Meiothermus

Abstract

Mei.o.ther'mus. Gr. prefix meio ‐ less; Gr. adj. thermos hot; N.L. masc. n. Meiothermus to indicate an organism in a less hot place. “Deinococcus‐Thermus” / Deinococci / Thermales / Thermaceae / Meiothermus Straight rods, 0.4–1.0 µm in width; the cell length is variable. Long filaments are formed. Nonmotile; do not possess flagella. Endospores are not observed. Stain Gram‐negative. Red‐ or yellow‐pigmented colonies are produced. Slightly thermophilic, with optimum growth temperatures of 45–60°C; none of the strains have been observed to grow above 70°C. The optimum pH ranges from 7.0 to 8.5. Growth is chemoorganotrophic, aerobic with a strictly respiratory type of metabolism, but some species grow with nitrate as the terminal electron acceptor. Oxidase positive and catalase variable. Strains generally require yeast extract or cofactors for growth. Sugars, amino acids, organic acids, and polyols are used as sole carbon and energy sources. Ornithine is present in the peptidoglycan. Menaquinone 8 (MK‐8) is the predominant respiratory quinone. One major phospholipid and two prominent glycolipids migrating close to each other dominate the polar lipid pattern; some strains possess only one major glycolipid. Additional phospholipids and glycolipids are minor components. Phospholipids and glycolipids are primarily glycerol based, but some strains also possess 1,2‐diol‐based lipids. Fatty acids are predominantly iso‐ and anteiso‐branched. Branched‐ and straight‐chain 2‐hydroxy and/or 3‐hydroxy fatty acids are present in most strains. Found in hydrothermal areas with neutral to alkaline pH; also isolated from fermenters and paper‐machine biofilms. DNA G + C content (mol%) : 60.9–69.9. Type species : Meiothermus ruber . Nobre, Trüper and da Costa 1996a, 605 VP ( Thermus ruber Loginova, Egorova, Golovacheva and Seregina 1984, 498).

Influence of root cortical aerenchyma on the rhizosphere microbiome of field-grown maize

“…Among the OTUs with the highest abundance at high-RCA in high nitrogen at RS (USA), we found the genus Oceanobacillus (Phylum Firmicutes), previously reported in rhizosphere of halophyte plant species as betaine and proline producer and phosphate solubilizer (Mukhtar et al 2018; El-Tarabily and Youssef, 2010). The most abundant OTUs enriched at low-RCA belonged to the familie Diplorickettsiaceae of the phyllym Proteobacteria (Genus Aquicella ), a pathogen to protozoans (Albuquerque et al, 2018), and Chitinophagaceae of the phylum Bacteroidetes (genus Chitinophaga ) common inhabitant of maize rhizospheres (Walters et al, 2018).…”