TABLE 1.

Quantitative assessment of tolerance among Fusarium species

Speciesa	Strainb	Radial growth (mm) on BOAd	Tolerance (%) to BOAf	Metabolism of BOAg
F. verticillioides	JFL A00999	8.1 ± 0.9	25	+
	JFL A04516	15 ± 1.4	43	+
	MRC 826	21 ± 1.7	64	+
	NRRL 25059	0	0	−
	RRC 408	19 ± 0.9	53	+
F. beomiforme	NRRL 13606	0.3 ± 0.3	0.8	+
	NRRL 25185	0.3 ± 0.4	0.9	−
F. brevicatenulatum	NRRL 25446	1.5 ± 1.1	5.0	+
	NRRL 25447	2.1 ± 1.5	7.0	+
F. cerealis	RRC 449	15 ± 4.5	39	+
	RRC 450	12 ± 3.5	34	+
F. circinatum	NRRL 25333	2.2 ± 0.9	7.0	+
	NRRL 26431	0.2 ± 0.4	0.7	+
F. graminearum	NRRL 5885	0.1 ± 0.3	0.3	+
	NRRL 26916	9.3 ± 1.8	27	+
F. oxysporum	NRRL 13307	0.6 ± 0.6	2.1	+
	NRRL 22539	0	0	−
	NRRL 22544	0	0	−
F. proliferatum	JFL D00666	0e	0	+
	JFL D02877	0e	0	+
	JFL D02937	0e	0	+
F. pseudoanthophilum	NRRL 25206	0.3 ± 0.6	1.3	+
	NRRL 25209	0	0	−
	NRRL 25211	0.6 ± 1.2	2.2	+
F. subglutinans	JFL E01583	12 ± 0.4	41	+
	JFL E03809	10 ± 0.9	39	+
Fusarium sp.	NRRL 25221c	1.0 ± 1.0	3.2	+

^aAll taxa except F. beomiforme, F. graminearum, and F. oxysporum are members of the G. fujikuroi complex. 

^bSee Materials and Methods for more information on the strains. 

^cDespite its unresolved taxonomy, this strain is phylogenetically distinct from the other taxa (41) and is included here because of its tolerance to BOA and association with maize. 

^dMean radial growth (± standard deviation) of strains at 7 days postinoculation on PDA amended with 1.0 mg of BOA per ml. Results are based on two experiments with three replicates each. 

^eThis strain is considered weakly tolerant because after 14 days incubation it produced measurable growth and metabolized BOA to HPMA. This was not observed for truly sensitive strains. 

^fValues represent radial growth on BOA-amended PDA as a percentage of growth on control plates. 

^g+, ability to metabolize BOA; −, lack of metabolism. Transformation of BOA was assessed by TLC of agar plug samples as described in Materials and Methods.