Agronomy Journal Journal of Natural Resources and Life Sciences Education
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Published online 1 October 1956
Published in Agron J 48:435-439 (1956)
© 1956 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Inheritance of the Mode of Reaction to Stem Rust, Particularly Race 15B, and Leaf Rust in Two Crosses of Vulgare Wheats1

Guy L. Jones and E. R. Ausemus2

Synopsis: Inheritance of seedling reaction to stem rust race 15B was studied in the F, and F, generations of two crosses, Frontana x Mida-Kenya 117A and Kenya 58-Newthatch x Frontana, in the greenhouse at high temperatures (85° F.). Seedling reaction of the same F4 bulked lines to stem rust races 11, 17, 36, 38, and 56 and leaf rust races 5 and 15 were also studied. Stem and leaf rust reaction in the field to a collection of races was studied in the F3 generation.

Seedling resistance to stem rust race 15B was conditioned by three independent genes in both the crosses. Seedling reaction to each of the other races of stem and leaf rust appeared to be simply inherited.

1 Contribution from the Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, Minn. Paper No. 3394, Scientific Journal Series, and the Field Crops Research Branch, A.R.S., U.S.D.A., cooperating. Part of a thesis submitted to the faculty of the Graduate School of the University of Minnesota in partial fulfillment of the requirements for the Ph.D. degree. The writers express their appreciation to Dr. H. K. Hayes, former Head of the Dept. of Agronomy and Plant Genetics, University of Minnesota, for his advice and suggestions regarding conduct of the research and interpretation of results.

2 Formerly graduate student, University of Minnesota, now Associate Professor, Department of Field Crops, North Carolina State College, Raleigh, N. C. and Senior Agronomist F.C.R.S., A.R.S., U.S.D.A., respectively.

Received for publication February 1, 1956.




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Copyright © 1956 by the American Society of Agronomy.