Genetic Resistance to Acetyl‐Coenzyme A Carboxylase‐Inhibiting Herbicides in Grain Sorghum

Kershner, Kellan Scott; Al‐Khatib, Kassim; Krothapalli, Kartikeya; Tuinstra, Mitchell R.

doi:10.2135/cropsci2011.02.0082

Cited by 19 publications

(15 citation statements)

References 45 publications

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“…Similarly, total irrigation amounts for sunflower beyond 254 mm were not profitable and the benefit of applying beyond 127 mm of irrigation water to sunflower was less than for corn and soybean. Although relative profitability will change with changes in input costs and grain prices, the greater economic profitability of corn and soybean with greater irrigation over sorghum or sunflower is in agreement with reports by Lamm et al (2007), Klocke et al (2014), and Taylor and Brix (2013).…”

Section: Discussionsupporting

confidence: 83%

Comparison of Corn, Grain Sorghum, Soybean, and Sunflower under Limited Irrigation

Schlegel

Assefa

O’Brien³

et al. 2016

Agronomy Journal

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Corn (Zea mays L.) and soybean [Glycine max (L.) Merr.] constitute a large share of the annual total irrigated planted area in the central Great Plains. This study aimed to determine the effect of limited irrigation on grain yield, water use, and profitability of corn and soybean in comparison with two crops commonly grown in water‐limited environments (grain sorghum [Sorghum bicolor (L.) Moench.] and sunflower [Helianthus annuus L.]). The study was conducted at Tribune, KS, from 2001 to 2008, with a mean April to October rainfall of 390 mm. Treatments were a complete factorial of four crops and three irrigation levels: 127, 254, and 381 mm. At all irrigation levels, the mean grain yield of corn was greater than that of grain sorghum, followed by soybean and sunflower. The grain yield of sorghum, soybean, and sunflower was 19%, 16%, and 33%, greater, respectively, at 254 mm than at 127 mm irrigation, but similar for the 254 and 381 mm irrigation levels. Corn grain yield was 49% greater with 254 mm than with 127 mm irrigation and increased by an additional 17% under 381 mm irrigation. Available soil water in the 0‐ to 30‐cm soil depth at harvest was ∼19 mm for corn and ∼31 mm for sorghum. Under limited irrigation conditions (127 mm), we have concluded that producers have multiple crop choices (corn, sorghum, soybean, or sunflower) with small yield and economic differences and, at higher irrigation levels (254 and 381 mm), a relative yield and economic advantage for corn.

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Section: Discussionsupporting

confidence: 83%

Comparison of Corn, Grain Sorghum, Soybean, and Sunflower under Limited Irrigation

Schlegel

Assefa

O’Brien³

et al. 2016

Agronomy Journal

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“…These included the W2027C mutation which was detected in Alopecurus myosuroides [16] Avena sterilis [32], Lolium [28], Phalaris minor [33] and Sorghum bicolor [34]. In black-grass the W2027C mutation was found to confer resistance to the FOP herbicides clodinafop-propargyl, haloxyfop-P-methyl and fenoxaprop-P-ethyl but not to the DIM herbicides cycloxydim and clethodim [35].…”

Section: Discussionmentioning

confidence: 99%

Role of a Novel I1781T Mutation and Other Mechanisms in Conferring Resistance to Acetyl-CoA Carboxylase Inhibiting Herbicides in a Black-Grass Population

