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Published in Crop Sci 9:498-501 (1969)
© 1969 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Effect of Female Parent, Pollen Development, and Pollen Germinability on Absence of Seed Set in Avena sativafemale x 6x-Amphiploidmale; Pollinations1

R. A. Forsberg, I. Nishiyama and S. Wang2

Plants in A7 – A11 lines of a 6x amphiploid of Avena abyssinica Hochst. x A. strigosa Schreb. were used as pollen parents in two crossing experiments. Females were A. sativa L. cultivars or three unique amphiploid-A. sativa backcross derivatives (D1, D2, D3). D1 had A. sativa cytoplasm while D2 and D3 had amphiploid cytoplasm. All crossing attempts were unsuccessful regardless of the female parent. This result led to an investigation of the development of pollen grains in the amphiploids and their germinability on A. sativa stigmas. The percentages of pollen grains filled with cytoplasm, among 18 panicles from 12 plants, ranged from 69.8 to 97.9. The average was 89.3 compared with 98.7% in A. sativa. The correlation between filled pollen grains and self-fertility in the same panicle was not significant (r = .11). Only 31.0% of the grains had three normal nuclei (Class I) compared with 81.2% in A. sativa. The correlation between percentage of Class I pollen and self-fertility in the same panicle was highly significant (r = .63). Most amphiploid pollen failed to germinate on A. sativa stigmas.

Key Words: Oats • Restoration • Substitution • Pollen grain nuclei • Pollen grain cytoplasm

1 Contribution from the Agronomy Department, University of Wisconsin, Madison 53706. Published with approval of the Director of the Research Division, College of Agricultural and Life Sciences of the University of Wisconsin.

2 Assistant Professor, formerly Visiting Professor, and Research Assistant, respectively, Department of Agronomy, University of Wisconsin, Madison 53706. Financial assistance from the Quaker Oats Company and from the Wisconsin Alumni Research Foundation through the University Research Committee is gratefully acknowledgd by the second author.

Received for publication January 31, 1969.




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