Identification and Evaluation on Blast Resistance of Rice Varieties in Jiangsu

Twenty-eight monogenic lines and 740 varieties of rice were examined for their resistances to blast in the fields in Lianyungang,Jiangsu.Among the 28 monogenic samples,Fujisaka 5(Pii),Taride 1(Pizt),F-80-1(Pik),F-124-1(Pita),F-98-1(Pikm),F-128-1(Pita2),C101 LACC Pi1(t),C101A51 Pi2(t)and C104 PKT Pi3(t)exhibited high resistances to blast.Nighty-seven of the 740 cultivars were found to be highly resistant,230 resistant,200 moderate resistant,93 moderately susceptible,48 susceptible,and 55 highly susceptible to the blast.To evaluate the genetic effect of these resistant genes,195 samples with high resistance or susceptibility to the blast were selected.The important cultivars were analyzed on their molecular markers with 10 functional ones for the resistant genes.The result showed that the locus of Piiwas found in 28 of the materials,Pikhin 40,Pitain 52,Pibin 110,Pi2 in 11,and Pikin 2.On the other hand,no locus of Pi1,Pikm,Pikp or Pi9 was detected in these varieties.