Halalkalirubrum

Abstract

Hal.al.ka.li.ru'brum. Gr. masc. n. hals , halos , salt; N.L. neut. n. alkali , alkali; L. neut. adj. rubrum , red; N.L. neut. n. Halalkalirubrum , red organism existing in salted and alkaline environment. Euryarchaeota / Halobacteria / Haloferacales / Halorubraceae / Halalkalirubrum The genus Halalkalirubrum consists of haloalkaliphilic archaea. Cells are pleomorphic, Gram‐stain‐negative, and approximately 0.5 μm in diameter. Cells lyse when the NaCl concentration is below 2%. Oxidase and catalase tests are positive. They can grow with 11–25% (w/v) NaCl, at pH 7.0–10.5, and between 4 and 42°C at Mg 2+ concentrations between 0 and 0.1 M. Colonies are circular, smooth, and red pigmented. H 2 S is not produced from thiosulfate. Indole formation is negative. Reduction of nitrate to nitrite is negative. Nitrite is not reduced under aerobic conditions. Anaerobic growth with nitrate, arginine, and DMSO is not observed. Cells do not hydrolyze gelatin, casein, starch, and Tweens 20, 40, 60, and 80. The following carbon sources are utilized as single carbon or energy sources for growth: glucose, maltose, lactose, sorbitol, acetate, pyruvate, lactate, fumarate, succinate, alanine, glutamate, ornithine, fructose, sorbose, xylose, mannitol, citrate, glycine, arginine, aspartate, and lysine. The major polar lipids are PG, PGP‐Me, PGS, and one unidentified glycolipid. DNA G + C content of the type strain of the type species is 58.37 mol%, a little lower than most of the closely related genera within the order Haloferacales . Known habitats are saline environments. DNA G + C content (mol%) : 58.37. Type species: Halalkalirubrum salinum Zuo et al. 2021, VL207.