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






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 bdhanson@lamar.colostate.edu
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.
LITERATURE CITED
,
, and
. 2004. Resistance to an imidazolinone herbicide is conferred by a gene on chromosome 6DL in the wheat line cv. 9804. Weed Sci 52:83–90. CrossRef
1993. Jointed goatgrass (Aegilops cylindrica) ecology and interference in winter wheat. Weed Sci 41:388–393. CSA
,
, and
. 1999. Selective control of jointed goatgrass (Aegilops cylindrica) with imazamox in herbicide-resistant wheat. Weed Technol 13:77–82.
1968. Examination of the F1 hybrids of Aegilops cylindrica Host × Triticum aestivum L. Acta Agron. Sci. Hung 17:151–160.
1972. Some aspects of cross-pollination in wheat (Triticum aestivum L.). 1. Pollen concentration in the field as influenced by variety, diurnal pattern, weather conditions and level as compared to the height of the pollen donor. Euphytica 21:185–203. CrossRef
and
. 1991. Biology and control of jointed goatgrass (Aegilops cylindrica), a review. Weed Technol 5:3–17.
and
. 1993. Characterization of root and shoot development of jointed goatgrass (Aegilops cylindrica). Weed Sci 41:353–361.
and
. 1990. Hybridization as an avenue of escape for engineered genes. BioScience 40:438–442. CrossRef, CSA
,
, and
. 1996. The opportunity for escape of engineered genes from transgenic crops. HortScience 31:1080–1085.
2004. Potential for Pollen-Mediated Gene Flow Among Winter Wheat (Triticum aestivum) Cultivars and from Wheat to Jointed Goatgrass (Aegilops cylindrica). Ph.D. dissertation. University of Idaho, Moscow, ID. 134 p.
2004. International survey of herbicide resistant weeds. Web page: http://www.weedscience.org. Accessed May 2004.
,
, and
. 1997. Direct comparison of pollen-mediated movement of native and engineered genes. Euphytica 96:397–403. CrossRef, CSA
1993. CDC Teal hard red spring wheat. Can. J. Plant Sci 73:193–197.
,
, and
. 1996. The evolution and genetics of herbicide resistance in weeds. Weed Sci 44:176–193. CSA
and
. 1929. Aegilops cylindrica Host, a wheat-field weed in Kansas. Trans. Kans. Acad. Sci 32:80–84. CrossRef
and
. 1987. Evolution in the genus Triticum and the origin of cultivated wheat. In E. G. Heyne, ed. Wheat and Wheat Improvement. Agronomy Monogr. 13. Madison, WI: American Society of Agronomy. Pp. 154–164.
1978. Registration of ‘Stephens’ wheat. Crop Sci 18:1097.
,
,
,
,
, and
. 2003. Rapid diagnosis of resistance to sulfonylurea herbicides in monochoria (Monochoria vaginalis). Weed Sci 51:305–311. CrossRef
1997. Registration of ‘TAM 110’ wheat. Crop Sci 37:1978–1979.
and
. 1974. Gene flow in seed plants. Evol. Biol 7:139–220.
,
, and
. 1996. Gene transfer between wheat and Aegilops cylindrica. In Proceedings of the Second International Weed Control Congress. Slagelse, Denmark: Department of Weed Control and Pesticide Ecology. Pp. 441–445.
1927. Goat grass—a weed pest of central Kansas wheat fields. Kans. Agric. Student 7:40–41.
,
, and
. 2002. Infestations of jointed goatgrass and its hybrids with wheat in Oregon wheat fields. Weed Sci 50:737–747. CrossRef
,
, and
. 1977. Registration of ‘Boyer’ barley. Crop Sci 17:672.
1962. New kinds of systematic designs for spacing experiments. Biometrics 18:283–307. CrossRef
,
,
,
, and
. 1992. Tolerance to imidazolinone herbicides in wheat. Plant Physiol 100:882–886. CrossRef, PubMed
and
. 1999. Temperatures and the growth and development of wheat: a review. Eur. J. Agron 10:23–36. CrossRef
and
. 2002. Evolution of herbicide resistance in weeds: initial frequency of target site-based resistance to acetolactate synthase-inhibiting herbicides in Lolium rigidum. Heredity 88:8–13. CrossRef, PubMed, CSA
and
. 1994. Will hybrids of genetically modified crops invade natural communities? Trends Ecol. Evol 9:85–93. CrossRef, CSA
,
, and
. 1994. Resistance to acetolactate synthase inhibiting herbicides. In S. B. Powles and J.A.M. Holtum, eds. Herbicide Resistance in Plants: Biology and Biochemistry. Boca Raton, FL: Lewis. Pp. 83–139. 
,
, and
. 1995. Log–logistic analysis of herbicide dose–response relationships. Weed Technol 9:218–227.
,
,
, and
. 1998. Production of herbicide-resistant jointed goatgrass (Aegilops cylindrica) × wheat (Triticum aestivum) hybrids in the field by natural hybridization. Weed Sci 46:632–634.
1971. An improved acetocarmine squash technique, with special reference to the modified Rattenbury's method of making a preparation permanent. Barley Genet. Newslett 1:71–72.
1994. Wild Wheats: A Monograph of Aegilops L. and Amblyopyrum (Jaub & Spach) Eig (Poaceae). Wageningen Agricultural University Papers. 7(94). 513 p.
and
. 1983. Current status and future prospects for breeding hybrid rice and wheat. Adv. Agron 36:145–214. CrossRef
,
,
,
,
, and
. 2002. Determination of the paternity of wheat (Triticum aestivum) × jointed goatgrass (Aegilops cylindrica) BC1 plants by using genomic in situ hybridization (GISH) technique. Crop Sci 42:939–943.
,
,
, and
. 2001. The fertility of wheat × jointed goatgrass hybrid and its backcross progenies. Weed Sci 49:340–345. Abstract
2004. Background information on jointed goatgrass program—National Jointed Goatgrass Research Program. Web page: http:// www.jointedgoatgrass.org. Accessed May 2004.
,
, and
. 1998. Potential for gene transfer between wheat (Triticum aestivum) and jointed goatgrass (Aegilops cylindrica). Weed Sci 46:313–317. Table 1.
Classification and characteristics of soils in 2000 to 2003 winter wheat to jointed goatgrass gene flow field experiments
Table 2.
Cultivar information for wheat and jointed goatgrass used in seed ling screening method development
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
Table 4.
Sample location of imidazolinone-resistant hybrids and percent outcrossing in wheat to jointed goatgrass field gene flow experiments from 2000 to 2003
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
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