TABLE 3.

Cross-year B. napus core bacterial taxa identified in at least 75% of the samples at Saskatoon site.

Taxonomy						Core in
Phylum	Class	Order	Family	Genus	Species	2016	2017
Acidobacteria	Chloracidobacteria	RB41	Ellin6075	Unclassified		Y
Actinobacteria	Actinobacteria	Actinomycetales	Micrococcaceae	Arthrobacter		Y	Y
			Propionibacteriaceae	Microlunatus			Y
	Thermoleophilia	Gaiellales	Gaiellaceae	Unclassified		Y
Bacteroidetes	Sphingobacteriia	Sphingobacteriales	Sphingobacteriaceae	Pedobacter			Y
				Unclassified			Y
Proteobacteria	Gammaproteobacteria	Enterobacteriales	Enterobacteriaceae	Erwinia			Y (2)∗
		Pseudomonadales	Pseudomonadaceae	Pseudomonas			Y
	Alphaproteobacteria	Rhizobiales	Bradyrhizobiaceae	Bradyrhizobium		Y	Y
		Rhodospirillales	Rhodospirillaceae	Skermanella		Y
		Sphingomonadales	Sphingomonadaceae	Kaistobacter			Y
	Gammaproteobacteria	Xanthomonadales	Xanthomonadaceae	Stenotrophomonas	retroflexus	Y	Y
				Stenotrophomonas	maltophilia		Y

Weekly sampling for 10 weeks in 2016 and at three growth stages in 2017. “2016” and “2017” represent the study years. The number in bracket indicates the number of amplicon sequence variants for that genus. Please see Supplementary Table S5 for full table showing their corresponding prevalence and relative abundance. ^∗There were two amplicon sequence variants for that genus.