[Embryology of ovules from the second-year-old cones of scotch pine after acute irradiation in the zone of Chernobyl nuclear plant].

The embryological processes after acute irradiation in the zone of Chernobyl (radiation level 4-5 Yy) were studied in ovules from the second-year-old cones of scotch pine. Four types of anomalies were detected in ovules of all experimental pine trees: undeveloped ovules in layer of strobiles; a substitution of female gametophit by tissues originaled from tapetal or nucellar cells; death of macrogametophytes connected with the interruption of divisions during the cenocitic stage in full-fertile pine trees. These anomalies appear during the normal development of microgametophytes.