Degradation and Metabolism of Fenoxaprop and Mesosulfuron + Iodosulfuron in Multiple Resistant Blackgrass (Alopecurus myosuroides)

Kaiser, Yasmin I.; Gerhards, Roland

doi:10.1007/s10343-015-0343-3

Cited by 8 publications

(15 citation statements)

References 24 publications

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“…However, these differences do not invalidate our claim that enhanced metabolism plays a major role in resistance to the three ACCase inhibitors in the MHR line. Differences in metabolism rates of a few fold resulting in variable resistance indices in whole plants have been observed in other well‐characterized cases of metabolism‐based resistant weeds (Christopher et al ., ; Ma et al ., ; Yu et al ., ; Kaiser & Gerhards, ). Meanwhile, our study does not exclude the possible involvement of other mechanisms, although most of the mechanisms proposed for weed resistance to ACCase inhibitors, such as insensitivity or overproduction of target site (Kaundun, ; Laforest et al ., ) and reduced absorption of herbicide (De Prado et al ., ), have been dismissed.…”

Section: Discussionmentioning

confidence: 99%

CYP81A P450s are involved in concomitant cross‐resistance to acetolactate synthase and acetyl‐CoA carboxylase herbicides in Echinochloa phyllopogon

et al. 2018

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Summary Californian populations of Echinochloa phyllopogon have evolved multiple‐herbicide resistance (MHR), posing a threat to rice production in California. Previously, we identified two CYP81A cytochrome P450 genes whose overexpression is associated with resistance to acetolactate synthase (ALS) inhibitors from two chemical groups. Resistance mechanisms to other herbicides remain unknown. We analyzed the sensitivity of an MHR line to acetyl‐CoA carboxylase (ACCase) inhibitors from three chemical groups, followed by an analysis of herbicide metabolism and segregation of resistance of the progenies in sensitive (S) and MHR lines. ACCase herbicide metabolizing function was investigated in the two previously identified P450s. MHR plants exhibited resistance to all the ACCase inhibitors by enhanced herbicide metabolism. Resistance to the ACCase inhibitors segregated in a 3 : 1 ratio in the F2 generation and completely co‐segregated with ALS inhibitor resistance in F6 lines. Expression of the respective P450 genes conferred resistance to the three herbicides in rice, which is in line with the detection of hydroxylated herbicide metabolites in vivo in transformed yeast. CYP81As are super P450s that metabolize multiple herbicides from five chemical classes, and concurrent overexpression of the P450s induces metabolism‐based resistance to the three ACCase inhibitors in MHR E. phyllopogon, as it does to ALS inhibitors.

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Section: Discussionmentioning

confidence: 99%

CYP81A P450s are involved in concomitant cross‐resistance to acetolactate synthase and acetyl‐CoA carboxylase herbicides in Echinochloa phyllopogon

et al. 2018

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“…Enhanced herbicide metabolism assumed to be the mechanism endowing NTSR in the studied population ID914, as it is common in black-grass populations ( Hall et al, 1995 ; Cummins et al, 1999 ; Preston, 2004 ; Délye, 2005 ) and was also expected in 75% of ACCase (i.e., fenoxaprop- P -ethyl and clodinafop-propargyl)-resistant black-grass populations in France ( Délye et al, 2007 ). Recently, it was also demonstrated that enhanced metabolism plays an important role in developing resistant black-grass populations ( Kaiser and Gerhards, 2015 ). Also, other NTSR mechanisms including reduced penetration and translocation have not been reported in black-grass ( Hall et al, 1995 ; Menendez and De Prado, 1996 ).…”

Section: Methodsmentioning

confidence: 99%

No Vegetative and Fecundity Fitness Cost Associated with Acetyl-Coenzyme A Carboxylase Non-target-site Resistance in a Black-Grass (Alopecurus myosuroides Huds) Population

