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Monosomic Analysis for Bunt Resistance in Derivatives of Turkey and Oro Wheats¹

The "Turkey" factor for resistance to bunt, Tilletia foetida (Wallr.) Liro, in wheat, Triticum aestivum L., has been placed on chromosome 1B through the use of the monosomic analysis technique. Two varieties derived from ‘Turkey’ wheat, ‘Omaha’ and ‘Nebred,’ and two ‘Oro’ wheat derivatives, ‘Bison’ and ‘Kaw,’ were each crossed to monosomic 1B plants of ‘Wichita’ wheat and to one additional randomly available monosomic line. Before seeding, the seeds were dusted with chlamydospores of a collection of bunt maintained at the Nebraska Agricultural Experiment Station. In the field, F₂ populations from F₁ monosomic IB plants had significantly lower percentages of diseased plants than those from sib F₁ disomic plants or from F₁ plants monosomic for the other chromosomes. Greenhouse data were less conclusive. As a group, the F₂ populations from the monosomic chromosome 1B had significantly lower percentage of diseased plants than either those from sister disomic F₁ plants or those from F₁ plants monosomic for a chromosome other than 1B.

Key Words: Triticum • Genes • Chromosome Location • Disease resistance

² Professors of Agronomy, University of Nebraska, and Research Agronomist, Crops Research Division, ARS, USDA, Lincoln, Nebr. 68503.

Received for publication May 5, 1968.