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| DOI: | 10.1614/WS-D-14-00091.1 |
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| Web URL(s): | http://www.bioone.org/doi/full/10.1614/WS-D-14-00091.1
Last checked: 05/12/2015
Access conditions: Item is within a limited-access website
http://www.bioone.org/doi/pdf/10.1614/WS-D-14-00091.1
Last checked: 05/12/2015
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| Publication Type:
| Refereed |
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| Author(s): | Cross, Robert B.;
McCarty, Lambert B.;
McElroy, J. Scott;
Tharayil, Nishanth;
Bridges, William C. Jr. |
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| Author Affiliation: | Cross: Graduate Student; McCarty: Professor; Tharayil: Assistant Professor, School of Agriculture, Forestry, and Environmental Sciences; Bridges: Professor, Department of Mathematical Sciences, Clemson University, Clemson, SC; McElroy: Associate Professor, Department of Agronomy and Soils, Auburn University, Auburn, AL |
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| Title: | Comparison of enzyme and growth characteristics in ALS-inhibitor susceptible and resistant annual bluegrass (Poa annua) biotypes |
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| Section: | Physiology/chemistry/biochemistry
Other records with the "Physiology/chemistry/biochemistry" Section
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| Source: | Weed Science. Vol. 63, No. 1, January-March 2015, p. 220-228. |
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| Publishing Information: | Champaign, Illinois: Weed Science Society of America |
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| # of Pages: | 9 |
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| Related Web URL: | http://www.bioone.org/doi/abs/10.1614/WS-D-14-00091.1
Last checked: 05/12/2015
Notes: Abstract only |
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| Keywords: | TIC Keywords: Acetolactate synthase-inhibiting herbicides; Biotypes; Cultivar evaluation; Enzymes; Growth analysis; Growth factors; Herbicide evaluation; Herbicide resistance; Poa annua; Sulfonylurea herbicides; Trifloxysulfuron
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| Abstract/Contents: | "Acetolactate synthase-- (ALS-) inhibiting herbicides are frequently used to control annual bluegrass in managed turfgrass systems. Recently, the number of annual bluegrass populations resistant to these herbicides has increased on golf courses. Previous research involving annual bluegrass resistance to ALS inhibitors has included elucidating the mechanism of resistance and in vivo response of ALS to ALS-inhibiting herbicides. The purpose of this research was to generate baseline information on enzymatic parameters of resistant (R) and susceptible (S) annual bluegrass biotypes and further distinguish these biotypes by comparing vegetative growth and reproductive characteristics. The R biotype contained a mutation in the ALS gene resulting in a Trp574 to Leu amino acid substitution. Compared to the S biotype, the R biotype exhibited a 27- and 10-fold resistance to trifloxysulfuron at the whole-plant level and under in vitro conditions, respectively. No significant differences were observed in substrate concentration at one-half maximum rate of enzyme activity (pyruvate) or extractable ALS activity between biotypes, but the maximum rate of enzyme activity was higher for the R biotype. The feedback inhibition of ALS activity by the branched-chain amino acids was higher for the R biotype than the S biotype, with leucine, valine, and isoleucine inhibiting ALS activity 20, 6, and 4% more in the R biotype, respectively. The R biotype produced more inflorescences and seeds per plant in comparison with the S biotype, but relative growth rates between biotypes were similar at all harvest intervals. Our research provides baseline information regarding ALS enzyme response, vegetative growth, and reproductive characteristics of annual bluegrass biotypes resistant and susceptible to ALS-inhibiting herbicides." |
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| Language: | English |
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| References: | 33 |
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| Note: | Equations
Tables
Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Cross, R. B., L. B. McCarty, J. S. McElroy, N. Tharayil, and W. C. Jr. Bridges. 2015. Comparison of enzyme and growth characteristics in ALS-inhibitor susceptible and resistant annual bluegrass (Poa annua) biotypes. Weed Sci. 63(1):p. 220-228. |
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| DOI: 10.1614/WS-D-14-00091.1 |
| Web URL(s):
http://www.bioone.org/doi/full/10.1614/WS-D-14-00091.1
Last checked: 05/12/2015
Access conditions: Item is within a limited-access website
http://www.bioone.org/doi/pdf/10.1614/WS-D-14-00091.1
Last checked: 05/12/2015
Requires: PDF Reader
Access conditions: Item is within a limited-access website |
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MSU catalog number: b2203399a |
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