Factors which modify the resistance of wheat to bunt, Tilletia tritici

Briggs, F

Factors which modify the resistance of wheat to bunt, Tilletia tritici

Author

Fred N. Briggs

Author Affiliations

Fred N. Briggs was Associate Pathologist, Office Cereal Crops and Diseases, Bureau of Plant Industry, United States Department of Agriculture, and Associate in Agronomy, California Agricultural Experiment Station.

Publication Information

Hilgardia 4(7):175-184. DOI:10.3733/hilg.v04n07p175. November 1929.

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Abstract

Abstract does not appear. First page follows.

In an earlier publication⁽²⁾4 the author presented data which indicated that Martin wheat differs from such susceptible varieties of wheat as White Federation and Hard Federation in one main dominant factor for resistance to bunt, Tilletia tritici, and that Hussar wheat differs from these susceptible varieties in two main factors for resistance, one of which was shown to be identical with the Martin factor.

Because some susceptible plants nearly always escape infection it was necessary to classify F₂ on the basis of percentages of bunt in F₃ rows which were grown from the seed of individual F₂ plants. Although Martin and Hussar were completely free from bunted plants, there were not enough bunt-free F₃ rows to make up the resistant classes. A few rows with a low percentage of bunt had to be included in the resistant groups. At that time it was pointed out that the presence of a few diseased plants in resistant rows might be due to modifying factors. Also it was suggested that genetically resistant plants occasionally might become infected.

Literature Cited

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[2] Briggs Fred N. Inheritance of resistance to bunt, Tilletia tritici (Bjerk.) Winter, in wheat. Jour. Agr. Res. 1926. 32:973-990.

[3] Castle W. E. The inconstancy of unit characters. American Naturalist. 1912. 46:352-362. DOI: 10.1086/279284 [CrossRef]

[4] Castle W. E., Philips John C. Piebald rats and selection. Carnegie Inst. Wash. Pub. 1914. 195:1-154. DOI: 10.1086/279719 [CrossRef]

[5] Faris James A. Factors influencing the infection of wheat by Tilletia tritici and Tritici levis. Mycologia. 1924. 16:259-282. DOI: 10.2307/3753446 [CrossRef]

[6] Gaines E. F. New physiologic forms of Tilletia levis and Tilletia tritici. Phytopathology. 1928. 18:579-588.

[7] Reed G. M. Physiologic races of bunt of wheat. Amer. Jour. Bot. 1928. 15:157-170. DOI: 10.2307/2435660 [CrossRef]

[8] Rodenhiser H. A. Physiologic specialization in some cereal smuts. Phytopathology. 1928. 18:995-1003.

[9] Tisdale W. H., et al. Relative resistance of wheats to bunt in the Pacific Coast states. U. S. Dept. Agr. Dept. Bul. 1925. 1299:1-30.

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