Screening and RAPD Analysis of Gummy Stem Blight Resistance in Melon Germplasm Relationship between the resistance to gummy stem blight in the different varieties of melon and the transcript profile of ascorbate peroxidase gene Screening and RAPD Analysis of Gummy Stem Blight Resistance in Melon Germplasm ISSR Markers Linked to Gsb-3 Resistance of Gummy Stem Blight (Didymella bryoniae) in Melon