Fitness of Herbicide-Resistant Weeds: Current Knowledge and Implications for Management

Vila‐Aiub, Martin M.

doi:10.3390/plants8110469

Cited by 54 publications

(67 citation statements)

References 81 publications

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“…These studies reveal that fitness costs associated with AHAS Trp574Leu mutant R. sativus plants are evident under a wide range of environmental conditions. The physiological mechanism responsible for fitness costs associated with the Trp574Leu mutation in R. sativus is likely to be associated with the adverse effect of this mutation on AHAS activity relative to the S wild-type 5,19 . Consequently, reduced AHAS activity due to the Trp574Leu mutation could be expressed under resource limiting conditions or in advanced stages of weed life-history.…”

Section: Plant Fitness: Vegetative and Reproductive Traitsmentioning

confidence: 99%

“…The ecological and evolutionary implications of an adaptive mutation, e.g. the AHAS Trp574Leu mutation, depends on multiple interactions between operational factors related to herbicide application, genetic factors related to fitness benefits/costs and biological factors focused on weed ecology and life-history traits 5 . In AHAS herbicide-treated areas, it is expected that the Trp574Leu mutation increases their frequency 5,17 .…”

Section: Eco-evolutionary Implications Of Ahas Herbicide Resistancementioning

confidence: 99%

“…In the AHAS gene, at least 29 resistance-endowing gene mutations in eight conserved amino acids were identified in field-evolved AHAS-resistant weed biotypes 4 . Some of them may alter normal enzymatic activity, resulting in a whole plant fitness cost 5 .…”

Section: Introductionmentioning

confidence: 99%

“…Mutations conferring herbicide resistance, which enable adaptation to a new environment, may have negative pleiotropic effects, also called fitness costs 6,7 . These fitness costs could influence the persistence and evolution of the adaptive alleles in the absence of the selective agent 5,8 . It has been reported that fitness costs associated with TSR to AHAS herbicides can be manifested in different life-history traits (i.e.…”

Section: Introductionmentioning

confidence: 99%

“…It has been reported that fitness costs associated with TSR to AHAS herbicides can be manifested in different life-history traits (i.e. dormancy, germination, early growth and reproductive outputs) 6,7,9 and differentially expressed depending on the specific mutation 10 , weed species 11,12 and environmental conditions 5,13,14 . There is also a general idea that fitness costs may be more evident under stressful environmental conditions 6,7 , but this prediction has not always been identified 13,14 .…”

Section: Introductionmentioning

confidence: 99%

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Ecological fitness cost associated with the AHAS Trp574Leu mutation in feralRaphanus sativus

Vercellino

Hernández

Pandolfo

et al. 2020

Preprint

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BACKGROUNDGene mutations endowing herbicide resistance may have negative pleiotropic effects on plant fitness. Quantifying these effects is critical for predicting the evolution of herbicide resistance and developing management strategies for herbicide-resistant weeds. This study reports the effects of the acetohydroxyacid synthase (AHAS) Trp574Leu mutation throughout the life cycle of the weed feral radish (Raphanus sativus L.).RESULTSResistant and susceptible biotypes responded differently to light and water treatments in relation to germination and emergence. Under light exposure, the resistant biotype showed higher germination and emergence, but no differences were found in seed dormancy, germination in darkness and emergence from buried seeds or pods. The resistant biotype showed delayed and reduced seedling emergence relative to the susceptible biotype under rainfed conditions, but these differences between the biotypes were not detected in irrigated soil. The biotypes showed similar relative growth rates and vegetative biomass. However, under wheat interference, resistant plants had 36–46% less total above-ground biomass, 26–47% less seeds per plant, and 36–53% less plant yield than susceptible ones, and these differences were more evident at higher plant density.CONCLUSIONThis study provides a better understanding of the ecological fitness cost associated with the AHAS Trp574Leu mutation in feral R. sativus. The fitness costs could reduce the frequency of the resistant allele in areas untreated with AHAS inhibiting herbicides.

