Table 2.

Δatg1 pathogenicity at 10 days after inoculation (dai).

Treatment*	Dikaryon	Replicates	Plants per replicate	Disease index†	t‐grouping‡
1	+/+	3	20	2.56 ± 0.23	A
2	+/−	3	20	2.55 ± 0.15	A
3	−/+	3	20	2.25 ± 0.10	AB
4	−/−	3	20	1.9 ± 0.20	B

^* Treatment: paired strains are as follows (see Table 4 for strain genotypes): 1, (1/2 × 2/9); 2, (1/2 × MN29.4); 3, (MN12.4 × 2/9); 4, (MN12.4 × MN29.4). Inoculation was at 10⁶ cells/mL for all strains.

^† Mean ± standard errors were calculated for each treatment on the basis of independent biological replicates.

^‡ Statistical analysis was performed using a nonparametric test of ordinal data in designed factorial experiments (Shah and Madden, 2004).