Pyramiding Resistance Gene Pi-ta, Pi-b, and Stv-bi by Marker-assisted Selection in Rice (Oryza sativa L.) Studies on the Chemical Constituents of Bretschneidera sinensis Hemsl. EndEmic in China Effects of Epi-brassinolide (epi-BR) Application at Anthesis on Starch Accumulation and Activities of Key Enzymes in Wheat Grains Molecular Detection of Blast Resistance Genes Pi-b and Pi-5 in Northeast Rice Varieties and Utilization Evaluation of Introduced Resistant Donors