Effects of Chemical Regulation on Grain Relative Plumpness and Its Relationship with Yield and Grain Quality of Large Panicle Japonica Rice Vascular Anatomical Traits of Caryopsis in Different Positions and Its Relationship with Quality Traits of Japonica Rice Difference of Bleeding Intensity in Different Parts of Rice Plant and Its Relationship with Grain Plumpness Relationship between Concentrations of Polyamines in Filling Grains and Rice Quality Mapping of QTLs Controlling Grain Plumpness of Rice Using Doubled Haploid Lines Genetic Analysis of Grain Plumpness of Rice Using a DH Population Derived from an Indica/Japonica Cross STUDY ON THE DISTRIBUTION OF PHOTOSYNTHETIC PRODUCTS AND PLUMPNESS OF TWO LINE INTERSUBSPECIFIC HYBRID RICE STUDY ON THE ROOT ACTIVITY, PHOSPHORUS DISTRIBUTION AND GRAIN PLUMPNESS OF TWO LINE INTERSUBSPECIFIC HYBRID RICE