Objective The distribution of 6 resistance genes in 40 cultivated rice varieties in Zhejiang (CRZ) and 6 physiological race identification (PRI) cultivars of Magnaporthe grisea as well as the blast resistance of the rice seedlings were studied.
Method The distribution of 6 resistance genes, i.e., Pi1, Pi9/Piz, Pi2/Pizt, Pikh, Pikm and Pita, in the rice varieties was obtained using functional markers. The resistance to M. grisea of all 46 rice varieties was determined based on the 141 strains collected in the field from 2015 to 2017.
Result Among the resistance genes, Pita had the highest distribution frequency at 47.83% followed by Pikh at 41.30%; Pi2/Pizt and Pikm, same at 34.78%; Pi9/Piz, low at 21.74%; and Pi1 found only in TTP, one of PRI cultivars. In all, there were 22 rice varieties that showed a resistance rate beyond 60%, and 2 varieties more than 80%.
Conclusion The resistance genes carried by the 40 CRZ and the 6 PRI cultivars partially correlated with the resistance level exhibited by the cultivars.
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