ALS-Inhibitor Resistance in Populations of Eastern Black Nightshade (<i>Solanum ptycanthum</i>) from Ontario

Ashigh, Jamshid; Tardif, François J.

doi:10.1614/wt-05-034r.1

Cited by 12 publications

(17 citation statements)

References 21 publications

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“…The results of the in vitro ALS activity inhibition assays of HN-02F1-1 plants were consistent with the results of the wholeplant herbicide bioassays. This finding further confirmed that the Ala-205-Val mutation plays an essential role in SU and IMI herbicide resistance, which is similar to the conclusions of other reports (Ashigh and Tardif 2006;Chen et al 2015). Moreover, the HN-02F1-1 plants were highly resistant to TPs; this is the first reported case in which the Ala-205-Val mutation provides resistance to TP herbicides (Tranel et al 2019).…”

Section: In Vitro Assays Of Als Activitysupporting

confidence: 87%

Multiple resistance to PPO and ALS inhibitors in redroot pigweed (Amaranthus retroﬂexus)

Wang

Zhao

et al. 2019

Weed Sci

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A redroot pigweed (Amaranthus retroﬂexus L.) population (HN-02) collected from Nenjiang County, Heilongjiang Province, exhibited multiple resistance to fomesafen and nicosulfuron. The purposes of this study were to characterize the herbicide resistance status of an HN-02 population for both acetolactate synthase (ALS) and protoporphyrinogen oxidase (PPO) inhibitors and the response to other herbicides and to investigate the target site-based mechanism governing fomesafen and nicosulfuron resistance. Three mutations, Ala-205-Val and Trp-574-Leu mutations in the ALS gene and an Arg-128-Gly mutation in the PPX2 gene, were identified in individual resistant plants. An HN-02F1-1 subpopulation homozygous for the Ala-205-Val and Arg-128-Gly mutations was generated, and whole-plant experiments confirmed multiple resistance to PPO inhibitors (fomesafen, fluoroglycofen-ethyl, and acifluorfen) and ALS inhibitors (imidazolinones [IMI], sulfonylureas [SU], and triazolopyrimidines [TP]) in the HN-02F1-1 plants, which presented resistance index values ranging from 8.3 to 110; however, these plants were sensitive to flumioxazin, fluroxypyr-meptyl, and 2,4-D butylate. In vitro ALS enzyme activity assays revealed that, compared with ALS from susceptible plants, ALS from the HN-02F1-1 plants was 15-, 28- and 320-fold resistant to flumetsulam, nicosulfuron, and imazethapyr, respectively. This study confirms the first case of multiple resistance to PPO and ALS inhibitors in A. retroﬂexus and determines that the target-site resistance mechanism was produced by Ala-205-Val and Arg-128-Gly mutations in the ALS gene and PPX2 gene, respectively. In particular, the Ala-205-Val mutation was found to endow resistance to three classes of ALS inhibitors: TP, SU, and IMI.

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Section: In Vitro Assays Of Als Activitysupporting

confidence: 87%

Multiple resistance to PPO and ALS inhibitors in redroot pigweed (Amaranthus retroﬂexus)

Wang

Zhao

et al. 2019

Weed Sci

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“…To increase the safety margin, it will be better if some safeners are developed. The effectiveness of triazine herbicides (atrazine) against Eastern black nightshade ( Solanum ptycanthum ) populations that were resistant to ALS inhibitors (imazethapyr, flumetsulam, cloransulam, nicosulfuron, prosulfuron, and rimsulfuron) was reported by Ashigh and Tardif (2006). Solanum ptycanthum populations resistant to ALS herbicides also were susceptible to chloroacetamide (metolachlor, dimethenamid, and flufenacet).…”

Section: Resultsmentioning

confidence: 99%

“…Metribuzin was found to be effective for the control of isoproturon-R P. minor in wheat but its application timing is narrow, that is, early application can be toxic and delayed application, particularly under untilled conditions without preseeding and an unselective herbicide (glyphosate/paraquat) being less effective (Chhokar et al 2006). To increase the safety margin, it will be better if some safeners are developed.The effectiveness of triazine herbicides (atrazine) against Eastern black nightshade (Solanum ptycanthum) populations that were resistant to ALS inhibitors (imazethapyr, flumetsulam, cloransulam, nicosulfuron, prosulfuron, and rimsulfuron) was reported by Ashigh and Tardif (2006). Solanum ptycanthum populations resistant to ALS herbicides also were susceptible to chloroacetamide (metolachlor, dimethenamid, and flufenacet).…”