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Section: Plant Fitness: Vegetative and Reproductive Traitsmentioning

confidence: 99%

Section: Eco-evolutionary Implications Of Ahas Herbicide Resistancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Ecological fitness cost associated with the AHAS Trp574Leu mutation in feralRaphanus sativus

Vercellino

Hernández

Pandolfo

et al. 2020

Preprint

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Syngenta's contribution to herbicide resistance research and management

Kaundun

2020

Pest Management Science

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The evolution of weed resistance to herbicides is an ever‐increasing problem that affects crop yield and food production. In Syngenta, we believe that this difficult and complex issue can be most efficiently addressed through a deep understanding of the evolutionary dynamics and mechanism of resistance. A profound knowledge of resistance is key to developing the next generation of resistance‐breaking compounds with existing or novel herbicide sites of action. We use a multidisciplinary laboratory‐based, glasshouse and field biology approach to study herbicide resistance and provide strong science‐based solutions to delay the onset and manage resistance. We have developed and implemented simple early‐season resistance detection methods to allow farmers make an informed decision for effective weed control. We have built mechanistic, individual‐based computer models to design profitable, long‐term sustainable weed management programs. Our zero tolerance approaches employ herbicides with different sites of action, applied in mixtures and sequences, to minimise the risk of resistance evolution. Weeds are targeted at the right growth stage with optimal herbicide formulation and spray technology for maximising weed control and depleting the seed bank. We are promoting the use of competitive crop varieties and other nonchemical methods for an integrated weed management strategy. We have a global web of external collaborations for studying and managing herbicide resistance. We are committed to farmers' education and training on herbicide resistance, and regularly share our methods and findings via conferences and peer‐reviewed scientific publications for the benefit of the wider weed science community and field practitioners. © 2020 Society of Chemical Industry

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A dinitroaniline herbicide resistance mutation can be nearly lethal to plants

Wang

Han

Chen

et al. 2022

Pest Management Science

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BACKGROUND: Lolium rigidum is the most important weed in Australian agriculture and pre-emergence dinitroaniline herbicides (e.g., trifluralin) are widely and persistently used for Lolium control. Consequently, evolution of resistance to dinitroaniline herbicides has been increasingly reported. Resistance-endowing target-site ⊍-tubulin gene mutations are identified with varying frequency. This study investigated the putative fitness cost associated with the common resistance mutation Val-202-Phe and the rare resistance mutation Arg-243-Met causing helical plant growth.RESULTS: Results showed a deleterious effect of Arg-243-Met on fitness when plants are homozygous for this mutation. This was evidenced as high plant mortality, severely diminished root and aboveground vegetative growth (lower relative growth rate), and very poor fecundity compared with the wild-type, which led to a nearly lethal fitness cost of >99.9% in competition with a wheat crop. A fitness penalty in vegetative growth was evident, but to a much lesser extent, in plants heterozygous for the Arg-243-Met mutation. By contrast, plants possessing the Val-202-Phe mutation exhibited a fitness advantage in vegetative and reproductive growth. CONCLUSION: The ⊍-tubulin mutations Arg-243-Met and Val-202-Phe have contrasting effects on fitness. These results help understand the absence of plants homozygous for the Arg-243-Met mutation and the high frequency of plants carrying the Val-202-Phe mutation in dinitroaniline-resistant L. rigidum populations. The ⊍-tubulin Arg-243-Met mutation can have an exceptional fitness cost with nearly lethal effects on resistant L. rigidum plants.

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Fitness of Herbicide-Resistant Weeds: Current Knowledge and Implications for Management

Cited by 54 publications

References 81 publications

Ecological fitness cost associated with the AHAS Trp574Leu mutation in feralRaphanus sativus

Ecological fitness cost associated with the AHAS Trp574Leu mutation in feralRaphanus sativus

Syngenta's contribution to herbicide resistance research and management

A dinitroaniline herbicide resistance mutation can be nearly lethal to plants

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