Inheritance of resistance to Ustilago levis (K & S) Magn. (Covered smut) in a cross between Markton and Colorado 37 oats
1936
Austin, W.W. | Robertson, D.W.
Markton (C. I. No. 2053), found to be resistant to a mixture of covered smut found at the Colorado State College Experiment Station, was used as the resistant parent. Colorado 37 (C. I. No. 1640), found to be susceptible to a mixture of the same smut, was used as the susceptible parent due to its yielding ability and other desirable characteristics. The inoculum used was collected from a field of Colorado, 37 growing at the Colorado Experiment Station, Fort Collins, Colo. The smut was identified as Ustilago levis (K & S) Magn. All seeds used in the study were dehulled and smutted. The F2 results were erratic and no conclusions could be drawn from them without further study. The F3 families segregated in the ratio of 9 uninfected to 7 infected. It was concluded that a two-factor difference for smut exists between the parents; Markton possessing the two dominant factors for resistance, while Colorado 37 has the recessive allelomorphs of these factors. Some very promising, highly resistant lines are being continued in the hope of developing some high-yielding, smut-resistant, commercial strains.
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