Section: Response Of Triazine and Dinitroaniline Against Multiple Hermentioning

confidence: 99%

Multiple herbicide resistance in littleseed canarygrass (Phalaris minor): A threat to wheat production in India

Chhokar¹,

Sharma

2008

Weed Biology and Management

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Littleseed canarygrass (Phalaris minor Retz.), a troublesome weed of wheat in India, has evolved multiple herbicide resistance across three modes of action: photosynthesis at the photosystem II site A, acetyl-coA carboxylase (ACCase), and acetolactate synthase inhibition.The multiple herbicide-resistant (MHR) populations had a low level of sulfosulfuron resistance but a high level of resistance to clodinafop and fenoxaprop (ACCase inhibitors). Some of the populations had GR50 (50% growth reduction) values for clodinafop that were 11.7-fold greater than that of the most susceptible population.The clodinafop-resistant populations also showed a higher level of cross-resistance to fenoxaprop (fop group) but a low level of cross-resistance to pinoxaden (den group). Although clodinafop and pinoxaden are from two different chemical families (fop and den groups), their same site of action is responsible for cross-resistance behavior. The populations that were resistant to four groups of herbicides (phenylureas, sulfonylurea, aryloxyphenoxypropionate, and phenylpyrazolin) were susceptible to the triazine (metribuzin and terbutryn) and dinitroaniline (pendimethalin) herbicides.The P. minor populations that were resistant to the aryloxyphenoxypropionate and phenylurea herbicides were effectively controlled by the sulfonylurea herbicide, sulfosulfuron. In the fields infested with P. minor that was resistant to clodinafop, a sulfosulfuron application (25 g ha -1 ) increased the wheat yield by 99.2% over that achieved using the recommended rate of clodinafop (60 g ha -1 ). However, the evolution of multiple resistance against the four groups is a threat to wheat production.To prevent the spread of MHR P. minor populations, as well as the extension of multiple resistance to new chemicals, concerted efforts in developing and implementing a sound, integrated weed management program are needed.The integrated approach, consisting of crop and herbicide rotation with cultural and mechanical weed control tactics, should be considered as a long-term resistance management strategy that will help to sustain wheat productivity and farmers' income.

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“…Since 1999, 12 populations of S. ptychanthum from different locations in Ontario have been confirmed R to imazethapyr (Ashigh & Tardif, 2006). A single point mutation coding for Ala 205 Val substitution confers resistance in these populations.…”

Section: Introductionmentioning

confidence: 97%

An amino acid substitution at position 205 of acetohydroxyacid synthase reduces fitness under optimal light in resistant populations of Solanum ptychanthum

Ashigh

Tardif

2009

Weed Research

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The Ala 205 Val substitution in acetohydroxyacid synthase confers herbicide resistance in Solanum ptychanthum, but the effect on fitness is unknown. This study aimed to compare the germination, growth, seed production and competitiveness of resistant (R) and susceptible (S) populations under various light conditions in the field and in a controlled environment. Under optimal light conditions of high irradiance and high red ⁄ far-red, the S populations produced more seeds compared with R populations, despite no difference in germination and above-ground vegetative productivity. Any reduction in light intensity and red ⁄ far-red diminished the repro-ductive ability of both R and S populations. This effect was more pronounced for S, so that, under sub-optimal conditions, there were no differences between the two types. Replacement series with three ratios of R:S (16:0, 8:8 and 0:16) showed no competitive difference between the two types. Under optimal light conditions, the S populations always had a higher reproductive output and fitness than the R populations. This would likely cause S individuals to dominate in the absence of herbicide selection pressure, if light competition is reduced.

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ALS-Inhibitor Resistance in Populations of Eastern Black Nightshade (Solanum ptycanthum) from Ontario

Cited by 12 publications

References 21 publications

Multiple resistance to PPO and ALS inhibitors in redroot pigweed (Amaranthus retroﬂexus)

Multiple resistance to PPO and ALS inhibitors in redroot pigweed (Amaranthus retroﬂexus)

Multiple herbicide resistance in littleseed canarygrass (Phalaris minor): A threat to wheat production in India

An amino acid substitution at position 205 of acetohydroxyacid synthase reduces fitness under optimal light in resistant populations of Solanum ptychanthum

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