The clerk of any United States court for the district wherein testimony is to be taken in accordance with regulations established by the Secretary for use in any contested case in the Plant Variety Protection Office shall, upon the application of any party thereof, issue a subpoena for any witness residing or being within such district or within one hundred miles of the stated place in such district, commanding the witness to appear and testify before an officer in such district authorized to take depositions and affidavits, at the time and place stated in the subpoena. The provisions of the Federal Rules of Civil Procedure relating to the attendance of witnesses and the production of documents and things shall apply to contested cases in the Plant Variety Protection Office insofar as consistent with such regulations.