Perspectives on non-target site mechanisms of herbicide resistance in weedy plant species using evolutionary physiology

Ghanizadeh, Hossein; Harrington, K.C.

doi:10.1093/aobpla/plx035

Cited by 24 publications

(19 citation statements)

References 39 publications

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“…To study the basis of herbicide resistance, all the mechanisms should be considered. These mechanisms can be classified as target-site resistance (TSR) and non-target-site resistance (NTSR) mechanisms, depending on whether the target protein is involved or not, respectively 16,17 . Currently, imazamox resistance is explained by the appearance of point mutations in the ALS gene (TSR mechanism) 18–20 , the lack of herbicide absorption and translocation 21,22 and the herbicide metabolism 22–24 (all these have NTSR mechanisms) in different grass and broadleaf weeds with resistance to ALS-inhibiting herbicides.…”

Section: Introductionmentioning

confidence: 99%

“…Eight point mutations (Ala122, Pro197, Ala205, Asp 376, Arg377, Trp574, Ser653 and Asn654) have been well described 28,29 , and these mutations show differential cross-resistance patterns to the different chemical families of ALS-inhibiting herbicides. Although TSR mechanisms usually provide high levels of herbicide resistance, some NTSR mechanisms can also provide high levels 16,17 . In fact, several NTSR mechanisms (alone or together with TSR mechanisms) can influence the resistance level within a single plant.…”

Section: Introductionmentioning

confidence: 99%

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Target site as the main mechanism of resistance to imazamox in a Euphorbia heterophylla biotype

Rojano-Delgado

Portugal

Palma-Bautista

et al. 2019

Sci Rep

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Euphorbia heterophylla is a weed species that invades extensive crop areas in subtropical regions of Brazil. This species was previously controlled by imazamox, but the continuous use of this herbicide has selected for resistant biotypes. Two biotypes of E. heterophylla from southern Brazil, one resistant (R) and one susceptible (S) to imazamox, were compared. The resistance of the R biotype was confirmed by dose-response assays since it required 1250.2 g ai ha−1 to reduce the fresh weight by 50% versus 7.4 g ai ha−1 for the S biotype. The acetolactate synthase (ALS) enzyme activity was studied using ALS-inhibiting herbicides from five different chemical families. The R biotype required the highest concentrations to reduce this enzyme activity by 50%. A Ser653Asn mutation was found in the ALS gene of the R biotype. The experiments carried out showed that imazamox absorption and metabolism were not involved in resistance. However, greater 14C-imazamox root exudation was found in the R biotype (~70% of the total absorbed imazamox). Target site mutation in the ALS gene is the principal mechanism that explains the imazamox resistance of the R biotype, but root exudation seems to also contribute to the resistance of this biotype.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Target site as the main mechanism of resistance to imazamox in a Euphorbia heterophylla biotype

Rojano-Delgado

Portugal

Palma-Bautista

et al. 2019

Sci Rep

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“…Continuous applications of herbicides with the same mode of action can result in herbicide-resistant populations of weedy plant species 18,19 . Both target site 20 and non-target site 21 mechanisms can cause resistance to herbicides in weed species.…”

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confidence: 99%

Molecular characteristics of the first case of haloxyfop-resistant Poa annua

Ghanizadeh

Mesarich

Harrington

2020

Sci Rep

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Haloxyfop is one of two acetyl-coenzyme A carboxylase (Accase) inhibitors that is recommended for controlling Poa annua. We have characterised a population of P. annua that had developed resistance to haloxyfop. This resistant population was found to be almost 20 times less sensitive to haloxyfop than a susceptible population based on percentage survival of individuals in two dose-response experiments. However, the haloxyfop-resistant population was still susceptible to clethodim. pre-treatment of resistant individuals with a cytochrome P450 inhibitor, malathion, did not change the sensitivity level of the resistant plants to haloxyfop, suggesting that a non-target site mechanism of resistance involving enhanced metabolism, was not responsible for this resistance in P. annua. Gene sequencing showed that a target site mutation at position 2041, which replaced isoleucine with threonine in the carboxyltransferase (ct) domain of the Accase enzyme, was associated with resistance to haloxyfop in the resistant population. An evaluation of the 3-D structure of the CT domain suggested that, unlike Asn-2041, which is the most common mutation at this position reported to date, Thr-2041 does not change the conformational structure of the CT domain. This is the first study investigating the molecular mechanism involved with haloxyfop resistance in P. annua. Poa annua, an annual C 3 weedy grass in both agricultural and urban systems 1,2 , is one of the world's most widely distributed plant species 2. It is particularly problematic in turf grass, where it is highly tolerant of disturbance and has high fecundity 3. The occurrence of P. annua is often associated with human activities, and is one of the weedy grass species that is often found in seedbanks 4. P. annua is a prolific annual weed with a very short life 2. Notably, it can produce seed throughout most of the year 1. Collectively, these features predispose P. annua to herbicide resistance, since, at any one time, a large number of individuals will experience selection pressure under intense herbicide use 5. P. annua is an allotetraploid (2n = 4 × = 28) species, originating from the hybridization of P. supina as the male parent and P. infirma as the female parent 6. Cultural practices that can help desirable species compete well with P. annua can be used for management of this weedy grass species in turf grasses 7 ; i.e. in an effort to stop it re-establishing from seed after it completes its life cycle. Techniques such as soil aerification, fertilization management and modifying irrigation regimens are useful cultural practices for P. annua management in turf 8. However, cultural techniques should be part of a management package 9 , as these techniques do not result in complete control of P. annua in turf. Indeed, application of herbicides is desirable for complete management of this weed species in turf 10. There are, however, only a limited number of herbicides that can selectively remove P. annua from turf grasses 11. Hence, the best strategy to manage P. annua in tur...

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“…Herbicide resistance in weeds occurs in situations where herbicides with similar modes of action are applied for several years continuously [64]. Currently, there are 13 weed species that have evolved resistance to one or more herbicides in different New Zealand agricultural sectors [38,47,48,[65][66][67][68][69].…”

Section: Herbicide Resistance In New Zealand Pastoral Weedsmentioning

confidence: 99%

Weed Management in New Zealand Pastures

Ghanizadeh

Harrington

2019

Agronomy

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In New Zealand, pastoral farming for dairy and meat production is the major land use. As with any agricultural production system, weeds are a threat to efficient pasture production in New Zealand. In this review, we outline the problems caused by weeds in New Zealand pastures, and the management strategies being used to control them. There are currently 245 plant species from 40 plant families that are considered to be troublesome weeds in New Zealand pastures. The application of herbicides is an important approach to manage weeds in New Zealand pastures; however, a key to the success of these pastures is the use of clovers in combination with the grasses, so the challenge is to find herbicides that selectively control weeds without damaging these legumes. The use of spot spraying and weed wiping are often required to ensure selective control of some weed species in these pastures. Non-chemical agronomic approaches such as grazing management and using competitive pasture species often play a more important role than herbicides for weed management in many New Zealand pastures. Thus, integrated weed management using a combination of herbicides and good pasture management strategies leads to the most cost-effective and efficient control of pasture weeds in New Zealand.

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Perspectives on non-target site mechanisms of herbicide resistance in weedy plant species using evolutionary physiology

Cited by 24 publications

References 39 publications

Target site as the main mechanism of resistance to imazamox in a Euphorbia heterophylla biotype

Target site as the main mechanism of resistance to imazamox in a Euphorbia heterophylla biotype

Molecular characteristics of the first case of haloxyfop-resistant Poa annua

Weed Management in New Zealand Pastures

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