In case the whole or a part interest in a variety is assigned, the application shall be made by the owner or one of the persons identified in Sec. 97.13. However, the certificate may be issued to the assignee, or jointly to the owner and the assignee, when a part interest in a variety is assigned. [58 FR 42435, Aug. 9, 1993, as amended at 60 FR 17189, Apr. 4, 1995]