D-Amino Acid Catabolism Is Common Among Soil-Dwelling Bacteria

摘要

Soil and rhizosphere environments were examined in order to determine the identity and relative abundance of bacteria that catabolize d - and l -amino acids as the sole source of carbon and nitrogen. All substrates were readily catabolized by bacteria from both environments, with most d -amino acids giving similar CFU counts to their l -amino acid counterparts. CFU count ratios between l - and d -amino acids typically ranged between 2 and 1. Isolates were phylogenetically typed in order to determine the identity of d -amino acid catabolizers. Actinobacteria , specifically the Arthrobacter genus, were abundant along with members of the α- and β- Proteobacteria classes.