In the interspecific hybrids, multivalents and univalents were seen at metaphase I of PMC meiosis in addition to bivalents. The number of univalents/cell was 1.6-2.27. The number of bivalents was 5.55-6.65 (vs. 7.36-8 in A. fistulosum). A correlation was found between fertility and the frequency of anomalies at meiosis. The hybrids inherited resistance to Phoma terrestris as a dominant trait.