Fig. 4: tRNA gene-copy numbers in bacteria without chromosomal rrn operons.
From: Bacteria can maintain rRNA operons solely on plasmids for hundreds of millions of years
a Comparison with related species for the four independently evolved bacterial clades: Persicobacteraceae (n = 6) and related species (n = 101), T. saccharophirum (n = 1) and related species (n = 43), A. ureilytica (n = 3) and related species (n = 18), and O. saccharovorans (n = 3) and related species (n = 126). Each dot represents a genome. b tRNA gene numbers per isoacceptor family in the Persicobacteraceae (n = 6) and related species (n = 101). tRNAIle (anticodon GAT) genes are exclusively on rrn plasmids, tRNAAla genes are on both rrn plasmids and chromosomes, and the others are exclusively on chromosomes. tRNAIle2 is an AUA codon-specific isoleucine tRNA that has a CAU anticodon. Data are presented as mean values ±standard deviations. c Minimal doubling time estimated using gRodon39. Dataset of genomes is the same as in a. d Numbers of tRNA loci (gene clusters) per cluster size (tRNA gene numbers). a, c P values were calculated using Mann–Whitney U test (one sided). n.s. not significant (p > 0.05). Source data are provided as a Source Data file.
