Full TGIF Record # 325021
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Web URL(s):https://scisoc.confex.com/scisoc/2022am/meetingapp.cgi/Paper/141434
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Content Type:Abstract or Summary only
Author(s):Ignes, Martin; McCurdy, James D.; McElroy, J. Scott; Rutland, Claudia Ann; Tseng, Te-Ming Paul; Ferguson, Connor; Stewart, Barry R.; Meredith, Ashley
Author Affiliation:Ignes: Presenting Author and Mississippi State University; McCurdy, Tseng, Stewart and Meredith: Mississippi State University; McElroy: Auburn University; Ferguson: Sesaco Corporation
Title:Dynamics of pronamide within Poa annua
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. 141434.
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 mitotic-inhibiting herbicide pronamide controls susceptible annual bluegrass (Poa annua L.) populations both pre- and post-emergence, but in some resistant populations, post-emergence activity is hypothetically compromised due to the lack of root uptake, unknown foliar resistance mechanisms, or target-site mutation. Plants from three suspected pronamide-resistant (LH-R, SC-R, and SL-R) and two pronamide-susceptible (BS-S and HH-S) annual bluegrass populations were collected from Mississippi. Dose-response experiments were conducted to confirm and quantify the level of pronamide resistance. Target-sites known to confer resistance to other mitotic-inhibiting herbicides were sequenced, as were target-sites for herbicides inhibiting acetolactate synthase (ALS) and photosystem II (PSII). In separate experiments, absorption, and translocation of pronamide were investigated at four different harvest times [8, 24, 72, and 168 hours after treatment (HAT)] following foliar and soil applications. Dose-response experiments confirmed pronamide resistance in LH-R, SC-R, and SL-R populations. Sequencing of the a-tubulin gene confirmed the presence of a mutation that substituted isoleucine for threonine at position 239 (Thr239-Ile) in LH-R, SC-R, SL-R, and BS-S populations. Foliar application experiments did not find differences in pronamide absorption and translocation between the five populations, regardless of harvest time. Most of the applied pronamide (>55%) was not absorbed foliarly. All populations had limited basipetal translocationonly 313% of the absorbed pronamideacross harvest times. Soil application experiments revealed that pronamide translocation generally did not differ between SC-R, SL-R, and both susceptible populations across harvest times. The LH-R population translocated less soil-applied pronamide than the susceptible populations, 24, 72, and 168 HAT, indicating that reduced acropetal translocation may contribute to pronamide resistance. This study reports three new pronamide-resistant populations from Mississippi and suggests that both target-site-based and translocation-based mechanisms may be associated with pronamide resistance in the same population. Further research is needed to confirm the link between the Thr239-Ile mutation and pronamide resistance."
See Also:See also related poster, Dynamics of Pronamide Action Within Poa annua, 2022, R=332872. R=332872
Note:Reprint appears in Proceedings of the Southern Weed Science Society 76th Annual Meeting, Vol. 76, 2023, p. 178
This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Ignes, M., J. D. McCurdy, J. S. McElroy, C. A. Rutland, T.-M. P. Tseng, C. Ferguson, et al. 2022. Dynamics of pronamide within Poa annua. Agron. Abr. p. 141434.
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    Last checked: 01/31/2023
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