Forward selection for multiple resistance across the non‐selective glyphosate, glufosinate and oxyfluorfen herbicides in <i>Lolium</i> weed species

Fernández, Pablo; Alcántara, Ricardo; Osuna, M. D.; Vila‐Aiub, Martin M.

doi:10.1002/ps.4368

Cited by 34 publications

(48 citation statements)

References 19 publications

(34 reference statements)

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“…Reduced efficacy of glufosinate at the later growth stages is probably due to the following factors: glufosinate being a contact herbicide, its poor translocation, along with the low growth rate and dry-matter accumulation of the mature plants. In addition, previous studies with glufosinate indicate that its efficacy depends on both environmental conditions and weed species [29,30], while farmers often apply glufosinate after tillering and pose a further risk on its efficacy [19]. Our results are also in accordance with other recent studies [21,25].…”

Section: Dose-response Experimentssupporting

confidence: 93%

“…In the present study, glufosinate rates required to control resistant accessions were about threeto seventimes higher than those required to control the susceptible accessions. These values were either similar to or lower than those reported for L. rigidum in Australia and Spain, respectively [19,27]. Moreover, the differences found between glufosinate-susceptible and -resistant rigid ryegrass biotypes were either equal to or higher than the corresponding values previously confirmed in other gramineous species such as L. perenne and E. indica [8,9,28].…”

Section: Dose-response Experimentssupporting

confidence: 79%

“…Moreover, the results of this study also highlight the importance of the growth stage in order to achieve maximum glufosinate efficacy and minimize the risk of resistance. Further herbicide resistance screening and monitoring should be conducted on a systematic basis and in a range of herbicides, since multiple resistance is another challenge and an additional risk [19,32].…”

Section: Discussionmentioning

confidence: 99%

“…Further to the evolution of resistance, glufosinate became one of the most widespread alternative chemical choices for farmers [17]. Unfortunately, glufosinate resistance and multiple resistance have already been reported in L. rigidum L. due to the accumulation of several resistance mechanisms [18,19]. Rigid ryegrass's ability to evolve different resistance mechanisms is attributed-among other contributory factors-to the following characteristics: its widespread distribution within cropping regions, prolific seed set, cross-fertilization, and, finally, its significant genetic variability and phenotypic plasticity [20].…”

Section: Introductionmentioning

confidence: 99%

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First Case of Glufosinate-Resistant Rigid Ryegrass (Lolium rigidum Gaud.) in Greece

et al. 2018

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Repeated applications of the same herbicide(s), which are characterized by the same mode of action, increase selection pressure, which in turn favours the evolution of herbicide-resistant weeds. Glufosinate is a broad-spectrum non-selective herbicide being used for weed control for many years around the world. Rigid ryegrass (Lolium rigidum Gaud.) is an economically important grass weed in Greece. Recent complaints by growers about control failure of rigid ryegrass with glufosinate require further investigation and have been the basis of this study. The objectives of this study were to confirm the existence of glufosinate-resistant L. rigidum in Greece and evaluate the effect of L. rigidum growth stage on glufosinate efficacy. Twenty populations of rigid ryegrass from Greece were sampled from five regions, and whole plant dose-response studies were conducted for five populations under controlled conditions with eight rates of glufosinate (0.0, 0.098, 0.187, 0.375, 0.75, 1.5, 3.0, and 6.0 kg a.i. ha −1 ). Glufosinate resistance was confirmed in three out of five populations with the level of resistance ranging from three-to seven-fold compared with the susceptible populations based on above-ground biomass reduction. Results also revealed that the level of glufosinate-resistance of rigid ryegrass was dependent on the growth stage at which it was applied.

