Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 8:532-534 (1968)
© 1968 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Tester Performance Level in Topcrosses of Smooth Bromegrass, Bromus inermis Leyss.1

P. W. Voigt2

‘Manchar’ and ‘Sac’ smooth bromegrass, Bromus inermis Leyss., were topcrossed to 96 selected clones. These cultivars were used as male parents because of their different performance levels. Manchar and Sac topcross progenies were evaluated in separate row trials for emergence vigor, spring vigor, forage yield, disease reaction, spread, leafiness, height, lodging, regrowth vigor, and fertility. Correlations between the trials for these characters ranged from .38** to .77** and indicated that in most cases the two testers ranked the clones in much the same way. The low performing tester gave significantly better discrimination for lodging only. The results do not support the hypothesis that in smooth bromegrass testers with a high frequency of desirable genes are necessarily ineffective because of the masking effects of dominance.

Key Words: masking effect of dominance.

1 Contribution from the Agronomy Department, University of Wisconsin, Madison. A portion of a thesis submitted by the author in partial fulfillment of the requirements for the Ph.D. degree at the University of Wisconsin. The author expresses appreciation to Drs. P. N. Drolsom and E. L. Nielsen for their guidance during the study and to Dr. J. H. Torrie for statistical advice.

2 Formerly Research Assistant in Agronomy, now Research Geneticist, Crops Research Division, ARS, USDA, Southern Great Plains Field Station, Woodward, Okla. 73801.

Received for publication October 26, 1967.




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Copyright © 1968 by the Crop Science Society of America.