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Published in Crop Sci 9:64-67 (1969)
© 1969 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Breeding Behavior of Two Avena abyssinica x A. strigosa Amphiploids1

R. A. Forsberg and H. L. Shands2

Evaluation of the breeding behavior of two Arena 6x amphiploids constituted the initial phase of a study of their usefulness in facilitating transfer of genes from diploids and tetraploids to hexaploids. Most amphiploid seedling root tip cells in 33 A6 to A9 lines contained from 38 to 44 chromosomes. The most frequent number was 42. Chromosome numbers varied among cells in the same root tip and among tips from sister seedlings. Lines which were uniform and stable for high self-fertility were not found, even after 13 generations. While segregation for reaction to crown rust continued in some A0 lines, others tested in A12 were homogeneous for resistance. A seed set of 20.8% (383 kernels from 1,838 florets) was obtained in amphiploid female x A. sativa L. male pollinations made in the greenhouse. Even though these amphiploids are not agronomically desirable, their relatively high compatibility with A. sativa gives hope for their usefulness.

Key Words: Oats • Plant breeding • Gene transfer • Interspecific hybridization • Chromosome-number mosaics • Sterility • Crown rust resistance • Compatibility • Instability

1 Contribution. from the Agronomy Department, University of Wisconsin, Madison 53706. Published with approval of the Director, Wisconsin Agricultural Experiment Station. Most data front part of a thesis submitted by the senior author in partial fulfillment of requirements for the Ph.D. degree.

2 Assistant Professor and Professor of Agronomy, University of Wisconsin, lVladison 53706.

Received for publication June 12, 1968.




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