Studies on the Inheritance of "Ch-"Dominant Nucleus Sterility of Millet (Setaria italica) and Its Application to Commercial Production Quantitative Trait Loci for Rice Heading Time in Koshihikari Identification and interaction analysis of QTL for phosphorus use efficiency in wheat QTL Mapping and Interaction Analysis for 1000-Grain Weight and Percentage of Grains with Chalkiness in Rice Inclusive Composite Interval Mapping of Quantitative Trait Genes