Table 2 Characterization of bacterial isolates from Pteris vittata roots and their resistance to increasing As (V) concentrations.

Isolate	Gene bank accession nr	As (V)						Homology (%)
Isolate	Gene bank accession nr	1 mM	3 mM	6 mM	10 mM	75 mM	100 mM	Homology (%)
PVr_1	MT013507	+ + +	+ +	+ +	+ +	nd	nd	Bacillus halotolerans (99.75%)
PVr_2	MT013508	+ + +	+ + +	+ + +	+ + +	+ + +	+ +	Bacillus simplex (99.34%)
PVr_3	MT013509	+ + +	+ + +	+ + +	+ + +	nd	nd	Bacillus subtilis (98.83%)
PVr_5	MT013510	+ + +	+ + +	+ + +	+ + +	+ + +	+ + +	Paenarthrobacter ureafaciens (98.16%)
PVr_6	MT013511	+ /‐	nd	nd	nd	nd	nd	Bacillus amyloliquefaciens (98.73%)
PVr_7	MT013512	+ + +	+ + +	+ + +	+ +	nd	nd	Bacillus mojavensis (99.48%)
PVr_8	MT013513	+ + +	+ + +	+ + +	+ +	nd	nd	Bacillus mojavensis (98.92%)
PVr_9	MT013514	+ + +	+ + +	+ + +	+ + +	+ + +	+ + +	Beijerinckia fluminensis (100%)
PVr_10	MT013515	+ + +	+ + +	+ + +	+ + +	‐	‐	Bacillus haynesii (99.12%)
PVr_11	MT013516	+ + +	+ + +	(+ + +)	(+ + +)	nd	nd	Lysinibacillus parviboronicapiens (98%)
PVr_12	MT013517	+ /‐	‐	nd	nd	nd	nd	Bacillus nealsonii (98.94%)
PVr_13	MT013518	+ + +	+ + +	+ + +	+ + +	nd	nd	Bacillus subtilis (100%)
PVr_14	MT013519	+ + +	+ + +	+ + +	+ + +	nd	nd	Bacillus subtilis (99.85%)
PVr_15	MT013520	+ + +	+ + +	+ + +	+ + +	+ +	+ +	Acinetobacter schindleri (97.59%)
PVr_16	MT013521	+ + +	+ + +	+ + +	+ + +	+ + +	+ + +	Acinetobacter schindleri (98.07%)
PVr_17	MT013522	+ + +	+ + +	+ +	+ +	+	+	Bacillus halosaccharovorans (100%)

PVr = Pteris vittata root.
Bacterial growth (visual evaluation) after 24 to 48 h in PCA plates at increasing As(V) concentration: ‐absence; + ‐ slight; + moderate; + + medium; + + + high (compared to unpolluted controls) nd = not determined.

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