Correlation between 1000-grain Weight , Grain Yield and Quality in Japonica Hybrid Rice Study on Variation of 1000-grain Weight and Grain Shape of Two Japonica Soft Rice Lines Induced by Space Flight Pollen and resource limitations to lifetime seed production in a wild population of Ceratoides arborescens Influences of Management Measures on the Seed Set and 1000-grain Weight of Ceratoides arborescens Mining Favorable Alleles of QTLs Conferring 1000-Grain Weight from Synthetic Wheat Relationships Between the Fruit-bearing Characters of Leymus chinensis Population and Annual Climatic Variations in Natural Meadow in Northeast China QTL Mapping and Interaction Analysis for 1000-Grain Weight and Percentage of Grains with Chalkiness in Rice