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Evaluation of mesotrione tolerance levels and [14C]mesotrione absorption and translocation in three fine fescue species

Published online by Cambridge University Press:  20 August 2019

Trent M. Tate Open the ORCID record for Trent M. Tate [Opens in a new window] ,
William A. Meyer ,
Patrick E. McCullough  and
Jialin Yu
Trent M. Tate*
Affiliation:
Field Researcher IV, Rutgers University, Plant Biology, New Brunswick, NJ, USA
William A. Meyer
Affiliation:
Professor, Rutgers University, Plant Biology, New Brunswick, NJ, USA
Patrick E. McCullough
Affiliation:
Associate Professor, Crop and Soil Sciences, University of Georgia, Griffin, GA, USA
Jialin Yu
Affiliation:
Postdoctoral Researcher, Crop and Soil Sciences, University of Georgia, Griffin, GA, USA
*
Author for correspondence: Trent M. Tate, Rutgers University, 59 Dudley Road, New Brunswick, NJ 08901. Email: [email protected]
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Abstract

Fine fescues (Festuca spp.) are cool-season grasses used in low-maintenance turf areas. Mesotrione is a PRE and early-POST herbicide used during establishment of most cool-season turfgrasses, excluding fine fescues. Currently, efforts are being made to breed for increased tolerance to mesotrione in fine fescues to enhance weed control during establishment. This study was conducted to evaluate the association of foliar and root uptake of [14C]mesotrione with the tolerance of three lines each of Chewings fescue [Festuca rubra ssp. commutata Gaudin; syn. F. rubra ssp. fallax (Thuill.) Nyman], hard fescue [Festuca trachyphylla (Hack.) Hack.], and strong creeping red fescue (Festuca rubra L. ssp. rubra) lines. From a rate-titration experiment, the hierarchical rank of species for mesotrione tolerance from highest to lowest was: hard > Chewings > strong creeping red fescue. The hierarchical rank of species for foliar uptake from highest to lowest was: Chewings > strong creeping red > hard fescue. Translocation of foliar-absorbed 14C was not associated with differential tolerance levels of the three species. Root absorption was comparable among species, but differences between lines were detected within the species. The most susceptible lines of Chewings and strong creeping red fescue exhibited greater root uptake than lines with greater tolerance. Hard fescue translocated the least amount of root-absorbed radioactivity to shoots, while Chewings and strong creeping red fescues were comparable.

Keywords

Dean Riechers, University of IllinoisBleaching injuryChewings fescue14C-radiolabeled mesotrionedose responsefoliar absorptionfoliar translocationhard fescuerate titrationroot absorptionroot translocationstrong creeping red fescue
Type
Research Article
Information
Weed Science , Volume 67 , Issue 5 , September 2019 , pp. 497 - 503
Copyright
© Weed Science Society of America, 2019 

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