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Published in Crop Sci 8:477-480 (1968)
© 1968 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Association and Inheritance of "Black Chaff" and Stem Rust Reactions in Conley Wheat Crosses1

Shuh-Ji Sheen, David C. Ebeltoft and Glenn S. Smith2

Reactions to "black chaff," a physiologic disease, and to race 15B of stem rust (Puccinia graminis Pers.f.sp. tritici Eriks. & E. Henn.) were controlled by single partially dominant major genes in several crosses with Conley hard red spring wheat (Triticum aestivum L. en. Thell.). Resistance to stem rust was associated with susceptibility to "black chaff" with apparent linkage values ranging from 21 to 24%. Monosomic study ratios suggested that the controlling genes were located on chromosome 3B.

Major genes for 15B stem rust resistance in ‘Conley’ and CT 231 were different and additive in their effects, giving progenies both transgressively resistant and transgressively susceptible. Controlled temperatures during incubation were used to distinguish the dihybrid genotypes.

Key Words: brown necrosis • inter-nodal melanism • linkage • pseudo-black chaff • transgressive segregation

1 Contribution of the Department of Agronomy, Agricultural Experiment Station, North Dakota State University, Fargo 58102, as Journal Series No. 150. Parts of two theses submitted by the senior and second author in partial fulfillment of requirements for the M.S. degree at North Dakota State University.

2 Assistant Professor of Agronomy, University of Kentucky, (formerly graduate assistant), Assistant Professor and Professor of Agronomy, North Dakota State University.

Received for publication January 19, 1968.




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