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Inheritance of diclofop resistance in wild oat (Avena fatua L.) biotypes from the Willamette Valley of Oregon

  • Steven S. Seefeldt, David L. Hoffman (a1), David R. Gealy (a2) and E. Patrick Fuerst (a3)

Abstract

Inheritance of resistance to diclofop was studied in three wild oat biotypes (designated B, C., and H) from the Willamette Valley of Oregon. Cultivated oat (cultivar ‘Monida’) was crossed, including reciprocals, to three wild oat biotypes. Leaves of each F1 plant were spotted with diclofop as a nondestructive test for resistance or susceptibility. All F1 hybrids were resistant, indicating that resistance is dominant and is under nuclear control. The F2 plants where Monida was the maternal parent were screened with diclofop, and F2 plants of the Monida/C cross were screened with fenoxaprop because the parent C biotype was resistant to fenoxaprop. At lower doses, a 3:1 (R:S) segregation ratio in F2 was observed and at higher doses a 1:3 (R:S) segregation ratio was often observed. The F2:3 families segregated in a 1:2:1 (all resistant : segregating resistant and susceptible all susceptible) ratio when treated with a 1.1-kg ae ha−1 dose of diclofop. This confirms that resistance to diclofop in the B, C, and H biotypes is primarily under monogenic control, with resistance being dominant to susceptibility at lower herbicide doses. At increased doses, susceptibility becomes dominant. Knowledge of the inheritance of resistance may help in the development of containment measures to prevent the spread of herbicide-resistance genes.

Copyright

Corresponding author

Corresponding author. USDA-ARS, Washington State University, Pullman, WA 99164; seefeldt@wsu.edu

References

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Keywords

Inheritance of diclofop resistance in wild oat (Avena fatua L.) biotypes from the Willamette Valley of Oregon

  • Steven S. Seefeldt, David L. Hoffman (a1), David R. Gealy (a2) and E. Patrick Fuerst (a3)

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