Development of Potato High Efficiency Marker-free Transgenic Technology Constructed the Cre/loxp Recombination Inducible Excision System and Obtained Marker-free Transgenic Apple Plants Inverted-Repeat Transgenic Maize Plants Resistant to Sugarcane Mosaic Virus DEVELOPMENT OF MARKER-FREE TRANSGENIC POTATO WITH AtMYB12 GENE BY Cre/lox SITE-SPECIFIC RECOMBINATION SYSTEM Generating Marker-free Transgenic Chrysanthemum by Agrobacterium Mediated Transformation with Twin T-DNA Binary Vectors Acquirement of marker-free transgenic tobacco plants carrying two pathogen-indu-cible promoters LRP Transgenic Indica Rice Restorer Line without Resistance Selection Marker A New Cre/lox System for Deletion of Selectable Marker Gene The Construction of a Binary Vector for Marker-free Transformation in Plants Generating Marker-free Transgenic Chrysanthemum by Agrobacterium Mediated Transformation with Twin T-DNA Binary Vectors The Construction of a Binary Vector for Marker-free Transformation in Plants Breeding and Field Performance of Novel Soft and Waxy Transgenic Rice Lines without Selectable Markers Cre/lox-mediated Marker Gene Excision in Elite Indica Rice Plants Transformed with Genes Conferring Resistance to Lepidopteran Insects Constructed the Cre/loxp Recombination Inducible Excision System and Obtained Marker-free Transgenic Apple Plants Characterization of Marker-free Transgenic Soybeans with △6-fatty Acid Desaturase Gene Expressing γ-linolenic Acid