Analysis of Population Genetic Structure of Maize by SSR Marker and Heterotic Grouping Analysis on Heterotic Groups of 17 Inbred Lines Derived Maize Landraces Combining Ability and Heterosis of 14 CIMMYT and 13 Domestic Maize Populations in an NCⅡ Mating Design Analysis on Heterotic Groups and Heterotic Patterns of High Oil Corn Inbred Lines Cluster Analysis of Local Maize(Zea mays L.) Germplasm in Sichuan Based on SSRs Genetic Diversity of Elite Maize Germplasm for Resistant to SCMV Heterotic Grouping of Maize Inbred Lines Using RFLP and SSR Markers Application of AFLP Markers to Heterotic Grouping of Elite Maize Inbred RFLP Detection of Genetic Variation of Maize Inbred Lines