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Production of herbicide-resistant jointed goatgrass (Aegilops cylindrica) × wheat (Triticum aestivum) hybrids in the field by natural hybridization

Published online by Cambridge University Press:  12 June 2017

Steven S. Seefeldt ,
Robert Zemetra ,
Frank L. Young  and
Stephen S. Jones
Robert Zemetra
Affiliation:
Department of Plant, Soil, and Entomological Sciences, University of Idaho, Moscow, ID 83843
Frank L. Young
Affiliation:
USDA/ARS, Washington State University, Pullman, WA 99164
Stephen S. Jones
Affiliation:
Department of Crop and Soil Sciences, Washington State University, Pullman, WA 99164
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Abstract

Imazamox-resistant hybrids resulted from a cross between jointed goatgrass and an imazamox-resistant wheat (cv. FS-4 IR wheat). Two imazamox-resistant hybrids were discovered in a research plot where FS-4 IR wheat seed had been replanted from the harvest of an imazamox efficacy study conducted the year before at a different location. These hybrid plants survived imazamox applied at 0.053 and 0.069 kg ai ha−1 in the field and produced seven viable seeds (BC1). This seed germinated, and chromosomes were counted from the roots (2N number ranged from 39 to 54). In the greenhouse, six of the seven plants survived an application of 0.072 kg ai ha−1imazamox, which confirmed that the resistance trait had been passed to these progeny. A large amount of phenotypic variation was observed in the mature BC1 plants. A genetic description of the movement of the resistant gene is proposed based on the case of the gene being located on the D and the A or B genomes. Management strategies to reduce the occurrence of herbicide-resistant hybrids are presented.

Keywords

Imazamoxbirdsrape mustard, Brassica campestris L. BRSRAjointed goatgrass, Aegilops cylindrica Host AEGCYcanola, Brassica napus L.winter wheat, Triticum aestivum L.Herbicide-resistant cropsgene flowBRSRAAEGCY
Type
Rapid Publication
Information
Weed Science , Volume 46 , Issue 6 , December 1998 , pp. 632 - 634
Copyright
Copyright © 1998 by the Weed Science Society of America 

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Footnotes

Current address: AgResearch, Ruakura Agricultural Research Centre, Hamilton, New Zealand; seefeldts@agresearch.cri.nz

References

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