Preliminary Studies on Polyploidy Mutation of Cut Flower Gerbera jamesonii Bolus Preliminary Studies on Polyploidy Mutation of Cut Flower Gerbera jamesonii Bolus Karyotype Analysis of Rosa laxa,Modern Rose and Their Interspecific Hybrids A Method for Direct Determination of Ploidy Level of Somatic Cells in Different Layers of Cytochimeral Tissue of Pelargonium zonale Somatic Embryogenesis and Analysis of the Genetic Stability of RegenerationSystem in Grapevine ‘Sinsaut’ Somatic Embryogenesis and Analysis of the Genetic Stability of RegenerationSystem in Grapevine ‘Sinsaut’ Morphological characteristics of leaf epidermis and size variation of leaf, flower and fruit in different ploidy levels in Buddleja macrostachya (Buddlejaceae) Comparison of agronomical traits between the wild diploid and its autotetraploid in the Dactylis glomerata subsp. Himalayensis