Table 1.

The disease index in rice panicles after U. virens artificial inoculation.

	Strains	Panicle incidence rate (%)	Diseased grains/inoculated panicle	P-value∗
1st repeat	P1	100	10.9 ± 1.1
	scre2-9	90	6.7 ± 1.0	0.011462
	scre2-10	60	1.5 ± 0.5	6.38E-08
2nd repeat	P1	90	12.1 ± 1.6
	scre2-9	10	0.2 ± 0.2	3.85E-07
	scre2-10	0	0.0 ± 0.0	3.72E-07
3rd repeat	P1	65	6.0 ± 1.2
	scre2-9	30	1.8 ± 1.0	0.012825
	scre2-10	30	2.0 ± 1.1	0.020498

^∗Statistical significance between the wild-type P1 and mutant strains was determined by Student’s t-test using Microsoft Excel. At least 10 panicles were inoculated for each strain. The diseased panicles and false smut balls formed on the inoculated panicles were counted about 1 month after inoculation. Data are means ± standard errors.