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Published in Crop Sci 19:309-312 (1979)
© 1979 Crop Science Society of America
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Inheritance of Resistance to Common Bunt in Wheat, C.I. 70901

R. J. Metzger, C. W. Schaller and C. R. Rohde2

The wheat line C.I. 7090 (Triticum aestivum L.) was shown by previous work to carry an unidentified gene(s) for resistance to many races of common [Tilletia caries (DC.) Tul. and T. foetida (Wallr) Liro], and dwarf bunt (T. controversa Kuhn). C.I. 7090 was crossed with completely susceptible cultivars (‘Triumph’ and ‘Elgin’) and with bunt-host differentials. The F3 and F4 progenies of these crosses were analyzed to determine the identity and number of genes involved in resistance. The results showed that a new gene, designated Bt9 was involved and the Bt9 plus Bt7 conferred resistance in C.I. 7090 to 36 of the 41 reported races of common bunt. Inheritance for Bt9 is independent of that for Bt1, 2, 4, 6, and 7.

Key Words: Common smut • Disease resistance • Triticum aestivum L. • Tilletia caries (DC.) Tul. • Tilletia foetida (Wallr.) Liro • Stinking smut • Host-parasite interactions

1 Contribution of the SEA-AR, USDA in cooperation with California Agric. Exp. Stn., Davis, Calif., and Oregon Agric. Exp. Stn., Corvallis, Oreg. Technical paper no. 4761 of the latter

2 Research geneticist, SEA-AR, USDA, Corvallis, OR 97331; professor of agronomy, Univ. of California, Davis, CA 95616; professor of agronomy, Oregon State Univ., Columbia Basin Agric. Res. Ctr., Pendleton, OR 97801, respectively.

Received for publication April 14, 1978.




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