Full TGIF Record # 325015
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Web URL(s):https://scisoc.confex.com/scisoc/2022am/meetingapp.cgi/Paper/142053
    Last checked: 01/31/2023
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Publication Type:
Content Type:Abstract or Summary only
Author(s):Putri, Atikah; Singh, Varsha; Te-Ming, Tseng; McCurdy, James D.
Author Affiliation:Putri: Presenting Author and Mississippi State University; Singh, Te-Ming and McCurdy: Mississippi State University
Title:Glutathione s-transferases (GST) activity of quinclorac-resistant smooth crabgrass (Digitaria ischaemum)
Section:Turfgrass pest management poster: Diseases, insects, weeds I (includes student competition)
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C05 turfgrass science
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Meeting Info.:Baltimore, Maryland: November 6-9, 2022
Source:ASA, CSSA, SSSA International Annual Meeting. 2022, p. 142053.
Publishing Information:[Madison, Wisconsin]: [American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America]
# of Pages:1
Abstract/Contents:"The auxin-mimicking herbicide quinclorac controls crabgrass (Digitaria spp.) post-emergence in cool- and warm-season turfgrass species. Quinclorac-resistance has been confirmed in smooth crabgrass (D. ischaemum) in Mississippi and California. Within the study of herbicide-resistant plants, the identification of target site-resistant populations has proven to be relatively straightforward, while the study and elucidation of resistance mechanisms involved in enhanced metabolism has proven to be more problematic. Research was conducted to identify the glutathione S-transferase (GST) enzyme familys activity in resistant populations (MSU1 and MSU2) relative to a susceptible biotype (S). GST enzyme families may be responsible for the detoxification of quinclorac herbicide in resistant populations. MSU1, MSU2, and S populations were treated with 0, 0.84, and 7.6 kg quinclorac ha-1. Three days after treatment, all plant tissues were harvested, protein was extracted, and reduced glutathione was analyzed for conjugation with a standard substrate, 1-chloro-2,4-dinitrobenzene (CDNB). Pairwise comparisons of regression models reveal differences in GST specific activity between the susceptible and the two resistant populations. There was no difference between MSU1 and MSU2 GST activity. These results indicate that quinclorac resistance in the smooth crabgrass is due to enhanced GST activity which results in an enhanced capacity to detoxify the herbicide via glutathione conjugation; however, elevated GST activity may be due to a number of confounding factorsprincipally the lack of tissue disruption experienced in susceptible populations due to excess accumulation of cyanide. Future research seeks to identify potential target-site mutations contributing to this phenomenon."
This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Putri, A., V. Singh, T. Te-Ming, and J. D. McCurdy. 2022. Glutathione s-transferases (GST) activity of quinclorac-resistant smooth crabgrass (Digitaria ischaemum). Agron. Abr. p. 142053.
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    Last checked: 01/31/2023
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