Full TGIF Record # 266201
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Web URL(s):http://www.newss.org/proceedings/proceedings-2015.pdf#page=90
    Last checked: 10/23/2015
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Publication Type:
i
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Content Type:Abstract or Summary Only
Author(s):Venner, K. A.; Askew, S. D.; Colla'kova', E.; Koo, S.
Author Affiliation:Venner: Chair-Elect, Turfgrass and Plant Growth Regulators Committee; Askew: Chair, NEWSS 2015 Program Committee and Collegiate Weed Contest Committee and Vice President, NEWSS Executive Committee; Virginia Tech, Blacksburg
Title:Effect of methiozolin on 13C-glucose assimilation in annual bluegrass and three turfgrasses
Meeting Info.:Williamsburg, Virginia: January 5-8, 2015
Source:Proceedings of the Sixty-ninth Annual Meeting of the Northeastern Weed Science Society. Vol. 69, 2015, p. 88.
Publishing Information:College Park, Maryland: The University of Maryland
# of Pages:1
Keywords:TIC Keywords: Agrostis stolonifera; Biosynthesis; Cell wall; Glucose; Golf greens; Herbicide evaluation; Methiozolin; Poa annua; Tyrosine aminotransferase
Cultivar Names:PoaCure
Abstract/Contents:"Methiozolin (PoaCure) is a new herbicide developed by the Moghu Research Center in Daejeon, Korea for the safe and selective removal of annual bluegrass (Poa annua) from creeping bentgrass (Agrostis stolonifera) putting greens. Methiozolin is a member of the isoxazoline class of chemistry, and, although two modes of action have been proposed, its mode of action is unknown. In Lemna paucicostata and other broadleaf species, Grossmann et al. (2011) proposed that methiozolin inhibits the function of tyrosine aminotransferase, an important enzyme in the conversion of L-tyrosine to 4- hydroxyphenyl pyruvate (4-HPP). Ultimately, the disruption in this pathway prevents catalysis of phytoene desaturase, an important cofactor in the formation of plastoquinones and tocopherols, important compounds in the protection of plant tissues from oxidative stress. The other proposed mode of action is cell wall biosynthesis inhibition. Lee et al. (2007) proposed that methiozolin acts as a cell wall biosynthesis inhibitor (CBI) based on research suggesting this herbicide inhibits the incorporation of 14C-glucose into plant cell walls. In studies investigating the incorporation of 14Cglucose in corn root tips, Lee et al (2007) noted decreased levels of incorporation in the cellulose and hemicellulose constituents of the cell walls, similar to what is observed with known cell wall biosynthesis inhibiting herbicides, like dichlobenil. Again, similar to other CBI-type herbicides, methiozolin induced a change in the coleoptile of barnyardgrass seedlings, broadening and thinning the coleoptile. A color change was also noted. Although these symptoms are different from other known CBI-type herbicides, the morphological change could further indicate a CBI mode of action. Studies were conducted at Virginia Tech in 2014 in order to elucidate whether or not methiozolin influences the incorporation of 13C-labeled glucose into the cell walls of annual bluegrass (Poa annua), Kentucky bluegrass (Poa pratensis), creeping bentgrass (Agrostis stolonifera) and perennial ryegrass (Lolium perenne), one susceptible and three known tolerant turfgrass species to methiozolin, respectively. The treatment design was a factorial, turfgrass species by herbicide rate. Treatments were as follows: methiozolin at 0.01 and 1.0 uM, methiozolin at 1 uM + 4-HPP, indaziflam at 700 pM and a non-treated was included for comparison. Plants were treated for 24 hours in herbicide solution and subsequently transferred to a 10mM solution of 13C-glucose for 72 hours to allow for incorporation. Hydrolized cell walls were derivitized to individual hexose and pentose sugars. Each sample was evaluated using a gas chromatographymass spectrometer. Preliminary data analysis suggests that levels of 13C-glucose incorporation in cell walls was [were] poor, but analysis is ongoing."
Language:English
References:0
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Venner, K. A., S. D. Askew, E. Colla'kova', and S. Koo. 2015. Effect of methiozolin on 13C-glucose assimilation in annual bluegrass and three turfgrasses. Proc. Annu. Meet. Northeast. Weed Sci. Soc. 69:p. 88.
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Web URL(s):
http://www.newss.org/proceedings/proceedings-2015.pdf#page=90
    Last checked: 10/23/2015
    Requires: PDF Reader
    Notes: Item is within a single large file
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