Article

The isoenzyme structure of the Festuca nigrescens populations of the Boatin National Reserve was examined for esterase (11 isoforrns), peroxidase (8 isoforms), and acid phosphatase (lO isoforrns), and the results compared with average values from 6 other Bulgarian populations, previously studied. In spite of its vicinity to a copper refinery, the Boatin population has an isoenzyme structure that is stp.ble over time and does not differ significantly from the B ulgarian average.