMCC 1.17776 ^T ) and Microvirga lenta sp. nov. (type strain SM9 ^T =KCTC 82729 ^T =CCTCC AB 2021131 ^T ) are proposed.