Abstract
Autotetraploid hybrids of Avena brevis ✕ A. hirtula, A. hirtula ✕ A. strigosa, and reciprocal were studied for cytological behavior, self‐fertility, and cross‐fertility in the C1 and C2 generations. There was no statistical difference between hybrids or generations for these characters. Cells with 10 bivalents and 2 quadrivalents were the most common type of chromosome pairing at metaphase I of meiosis. The overall means were .52 univalents, 9.86 bivalents, .33 trivalents, and 1.69 quadrivalents. Complete bivalent pairing was occasionally observed. When compared to data for autotetraploids of A. strigosa, the hybrids showed an increase of 4 to 5 bivalents, a decrease in multivalents, and about 20% higher self‐fertility.It was suggested that the increased meiotic stability of the autotetraploid hybrids was caused either by genic control of chromosome pairing or by cryptic structural differences between homologues from the As genomes of the parental species.
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