GROWTH TRAITS ANALYSIS OF REGENERATED PLANTS FROM CALLI OF Lolium perenne L. CARRIED BY SPACESHIP Study on Leaf Phenotypic Variation of a Sympatric Population of Castanea mollissima and C.henryi Regeneration Systems for in Vitro Culture of Filament and Genetic Variation Analyses of Yucca gloriosa L. Variation Analysis of Drought Resistance of Germplasm Resources of Zoysia Willd. in Chinese Main Region Identification and genetic variation analysis of orchardgrass hybrids(Dactylis glomerata)by SSR molecular markers Establishment of A Tetraploid Alfalfa Family and Analysis of Its Genetic Variability Genome Size and Variation Analysis of Mango (Mangifera indica L.) Germplasms in Yunnan by Flow Cytometry Spatial variation analysis of soil organic matter and nutrient factor for before and after planting crops