Cloning, analysis, and expression of limonoid UDP-glucosyl transferase gene in Citri Reticulatae Semen CYTOLOGICAL IDENTIFICATIONS ON STUDIES ON THE MORPHOLOGICAL AND CYTOLOGICAL CHARACTERISTICS OF PONKAN (CITRUS RETICULATA BLANCO)MIXOPLOID A New Ponkan Cultivar‘Heping Ponkan‘ Status quo of Ponkan ( Citrus reticulata Blanco) Fruit Quality and QualityComparison between Several Production Areas in China A New Ponkan Cultivar‘Heping Ponkan‘ Obtaining of Ponkan (Citrus reticulata Blanco ) Tetraploid by Culturing Embryos of Mature Seeds A New Ponkan Cultivar‘Huagan 2’ A New Ponkan Cultivar‘Huagan 2’ Obtaining of Ponkan (Citrus reticulata Blanco ) Tetraploid by Culturing Embryos of Mature Seeds