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Section: Dose-response Experimentssupporting

confidence: 93%

Section: Dose-response Experimentssupporting

confidence: 79%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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First Case of Glufosinate-Resistant Rigid Ryegrass (Lolium rigidum Gaud.) in Greece

et al. 2018

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“…Herbicide resistance is an evolutionary phenomenon that allows resistant weed biotypes to be exposed to the normal dose of a herbicide undergoing any suffering growth alterations (Fernández et al, 2016). This biological phenomenon is favored by intensive herbicide applications with the same active ingredient or with the same mode of action (Neve et al, 2014; Evans et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Glyphosate-Resistant Parthenium hysterophorus in the Caribbean Islands: Non Target Site Resistance and Target Site Resistance in Relation to Resistance Levels

et al. 2016

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Glyphosate has been the most intensely herbicide used worldwide for decades, and continues to be a single tool for controlling weeds in woody crops. However, the adoption of this herbicide in a wide range of culture systems has led to the emergence of resistant weeds. Glyphosate has been widely used primarily on citrus in the Caribbean area, but a study of resistance in the Caribbean islands of Cuba and the Dominican Republic has never been carried out. Unfortunately, Parthenium hysterophorus has developed glyphosate-resistance in both islands, independently. The resistance level and mechanisms of different P. hysterophorus accessions (three collected in Cuba (Cu-R) and four collected in the Dominican Republic (Do-R) have been studied under greenhouse and laboratory conditions. In in vivo assays (glyphosate dose causing 50% reduction in above-ground vegetative biomass and survival), the resistance factor levels showed susceptible accessions (Cu-S ≥ Do-S), low-resistance accessions (Cu-R3 < Do-R4), medium-resistance accessions (Do-R3 < Cu-R2 < Do-R2) and high-resistance accessions (Do-R1 < Cu-R1). In addition, the resistance factor levels were similar to those found in the shikimic acid accumulation at 1000 μM of glyphosate (Cu-R1 ≥ Do-R1 > Do-R2 > Cu-R2 > Do-R3 > Do-R4 > Cu-R3 >> Cu-S ≥ Do-S). Glyphosate was degraded to aminomethylphosphonic acid, glyoxylate and sarcosine by >88% in resistant accessions except in Cu-R3 and Do-R4 resistant accessions (51.12 and 44.21, respectively), whereas a little glyphosate (<9.32%) was degraded in both susceptible accessions at 96 h after treatment. There were significant differences between P. hysterophorus accessions in the 5-enolpyruvylshikimate-3-phosphate synthase (EPSPS) activity enzyme with and without different glyphosate rates. The R accessions showed values of between 0.026 and 0.21 μmol μg−1 TSP protein min−1 basal EPSPS activity values with respect to the S (0.024 and 0.025) accessions. The same trend was found in the EPSPS enzyme activity treated with glyphosate, where a higher enzyme activity inhibition (glyphosate μM) corresponded to greater resistance levels in P. hysterophorus accessions. One amino acid substitution was found at position 106 in EPSPS, consisting of a proline to serine change in Cu-R1, Do-R1 Do-R2. The above-mentioned results indicate that high resistance values are determined by the number of defense mechanisms (target-site and non-target-site resistance) possessed by the different P. hysterophorus accessions, concurrently.

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Mechanisms of glyphosate resistance and response to alternative herbicide‐based management in populations of the three Conyza species introduced in southern Spain

Amaro‐Blanco¹,

Fernández-Moreno

Osuna³

et al. 2018

Pest Management Science

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Forward selection for multiple resistance across the non‐selective glyphosate, glufosinate and oxyfluorfen herbicides in Lolium weed species

Abstract: A major threat to sustainability of perennial crops in the Iberian Peninsula is evident, as multiple resistance to non-selective glyphosate, glufosinate and oxyfluorfen herbicides has evolved in L. rigidum, L. perenne and L. multiflorum weeds. © 2016 Society of Chemical Industry.

Cited by 34 publications

References 19 publications

First Case of Glufosinate-Resistant Rigid Ryegrass (Lolium rigidum Gaud.) in Greece

First Case of Glufosinate-Resistant Rigid Ryegrass (Lolium rigidum Gaud.) in Greece

Glyphosate-Resistant Parthenium hysterophorus in the Caribbean Islands: Non Target Site Resistance and Target Site Resistance in Relation to Resistance Levels

Mechanisms of glyphosate resistance and response to alternative herbicide‐based management in populations of the three Conyza species introduced in southern Spain

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