Enhancement of heavy metal phytoremediation by Alnus firma with endophytic Bacillus thuringiensis GDB-1

► This is a first report of Alnus firma as Pb hyperaccumulator. ► Alnus firma is a suitable for metal phytostabilization and Pb hyperaccumulation. ► Bacillus tubingenisis is an efficient PGP entophytic bacterium. ► B. tubingenisis showed good heavy metal removal efficiency from mine tailing. ► B. tubingenisis enhanced the growth and heavy metal accumulation of A. firma.