APPLICATION OF QUADRATIC REGRESSIVE ORTHOGONAL DESIGN TO OPTIMIZE REGENETATION SYSTEM OF Dianthus caryophyllus L. Cloning and Prokaryotic Expression of Carnation DcPAL1 Gene Construction of Repeated Carnation ACC Oxidase Gene PlantRecombinant Expression Vectors CLONING OF ACC OXIDASE GENE OF CARNATION AND CONSTRUCTION OF ITS PLANT ANTISENSE EXPRESSION VECTORS RAPD Identification of Different Carnation Cultivars Effect of Preservatives on the Morphology and Anatomy of Carnation Cut Flowers