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Published in Crop Sci 8:423-426 (1968)
© 1968 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Inheritance of Tolerance in Flax (Linum usitatissimim L.) Treated with MCPS1

R. E. Stafford, V. E. Comstock and J. H. Ford2

Progeny arising from crosses between 2-methyl-4-chlorophenoxyacetic acid (MCPA)-tolerant and MCPA-susceptible flax varieties were evaluated for MCPA tolerance in F3, F4, BC(S2), and BC(S3) generations. Data were obtained on the change in anthocyanin production and stem curvature, delays to first bloom, full bloom, and maturity, and on the reduction of plant height andseed yield.

Based on heritability estimates, selection would be most effective for change in anthocyanin production, stem curvature, and reduction in plant height in the ‘Arrow’ x ‘Dakota’ cross and most effective for stem curvature, and delays to first bloom and to maturity in the Arrow x C.I. 1139 cross.

Key Words: herbicide tolerance • genetic variance • regression

1 Cooperative investigations of the Minnesota Agricultural Experiment Station and the Crops Research Division, Agricultural Research Service, U.S. Department of Agriculture. Paper No. 6416, Scientific Journal Series, Minnesota Agricultural Experiment Station. Research supported in part by a grant from the Flax Development Committee of the U.S. Flax Institute.

2 Formerly Graduate Research Assistant, (now Plant Breeder with American Crystal Sugar Co., Rocky Ford, Colo.); and Research Agronomists, Crops Research Division, ARS, USDA, University of Minnesota, St. Paul, Minn. 55101.

Received for publication January 24, 1968.




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