Identification and mapping of a rice blast resistance gene Pi-g(t)in the cultivar Guangchangzhan

摘要

A single dominant blast resistance gene was identified in Chinese indica rice(Oryza sativa)cv.Guangchangzhan(GCZ),which shows complete resistance to Japanese isolate Ken53-33 of Magnaporthe grisea.Genetic analysis of the backcross(EC,) and second-generation(F_2)populations from a cross between susceptible cv.Lijiangxintuanheigu(LTH)and GCZ indicated that the resistance was conferred by one dominant gene.This gene was mapped on the long arm of chromosome 2 and flanked by RM166 and RM208 at distances of 4.00(+-)4.90 and 6.30(+-)4.89 cM(centiMorgans),respectively.It was designated tentatively as Pi-g(t).