et al. 2013

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BackgroundKnowledge of the mechanisms of herbicide resistance is important for designing long term sustainable weed management strategies. Here, we have used an integrated biology and molecular approach to investigate the mechanisms of resistance to acetyl-CoA carboxylase inhibiting herbicides in a UK black-grass population (BG2).Methodology/Principal FindingsComparison between BG2 phenotypes using single discriminant rates of herbicides and genotypes based on ACCase gene sequencing showed that the I1781L, a novel I1781T, but not the W2027C mutations, were associated with resistance to cycloxydim. All plants were killed with clethodim and a few individuals containing the I1781L mutation were partially resistant to tepraloxydim. Whole plant dose response assays demonstrated that a single copy of the mutant T1781 allele conferred fourfold resistance levels to cycloxydim and clodinafop-propargyl. In contrast, the impact of the I1781T mutation was low (Rf = 1.6) and non-significant on pinoxaden. BG2 was also characterised by high levels of resistance, very likely non-target site based, to the two cereal selective herbicides clodinafop-propargyl and pinoxaden and not to the poorly metabolisable cyclohexanedione herbicides. Analysis of 480 plants from 40 cycloxydim resistant black grass populations from the UK using two very effective and high throughput dCAPS assays established for detecting any amino acid changes at the 1781 ACCase codon and for positively identifying the threonine residue, showed that the occurrence of the T1781 is extremely rare compared to the L1781 allele.Conclusion/SignificanceThis study revealed a novel mutation at ACCase codon position 1781 and adequately assessed target site and non-target site mechanisms in conferring resistance to several ACCase herbicides in a black-grass population. It highlights that over time the level of suspected non-target site resistance to some cereal selective ACCase herbicides have in some instances surpassed that of target site resistance, including the one endowed by the most commonly encountered I1781L mutation.

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“…Target‐site resistance is essentially caused by single amino acid changes in the carboxyltransferase domain impacting on the effective binding of ACCase herbicides . It is therefore not surprising that some earlier studies have shown that target‐site resistance is more or less inherited as a monogenic trait . Exceptions to this rule are threefold increases in ACCase‐specific activity in two resistant S. halepense and Leptochloa chinensis populations from the United States and Thailand respectively .…”

Section: Mechanism Of Resistancementioning

confidence: 99%

Resistance to acetyl‐CoA carboxylase‐inhibiting herbicides

Kaundun

2014

Pest Management Science

200

222

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Resistance to acetyl-CoA carboxylase herbicides is documented in at least 43 grass weeds and is particularly problematic in Lolium, Alopecurus and Avena species. Genetic studies have shown that resistance generally evolves independently and can be conferred by target-site mutations at ACCase codon positions 1781, 1999, 2027, 2041, 2078, 2088 and 2096. The level of resistance depends on the herbicides, recommended field rates, weed species, plant growth stages, specific amino acid changes and the number of gene copies and mutant ACCase alleles. Non-target-site resistance, or in essence metabolic resistance, is prevalent, multigenic and favoured under low-dose selection. Metabolic resistance can be specific but also broad, affecting other modes of action. Some target-site and metabolic-resistant biotypes are characterised by a fitness penalty. However, the significance for resistance regression in the absence of ACCase herbicides is yet to be determined over a practical timeframe. More recently, a fitness benefit has been reported in some populations containing the I1781L mutation in terms of vegetative and reproductive outputs and delayed germination. Several DNA-based methods have been developed to detect known ACCase resistance mutations, unlike metabolic resistance, as the genes remain elusive to date. Therefore, confirmation of resistance is still carried out via whole-plant herbicide bioassays. A growing number of monocotyledonous crops have been engineered to resist ACCase herbicides, thus increasing the options for grass weed control. While the science of ACCase herbicide resistance has progressed significantly over the past 10 years, several avenues provided in the present review remain to be explored for a better understanding of resistance to this important mode of action.

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Genetic Resistance to Acetyl‐Coenzyme A Carboxylase‐Inhibiting Herbicides in Grain Sorghum

Cited by 19 publications

References 45 publications

Comparison of Corn, Grain Sorghum, Soybean, and Sunflower under Limited Irrigation

Comparison of Corn, Grain Sorghum, Soybean, and Sunflower under Limited Irrigation

Role of a Novel I1781T Mutation and Other Mechanisms in Conferring Resistance to Acetyl-CoA Carboxylase Inhibiting Herbicides in a Black-Grass Population

Resistance to acetyl‐CoA carboxylase‐inhibiting herbicides

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