QTL Mapping for Plant Height and Ear Height by Using Multiple Related RIL Populations in Maize Dry Matter Production and Photosynthesis Characteristics of Three Hybrids of Maize (Zea mays L.) with Super-High-Yielding Potential QTL Identification for Plant Height and Ear Height Based on SNP Mapping in Maize (Zea mays L.) SSR Linkage Map Construction and QTL Identification for Plant Height and Ear Height in Maize (Zea mays L.)