Germplasm collection, hybridization and selection of improved sweet potato varieties [study conducted in the Philippines]

asia asie breeding breeding methods convolvulaceae crops cultivos dicotiledoneas dicotyledons economic plants filipinas germoplasma germplasm hortalizas (plantas) hybridation hybridizing industrial crops ipomoea ipomoea batatas methode methods philippines plantas plantas azucareras plantas feculentas plantas industriales plante plante de culture plante industrielle plante racine plants plasma germinatif root crops root vegetables selection starch crops sugar crops tubiflorae vegetable crops