Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 6:441-443 (1966)
© 1966 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Genetics and Agronomic Significance of Spike color in ‘Fairway’ Crested Wheatgrass, Agropyron cristatum (L.) Gaertn.1

R. P. Knowles and George Fedak2

Test crosses in ‘Fairway’ crested wheatgrass (2n = 14) indicated spike color to be controlled by a single gene Yy, with gray spikes being yy and green-spiked plants YY or Yy. Phenotypic frequencies were 72% bright green, 8% gray, and 20% intermediate gray-green. Intermediate gray-green plants were usually heterozygous, but occasionally homozygous YY. No yield differences could be detected between green and gray-spiked forms, but the gray form was slightly lower in fibre content.

1 Contribution No. 246, Canada Agriculture Research Station, Saskatoon, Saskatchewan, representing part of a thesis submitted by the junior author to the University of Saskatchewan for the degree of Master of Science, 1965.

2 Grass Breeder, Canada Agriculture Research Station, Saskatoon, Saskatchewan, and Graduate Student, Montana State University, Bozeman, Montana.

Received for publication March 3, 1966.




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