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| Web URL(s): | http://www.swss.ws/wp-content/uploads/docs/2013 Proceedings-SWSS.pdf#page=328
Last checked: 08/12/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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| Publication Type:
| Report |
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| Author(s): | McElroy, J. S.;
Flessner, M. L.;
Walker, R. H.;
Chen, S. |
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| Author Affiliation: | Auburn University, Auburn, AL |
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| Title: | Annual bluegrass resistant to ALS-inhibiting herbicides |
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| Section: | Weed management in turf
Other records with the "Weed management in turf" Section
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| Meeting Info.: | Houston, Texas: January 28-30, 2013 |
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| Source: | Proceedings of the Southern Weed Science Society: 66th Annual Meeting. Vol. 66, 2013, p. 241. |
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| Publishing Information: | Champaign, Illinois: Southern Weed Science Society |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Acetolactate synthase-inhibiting herbicides; Alleles; Genetic analysis; Genomes; Herbicide evaluation; Herbicide resistance; Poa annua; Turfgrass profile
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| Abstract/Contents: | "Annual bluegrass (Poa annua) is a low-growing grass species common in turfgrass throughout the world. Annual bluegrass is adapted to diverse climates and adapts rapidly to herbicide management practices. Annual bluegrass is an allotetraploid with Poa infirma and Poa supine as its diploid progenitors and it is suspected that polyploidy aids its adaptability. Annual bluegrass management with herbicides has become more problematic due to resistance development to almost all modes of action used. ALS-inhibiting herbicides are a popular choice for annual bluegrass control in both warm and cool-season turfgrass species. Annual bluegrass plants left uncontrolled by ALS-inhibiting herbicides were collected from Grand National Golf Course in Opelika, AL (GN population) for comparison in greenhouse experiments with a susceptible population (AU population). Treatments included foramsulfuron at 25 and 50 g ai/ha, trifloxysulfuron at 16 and 32 g ai/ha, bispyribac at 150 and 300 g ai/ha, and imazaquin at 490 and 980 g ai/ha. These herbicides were selected to encompass three ALS-inhibiting herbicide families, sulfonylurea, pyrimidinyl benzoates, and imidazolinone, and because they are registered for annual bluegrass control in turfgrass. Testing confirmed resistance of the GN population to these herbicides when compared to a susceptible population collected locally at Auburn University (AU population). Further research was conducted to determine the molecular basis of resistance. Sequencing of the GN population ALS gene revealed a point mutation resulting in an amino acid substitution of Trp574 to Leu574. No such point mutation was observed for the AU population. Cloning of the GN population ALS gene surrounding the Trp574 region yielded two distinct ALS gene sequences - one encoding Trp574 and one producing Leu574. Trp574 to Leu574 has been previously correlated with resistance to ALS-inhibiting herbicides. Diploid progenitors Poa supine (paternal parent) and Poa infirma (maternal parent) were sequenced to compare to annual bluegrass. By comparing nucleic acid sequences it was determined that the resistant allele arose from the Poa infirma maternal genome. Thus, the GN annual bluegrass can be said to be homozygous for the resistant allele within the maternal Poa infirma ancestral genome and produce both resistant and susceptible homeologous alleles from its progenitor parent genomes." |
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| Language: | English |
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| References: | 0 |
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| Note: | This item is an abstract only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
McElroy, J. S., M. L. Flessner, R. H. Walker, and S. Chen. 2013. Annual bluegrass resistant to ALS-inhibiting herbicides. South. Weed Sci. Soc. Proc. 66:p. 241. |
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| Web URL(s):
http://www.swss.ws/wp-content/uploads/docs/2013 Proceedings-SWSS.pdf#page=328
Last checked: 08/12/2013
Requires: PDF Reader
Notes: Item is within a single large file |
| 
MSU catalog number: b2207931 |
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Digitally in TIC by file name: swssp2013 |
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