Weed Technology

Published by: Weed Science Society of America



Weed Technology 19(3):674-682. 2005
doi: 10.1614/WT-04-217R.1

Interspecific Hybridization: Potential for Movement of Herbicide Resistance from Wheat to Jointed Goatgrass (Aegilops cylindrica)1

BRADLEY D. HANSON, CAROL A. MALLORY-SMITH, WILLIAM J. PRICE, BAHMAN SHAFII, DONALD C. THILL, and ROBERT S. ZEMETRA2

2Postdoctoral Research Fellow, Department of Bioagricultural Sciences and Pest Management, Colorado State University, Fort Collins, CO 80523; Professor, Department of Crop and Soil Science, Oregon State University, Corvallis, OR 97331-3002; Statistician, Professor, Professor, and Professor, Department of Plant Soil and Entomological Sciences, University of Idaho, Moscow, ID 83843-2339. Corresponding author's

The transfer of herbicide resistance genes from crops to related species is one of the greatest risks of growing herbicide-resistant crops. The recent introductions of imidazolinone-resistant wheat in the Great Plains and Pacific Northwest regions of the United States and research on transgenic glyphosate-resistant wheat have raised concerns about the transfer of herbicide resistance from wheat to jointed goatgrass via introgressive hybridization. Field experiments were conducted from 2000 to 2003 at three locations in Washington and Idaho to determine the frequency and distance that imidazolinone-resistant wheat can pollinate jointed goatgrass and produce resistant F1 hybrids. Each experiment was designed as a Nelder wheel with 16 equally spaced rays extending away from a central pollen source of ‘Fidel-FS4’ imidazolinone-resistant wheat. Each ray was 46 m long and contained three rows of jointed goatgrass. Spikelets were collected at maturity at 1.8-m intervals along each ray and subjected to an imazamox screening test. The majority of all jointed goatgrass seeds tested were not resistant to imazamox; however, 5 and 15 resistant hybrids were found at the Pullman, WA, and Lewiston, ID, locations, respectively. The resistant plants were identified at a maximum distance of 40.2 m from the pollen source. The overall frequency of imazamox-resistant hybrids was similar to the predicted frequency of naturally occurring acetolactate synthase resistance in weeds; however, traits with a lower frequency of spontaneous mutations may have a relatively greater risk for gene escape via introgressive hybridization.

Nomenclature: Imazamox; jointed goatgrass, Aegilops cylindrica Host. #3 AEGCY; wheat, Triticum aestivum L.

Additional index words: Herbicide-resistant wheat, hybridization, imidazolinone resistant, interspecific hybrids, introgression, outcrossing, pollen-mediated gene flow.

Abbreviations: ALS, acetolactate synthase; BC, backcross generation; DAP, days after planting; PNW, Pacific Northwest.



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Figure 1. Estimated log–logistic models for seven wheat cultivars and jointed goatgrass in the development of the germinator screening technique

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Table 1.Classification and characteristics of soils in 2000 to 2003 winter wheat to jointed goatgrass gene flow field experiments

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Table 2.Cultivar information for wheat and jointed goatgrass used in seed ling screening method development

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Table 3.Summary of daytime weather (6 a.m. to 6 p.m.) during pollination at three wheat-to-jointed goatgrass gene flow experiments from 2000 to 2003 in the Pacific Northwest

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Table 4.Sample location of imidazolinone-resistant hybrids and percent outcrossing in wheat to jointed goatgrass field gene flow experiments from 2000 to 2003

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Table 5.Model parameter estimates, standard errors, and P values estimated by log-logistic regression for shoot height of seven wheat cultivars and jointed goatgrass in the development of the germinator screening technique.a,b

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Table 6.Contrasts between GR50 and b parameters for shoot height of seven wheat cultivars and jointed goatgrass in the development of the germinator screening technique

Received for publication July 19, 2004, and in revised form October 25, 2004, Published with the approval of the Agricultural Experiment Station, University of Idaho, as Journal Article 04719

Letters following this symbol are a WSSA-approved computer code from Composite List of Weeds, Revised 1989. Available only on computer disk from WSSA, 810 East 10th Street, Lawrence, KS 66044-8897.

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