Cytoplasmic Inheritance of Sweet Potato: with Respect to the Study of Plastids and Mitochondria and the Existence of Their DNA in Sperm Cells Cloning and Sequence Analysis of the Promoter and Signal Peptide-coding Region in Sporamin Gene from Ipomoea batatas Hydrogen Sulfide Promotes Root Organogenesis in Ipomoea batatas, Salix matsudana and Glycine max Genetic Diversity Analysis of Sweet Potato Based on SRAP Markers Genetic Diversity Assessment of Edible Sweetpotato Germplasm Based on ISSR Fingerprint Analysis of nrDNA ITS Sequences in Ipomoea batatas and its Relative Wild Species Study on flavonoids from leaf of Ipomoea batatas Studies on the Chemical Constituents of Ipomoea batatas Lam. Establishment and Validation of the Model of Ipomoea batatas Leaf Traits rDNA FISH Analysis and DAPI karyotype of Ipomoea batatas cv.and Ipomoea hederacea Jacq. Cloning of lyc-b Gene from Sweetpotato (Ipomoea batatas L.) and Transferring the Gene into Tobacco Studies on Embryogenesis and Plant Regeneration of Sweet Potato (Simon.1)(Ipomoea batatas) in Tissue Culture Determination of caffeic acid in leaves of Ipomoea batatas (Simon Ⅰ) by HPLC