Effects of disease control and growth promotion of Polygonum viviparum endophytic bacteria Bacillus mojavensis on potato Cloning of potato polyphenol oxidase gene and constructing of antisense PPO expression vector Optimization of Refluxing Extraction Technology of Anthocyanins from Purple Sweet Potato by Response Surface Method Effects of three fertilizers on uptake, transformation, yield and quality of potatoes Relationships of Starch Concentration with Specific Leaf Weight and Mineral Concentrations in Potato Leaves Under Varied CO2 and Temperature