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Published in Crop Sci 29:80-82 (1989)
© 1989 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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The Loci Fr1 and Ep Define Soybean Linkage Group 12

J. D. Griffin*, S. L. Broich, X. Delannay and R. G. Palmer

Biochemistry Dep., 117 Schweitzer Hall, Univ. of Missouri-Columbia, Columbia MO 65211
Dep. of Crop Science, Oregon State Univ., Corvallis, OR 97330
Monsanto Agricultural Co., St. Louis, MO 63198
USDA ARS, Dep. of Agronomy and Genetics, Iowa State Univ., Ames, IA 50011

* Corresponding author.

A study was conducted to verify linkage between the loci Fr1 (root fluorescence) and Ep (seed coat peroxidase activity level) in the soybean, Glycine max (L.) Merr., as well as to test for linkage between the two loci and various other markers. Crosses were made between a standard cultivar (Minsoy) and a diverse selection of lines; the crosses included reciprocals and both linkage phases. The F1 plants were grown in five different location/year combinations. Segregation data for F2 confirm that Fr1 and Ep are linked. The combined estimate of linkage, based on 6734 F2 individuals, indicates that Fr1 and Ep are separated by a distance of 41.4 ± 0.8 cM. Genes Fr1 and Ep were tested for linkage with several cytological and genetic markers in segregating F2 populations. Linkage Group 12 is not physically linked to the trisomic chromosomes A, B, C, or D or to those chromosomes involved in a chromosome interchange from G. soja (Sieb. et Zucc.) PI 101404B. Linkage Group 12 also is independent of the loci Aco4, Dia1, Idh1, Pb, Sod1, Sp1, T, W1, Y9, and probably Ap.

Joint contribution of North Central Region, USDA-ARS and Journal Paper no. J-1298 5 of the Iowa Agric. and Home Economics Exp. Stn., Ames, IA 50011; Projects 2763 and 2781.

Received for publication April 7, 1988.




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