Genetic Diversity Analysis of Papaya Resources by SRAP and SCoT Combination Cryopreservation of in Vitro Papaya Shoot2tips by Vitrification Technique andIts Regeneration Somatic Embryogenesis and Plant Regeneration from Papaya Suspension Cultures Karyotypes Analysis and 45S rDNA-FISH of the Tetraploid and Diploid in Carica papaya L. Karyotypes Analysis and 45S rDNA-FISH of the Tetraploid and Diploid in Carica papaya L. Studies of Indirect Somatic Embryogenesis of Papaya Studies of Indirect Somatic Embryogenesis of Papaya EFFECT OF ~(60)Co γ IRRADIATION AND GA_3 TREATMENT ON MUTATION OF Carica papaya L. SCoT Fingerprints and Genetic Variations of the Papaya (Carica papaya L.) Major Cultivars Construction of RNAi Two-T-DNA Plant Expression Vector of β-Gal Gene and A Preliminary Study on the Genetic Transformation of Carica Papaya L.