A New Recessive Gene Conferring Resistance Against Rice Blast

Rice

Table 2 Segregation for resistance in the F₂ population bred from the cross cv. AS20-1 x cv. Aichi Asahi, following inoculation with the M. oryzae isolate EHL0635

Parents/F₂ plants	No. of plants^a					Segregation^b ration	χ ^2c	P
Parents/F₂ plants	R	MR	MS	S	Total	Segregation^b ration	χ ^2c	P
AS20-1	9	19	1	0	29	na
Aichi Asahi	0	0	0	32	32	na
F₂ population	101	282	254	883	1520	1R:3S	0.02	>0.80

^a R resistant, S susceptible, MS moderately susceptible, MR moderately resistant
^b na not applicable
^cChi-square test using the Yates correction comparing resistance [R + MR] with susceptibility [MS + S]