ISSR Analysis of Hybrids of Loose Spike Sorghum and Sudangrass Screening of Embryogenic Callus from Hybrid F1 of Caucasian Clover×White Clover AFLP Analysis on Interspecific Hybrid F1 and the Parents between Elymus canadensis L.and E.dahuricus Turcz.or E.cylindricus(Franch.) Honda Isozyme Analysis of Chromosome-Doubling Plant of Triploid Hybrid of Elymus Canadensis and Hordeum Brevisubulatum Intergeneric Hybridization and its Cytological Analysis of Elymus dahuricus and Hordeum brevisubulatum Analysis of Esterase Isozymes of Elymus dahuricus,Hordeum brevisubulatum Their Hybrid F1 and BC1 Studies on Cytogenetics of Elymus Dahuricus,Hordeum Brevisubulatum and Their Hybrid F1 and BC1 Acquisition and Utilization Characteristics of Phosphorus in Hybrid F1 and Parents with Different P Efficiencies under Phosphorus Deficient Condition