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Published in Crop Sci 6:466-468 (1966)
© 1966 Crop Science Society of America
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A Cytological Study of Certain Autotetraploid Avena Hybrids1

F. J. Muehlbauer and H. G. Marshall2

Autotetraploid hybrids of Avena brevis x A. hirtula, A. hirtula x 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.

1 Joint contribution from the Crops Research Division, ARS, USDA, and the Department of Agronomy, Pennsylvania Agricultural Experiment Station, University Park. This study was part of Northeast Regional Project NE-23 Rev. "Developing Improved Oat Varieties for the Northeastern Region," a cooperative study involving Agricultural Experiment Stations in the Northeast Region and the Cereal Crops Research Branch, CRD, ARS, USDA, and supported in part by regional funds. Part of a thesis submitted by the senior author in partial fulfillment of the requirements for the M.S. degree.

2 Graduate assistant, The Pennsylvania State University; and Research Agronomist, CRD, ARS, USDA, and Assistant Professor of Agronomy.

Received for publication April 16, 1966. Accepted for publication March 3, 1967.






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