Effects of Exogenous GA3 Treatment on Photosynthetic Characteristics of Soybean Dwarf Mutant Detection of Quantitative Trait Loci for Plant Height in Different Photoperiod Environments Using an Immortalized F2 Population in Maize Detection of Quantitative Trait Loci for Plant Height Using an Immortalized F2 Population in Wheat The Influences of Shooting Duration and Climatic Factors on Plant Height Growth Analysis of Plant Height Heterosis Based on QTL Mapping in Wheat Nitrogen Uptake and Utilization of Summer Maize Hybrids with Different Plant Heights