Evaluation on the Rice Blast Resistance of Three Space-Induced Rice Mutant Lines and Analysis of the Resistant Heredity

The rice blast resistance (R) could be evaluated entirely by investigating the resistance spectrum at seedling stage and neck blast resistance at adult stage. In this study, three space-induced rice mutant lines, which had been screened primarily, were performed with resistance spectra with 36 blast isolates from Guangdong Province and neck blast resistance in a natural blast nursery, Lütian, Conghua. The results indicated that the mutant lines conferred broad resistance spectra and high level of resistance to neck blast, while the on-ground control was highly susceptible. Genetic analysis showed that a single major dominant R gene conditioned H4’s and H11’s resistance to isolates GD0193 and GD866, and there were two independent dominant R genes in H4 and H11 corresponding to isoaltes GD08T4 and GD08T13, respectively. The inherited pattern of resistance in D69 to isolates GD0193 was complicated, while a single dominant major R gene controlled its resistance to isolate GD08T4 and GD866.