Transfer of resistance alleles from herbicide-resistant to susceptible grass weeds via pollen-mediated gene flow

Jhala, Amit J.; Beckie, Hugh J.; Mallory‐Smith, Carol; Jasieniuk, Marie; Busi, Roberto; Norsworthy, Jason K.; Bagavathiannan, Muthukumar; Tidemann, Breanne D.; Geddes, Charles M.

doi:10.1017/wet.2021.82

Cited by 10 publications

(6 citation statements)

References 177 publications

(204 reference statements)

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“…Different mutations can evolve in response to the herbicide selection pressure imposed on weed populations and the spread of resistance alleles can occur with gene flow via pollen and/or seed dispersal and by independent evolution within weed populations, which is typically due to local selection for existing mutations rather than de novo events. [43][44][45] Because B. tectorum is predominantly selfpollinated, it is likely that selection for ACCase resistance occurred independently within the UDB-2 population and the spread of herbicide resistance alleles has been primarily through seedmediated gene flow. However, the transfer of herbicide-resistant alleles via pollen-mediated gene flow cannot be ruled out as outcrossing can occur at low rates (0.27 to 1.33%) in this species.…”

Section: Discussionmentioning

confidence: 99%

First report of target‐site resistance to ACCase‐inhibiting herbicides in Bromus tectorum L.

Ribeiro

Brunharo

Mallory‐Smith

et al. 2023

Pest Management Science

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BackgroundThe prevalent and repeated use of acetyl‐coenzyme A carboxylase (ACCase)‐inhibiting herbicides for Bromus tectorum L. control in fine fescue (Festuca L. spp) grown for seed has selected ACCase‐resistant B. tectorum populations. The objectives of this study were to (1) evaluate the response of nine B. tectorum populations to the ACCase inhibitors clethodim, sethoxydim, fluazifop‐P‐butyl, and quizalofop‐P‐ethyl and the acetolactate synthase (ALS) inhibitor sulfosulfuron and (2) characterize the resistance mechanisms.ResultsBromus tectorum populations were confirmed to be resistant to the ACCase‐inhibiting herbicides tested. The levels of resistance varied among the populations for clethodim (resistance ratio, RR = 5.1–14.5), sethoxydim (RR = 18.7–44.7), fluazifop‐P‐butyl (RR = 3.1–40.3), and quizalofop‐P‐ethyl (RR = 14.5–36). Molecular investigations revealed that the mutations Ile2041Thr and Gly2096Ala were the molecular basis of resistance to the ACCase‐inhibiting herbicides. The Gly2096Ala mutation resulted in cross‐resistance to the aryloxyphenoxypropionate (APP) herbicides fluazifop‐P‐butyl and quizalofop‐P‐ethyl, and the cyclohexanedione (CHD) herbicides clethodim, and sethoxydim, whereas Ile2041Thr mutation resulted in resistance only to the two APP herbicides. All B. tectorum populations were susceptible to sulfosulfuron (RR = 0.3–1.7).ConclusionsThis is the first report of target‐site mutations conferring resistance to ACCase‐inhibiting herbicides in B. tectorum. The results of this study suggest multiple evolutionary origins of resistance and contribute to understanding the patterns of cross‐resistance to ACCase inhibitors associated with different mutations in B. tectorum. © 2023 The Authors. Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.

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Section: Discussionmentioning

confidence: 99%

First report of target‐site resistance to ACCase‐inhibiting herbicides in Bromus tectorum L.

Ribeiro

Brunharo

Mallory‐Smith

et al. 2023

Pest Management Science

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“…For self‐pollinated B. syzigachne , the probability of herbicide resistance caused by natural variation (<10 −6 ) is lower than that caused by pollen flow within 10 m 44,45 . At present, farmers are increasingly relying on the use of herbicides.…”

Section: Discussionmentioning

confidence: 99%

“…For self-pollinated B. syzigachne, the probability of herbicide resistance caused by natural variation (<10 −6 ) is lower than that caused by pollen flow within 10 m. 44,45 At present, farmers are increasingly relying on the use of herbicides. Under the pressure of long-term herbicide selection, the spread of resistance genes will play a leading role in the evolution of the population.…”

