“…In this study, nine RGs belonging to different functional classes were selected. RNA polymerase β subunit ( rpoB ), DNA recombination protein ( recA ), gyrase subunit B ( gyrB ), and gyrase subunit A ( gyrA ) have been validated as RGs in previous studies in other plant‐pathogenic bacteria (Jiang et al, 2019; Kałużna et al, 2017; Takle et al, 2007; Yan et al, 2019; Yang et al, 2018). Other genes such as RNA polymerase γ subunit ( rpoC ), RNA polymerase sigma α factor ( rpoA ), rho termination factor ( rho ), ATP synthase subunit δ ( atpD ), and RNA polymerase σ factor RpoD ( rpoD ) were used as RGs in Gluconacetobacter diazotrophicus (Galisa et al, 2012) and Rahnella aquatilis (Li et al, 2019).…”