Source: American Seed Trade Association
Research from the American Seed Trade Association provides corn breeders with guidelines to help determine if a variety is essentially derived.
The concept of an essentially derived variety (EDV) was introduced by the International Union for the Protection of New Varieties of Plants (UPOV) in its 1991 revisions, but didn’t include definitive parameters; thus these revisions have been subject to interpretation.
An EDV is a variety that retains the essential characteristics of and is predominantly derived from an existing parental variety which has a Plant Variety Protection Act certificate. In simple terms, an EDV is a variety that is deemed to be genetically very close to an existing parental variety which is protected.