The analyses on the characters of wheat cultivars with durable resistance to wheat strip rust (Puccinia striiformis West.) in China Evaluation of the resistance spectrum of three important rice cultivars against blast disease caused by Magnaporthe oryzae and correlation analysis among evaluation indexes Improving Blast Resistance of Jinggeng1 Using Molecular Marker Technique Resistance Spectrum Difference between Two Broad-spectrum Blast Resistance Genes, Pigm and Pi2, and Their Interaction Effect on Pi1