2017

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Attention should be devoted to weeds evolving herbicide resistance with non-target-site resistance (NTSR) mechanism due to their unpredictable resistance patterns. Quantification of fitness cost can be used in NTSR management strategies to determine the long-term fate of resistant plants in weed populations. To our knowledge, this is the first report evaluating potential fecundity and vegetative fitness of a NTSR black-grass (Alopecurus myosuroides Huds), the most important herbicide resistant weed in Europe, with controlled genetic background. The susceptible (S) and NTSR sub-populations were identified and isolated from a fenoxaprop-P-ethyl resistant population by a plant cloning technique. Using a target-neighborhood design, competitive responses of S and NTSR black-grass sub-populations to increasing density of winter wheat were quantified for 2 years in greenhouse and 1 year in field. Fitness traits including potential seed production, vegetative biomass and tiller number of both sub-populations significantly decreased with increasing density of winter wheat. More importantly, no statistically significant differences were found in fitness traits between S and NTSR sub-populations either grown alone (no competition) or in competition with winter wheat. According to the results, the NTSR black-grass is probably to persist in field even in the cessation of fenoxaprop-P-ethyl. So, effective herbicide resistant management strategies are strongly suggested to prevent and stop the spread of the NTSR black-grass, otherwise NTSR loci conferring resistance to a range of herbicides in black-grass will persist in the gene pool even in the absence of herbicide application. Consequently, herbicide as an effective tool for control of black-grass will gradually be lost in fields infested by NTSR black-grass.

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“…It might be the case that ComCat ® induced the activity of certain enzymes in barley, which are involved in herbicide metabolism. The higher activity of herbicide metabolizing enzymes such as glutathione-S-transferase and P450-monoxygenase has often been described as the reason for herbicide selectivity and herbicide resistance in tolerant plants [19]. The mode of action of ComCat ® in plant defense mechanisms has not been explored.…”

Section: Discussionmentioning

confidence: 99%

Crop Response to Leaf and Seed Applications of the Biostimulant ComCat® under Stress Conditions

Gerhards

Ouidoh²,

Adjogboto³

et al. 2021

Agronomy

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Although clear evidence for benefits in crop production is partly missing, several natural compounds and microorganisms have been introduced to the market as biostimulants. They are supposed to enhance nutrient efficiency and availability in the rhizosphere, reduce abiotic stress, and improve crop quality parameters. Biostimulants often derive from natural compounds, such as microorganisms, algae, and plant extracts. In this study, the commercial plant extract-based biostimulant ComCat® was tested in two field experiments with maize in the communities of Banikoara and Matéri in Northern Benin and six pot experiments (four with maize and two with winter barley) at the University of Hohenheim in Germany. Maize was grown under nutrient deficiency, drought, and weed competition, and winter barley was stressed by the herbicide Luximo (cinmethylin). ComCat® was applied at half, full, and double the recommended field rate (50, 100, and 200 g ha−1) on the stressed and unstressed control plants as leaf or seed treatment. The experiments were conducted in randomized complete block designs with four replications. The above-ground biomass and yield data of one experiment in Benin were collected. The biostimulant did not promote maize and winter barley biomass production of the unstressed plants. When exposed to stress, ComCat@ resulted only in one out of eight experiments in higher barley biomass compared to the stressed treatment without ComCat® application. There was a reduced phytotoxic effect of cinmethylin after seed treatment with ComCat®. Crop response to ComCat® was independent of the application rate. Basic and applied studies are needed to investigate the response of crops to biostimulants and their mechanisms of action in the plants before they should be used in practical farming.

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Degradation and Metabolism of Fenoxaprop and Mesosulfuron + Iodosulfuron in Multiple Resistant Blackgrass (Alopecurus myosuroides)

Cited by 8 publications

References 24 publications

CYP81A P450s are involved in concomitant cross‐resistance to acetolactate synthase and acetyl‐CoA carboxylase herbicides in Echinochloa phyllopogon

CYP81A P450s are involved in concomitant cross‐resistance to acetolactate synthase and acetyl‐CoA carboxylase herbicides in Echinochloa phyllopogon

No Vegetative and Fecundity Fitness Cost Associated with Acetyl-Coenzyme A Carboxylase Non-target-site Resistance in a Black-Grass (Alopecurus myosuroides Huds) Population

Crop Response to Leaf and Seed Applications of the Biostimulant ComCat® under Stress Conditions

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