Section: Discussionmentioning

confidence: 99%

Pollen‐mediated flow of herbicide resistance genes in Beckmannia syzigachne

Chun

Zhuang

et al. 2022

Pest Management Science

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BACKGROUND: Beckmannia syzigachne (Steud.) Fernald has evolved herbicide resistance due to the long-term sole use of herbicides and has become a dominant weed in wheat fields in the middle and lower reaches of the Yangtze River in China. In addition to the selection pressure imposed by herbicides, pollen-mediated gene flow (PMGF) has been reported to cause the spread of herbicide resistance between populations within a certain range in some farmland weeds. It is not clear whether the same is true for the self-pollinated grass weed B. syzigachne. RESULTS:In this study, we confirmed and quantified the level of PMGF in B. syzigachne through concentric circle planting and herbicide resistance tests. Results show that when the B. syzigachne pollen donor was close to the recipient (0.5 m), the average gene flow was 0.66%. Gene flow was detected as far as 10 m (the farthest distance studied) and decreased exponentially with increasing distance, which could be described by a double exponential decay model. Temperature also affected gene flow, whilst the average level of gene flow in all directions of wind was similar and wind speed caused insignificant difference in gene flow. CONCLUSION:The results of this study confirmed that PMGF can occur between B. syzigachne populations in adjacent fields. Although the level of resistance spreading by pollen was low, especially across long distance, the results were relevant for smallholding farms, which is the dominant form of agricultural operation in China. It is therefore important to take proactive measures and integrate chemical and ecological weed control methods to prevent the spread of resistant B. syzigachne via both seeds and pollens.

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“…Therefore, diversified weed management strategies, including cultural, biological, mechanical, and chemical weed management (with multiple sites of action), are needed to manage herbicide-resistant weed seed banks. More specifically, multi-tactic strategies that target multiple life stages of the weed, including understanding reproductive biology and potential for pollen-mediated gene flow, are required (Jhala et al 2021a(Jhala et al , 2021b. This can be accomplished by using an effective multiple-sites-of-action herbicide program, using cover crops, planting corn or soybean in narrow rows, using a harvest weed seed control method, and adopting diversified crop rotations (Mohler et al 2021;Striegel and Jhala 2022).…”

Section: Weed Technologymentioning

confidence: 99%

4-Hydroxyphenylpyruvate dioxygenase (HPPD)-inhibiting herbicides: past, present, and future

et al. 2022

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The 4-hydroxyphenylpyruvate dioxygenase (HPPD)-inhibiting herbicides are primarily used for weed control in corn, barley, oat, rice, sorghum, sugarcane, and wheat production fields in the United States. The objectives of this review were to summarize (1) the history of HPPD-inhibitor and their use in the United States, (2) HPPD-inhibitor resistant weeds, their mechanism of resistance, and management, (3) interaction of HPPD-inhibitor with other herbicides, and (4) the future of HPPD-inhibitor-resistant crops. As of 2022, three broadleaf weeds (Palmer amaranth, waterhemp, and wild radish) have evolved resistance to the HPPD-inhibitor. The predominance of metabolic resistance to HPPD-inhibitor was found in aforementioned three weed species. Management of HPPD-inhibitor-resistant weeds can be accomplished using alternate herbicides such as glyphosate, glufosinate, 2,4-D, or dicamba; however, metabolic resistance poses a serious challenge, as the weeds may be cross-resistant to other herbicide sites of action, leading to limited herbicide options. The HPPD-inhibitor is commonly applied with photosystem II (PS II)-inhibitor to increase efficacy and weed control spectrum. The synergism with HPPD-inhibitor arises from depletion of plastoquinones, which allows increased binding of PS II-inhibitor to the D1 protein. New HPPD-inhibitor from azole carboxamides class is in development and expected to be available in the near future. The HPPD-inhibitor-resistant crops have been developed through overexpression of a resistant bacterial HPPD enzyme in plants and the overexpression of transgenes for HPPD and a microbial gene that enhances the production of HPPD substrate. Isoxaflutole-resistant soybean is commercially available, and it is expected that soybean resistant to other HPPD-inhibitor such as mesotrione, stacked with resistance to other herbicides, will be available in the near future.

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Transfer of resistance alleles from herbicide-resistant to susceptible grass weeds via pollen-mediated gene flow

Cited by 10 publications

References 177 publications

First report of target‐site resistance to ACCase‐inhibiting herbicides in Bromus tectorum L.

First report of target‐site resistance to ACCase‐inhibiting herbicides in Bromus tectorum L.

Pollen‐mediated flow of herbicide resistance genes in Beckmannia syzigachne

4-Hydroxyphenylpyruvate dioxygenase (HPPD)-inhibiting herbicides: past, present, and future

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