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Journal Article

Inheritance of Dicamba Resistance in Wild Mustard (Brassica Kaber)

Marie Jasieniuk, Ian N. Morrison and Anita L. Brûlé-Babel
Weed Science
Vol. 43, No. 2 (Apr. - Jun., 1995), pp. 192-195
Stable URL: http://www.jstor.org/stable/4045482
Page Count: 4
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Inheritance of Dicamba Resistance in Wild Mustard (Brassica Kaber)
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Abstract

The inheritance of resistance to dicamba in wild mustard was determined by making reciprocal crosses between a resistant (R) population derived from a field treated repeatedly with auxin-type herbicides, and a known susceptible (S) population. The resulting F₁ hybrids were selfed to produce F₂ populations and backcrossed to the S parent. At the three- to four-leaf stage, parental, F₁, F₂, and backcross populations were screened for resistance to dicamba at three dosages (50, 200, and 400 g ai ha⁻¹). F₁ progeny survived all dosages and exhibited levels of injury similar to the R parental population. F₂ populations segregated in a 3:1 ratio of R to S phenotypes. Progeny of backcrosses segregated in a 1:1 (R:S) ratio. Responses of the F₁, F₂, and backcross populations to treatment with dicamba indicate that resistance is determined by a single, completely dominant nuclear allele.

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