Responses to clomazone and 5‐ketoclomazone by <i>Echinochloa phyllopogon</i> resistant to multiple herbicides in Californian rice fields

Yasuor, Hagai; TenBrook, Patti L.; Tjeerdema, Ronald S.; Fischer, Albert J.

doi:10.1002/ps.1604

Cited by 60 publications

(73 citation statements)

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“…Ratios of the GR 50 (herbicide dose to inhibit growth by 50%) values of resistant to susceptible E. phyllopogon plants of approximately 2 indicated low levels of clomazone resistance (Yasuor et al, 2008). This resistance was not caused by differential uptake, translocation, or bioactivation of inactive clomazone to active 5-ketoclomazone (Yasuor et al, 2008). Based on inhibitor data, Fischer et al (2000b) suggested that herbicide degradation mediated by cytochrome P450 monooxygenases (EC 1.14.14.1 [P450]) was a mechanism conferring E. phyllopogon resistance to multiple herbicides.…”

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confidence: 99%

“…These include the lipid synthesis inhibitors molinate and thiobencarb; the acetyl-CoA carboxylase inhibitors fenoxapropethyl and cyhalofop; the acetolactate synthase inhibitors bispyribac-sodium, bensulfuron-methyl, and penoxsulam; and the DXP synthase inhibitor clomazone (Fischer et al, 2000a;Yasuor et al, 2008Yasuor et al, , 2009). Ratios of the GR 50 (herbicide dose to inhibit growth by 50%) values of resistant to susceptible E. phyllopogon plants of approximately 2 indicated low levels of clomazone resistance (Yasuor et al, 2008). This resistance was not caused by differential uptake, translocation, or bioactivation of inactive clomazone to active 5-ketoclomazone (Yasuor et al, 2008).…”

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Differential Oxidative Metabolism and 5-Ketoclomazone Accumulation Are Involved in Echinochloa phyllopogon Resistance to Clomazone

et al. 2010

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Echinochloa phyllopogon (late watergrass) is a major weed of California rice (Oryza sativa) that has evolved cytochrome P450-mediated metabolic resistance to different herbicides with multiple modes of action. E. phyllopogon populations from Sacramento Valley rice fields have also recently shown resistance to the herbicide clomazone. Clomazone is a proherbicide that must be metabolized to 5-ketoclomazone, which is the active compound that inhibits deoxyxylulose 5-phosphate synthase, a key enzyme of the nonmevalonate isoprenoid pathway. This study evaluated the differential clomazone metabolism within strains of the same species to investigate whether enhanced oxidative metabolism also confers clomazone resistance in E. phyllopogon. Using reverse-phase liquid chromatography-tandem mass spectrometry techniques in the multireaction monitoring mode, we elucidated that oxidative biotransformations are involved as a mechanism of clomazone resistance in this species. E. phyllopogon plants hydroxylated mostly the isoxazolidinone ring of clomazone, and clomazone hydroxylation activity was greater in resistant than in susceptible plants. The major clomazone metabolites resulted from monohydroxylation and dihydroxylation of the isoxazolidinone ring. Resistant plants accumulated 6-to 12-fold more of the monohydroxylated metabolite than susceptible plants, while susceptible plants accumulated 2.5-fold more of the phytotoxic metabolite of clomazone, 5-ketoclomazone. Our results demonstrate that oxidative metabolism endows multiple-herbicide-resistant E. phyllopogon with cross-resistance to clomazone through enhanced herbicide degradation and lower accumulation of the toxic metabolite in resistant versus susceptible plants.

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Differential Oxidative Metabolism and 5-Ketoclomazone Accumulation Are Involved in Echinochloa phyllopogon Resistance to Clomazone

et al. 2010

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“…Further complicating the situation in rice, populations of late watergrass and barnyardgrass (Echinochloa crus-galli) with resistance to both ACCase inhibitors and thiocarbamates, and thus exhibiting multiple resistance, were reported in 2000. Later research confirmed that the mechanisms of multiple resistance to several herbicide classes are due to metabolic degradation of these compounds (Yasuor et al 2008(Yasuor et al , 2009.…”

Section: Herbicide Resistance In Californiamentioning

confidence: 93%

Herbicide-resistant weeds challenge some signature cropping systems

Hanson¹,

Wright²,

Sosnoskie³

et al. 2014

Cal Ag

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Invasive and endemic weeds pose recurring challenges for California land managers. The evolution of herbicide resistance in several species has imposed new challenges in some cropping systems, and these issues are being addressed by UC Cooperative Extension farm advisors, specialists and faculty. There are currently 24 unique herbicide-resistant weed biotypes in the state, dominated by grasses and sedges in flooded rice systems and, more recently, glyphosate-resistant broadleaf and grass weeds in tree and vine systems, roadsides and glyphosate-tolerant field crops. Weed scientists address these complex issues using approaches ranging from basic physiology and genetics research to applied research and extension efforts in grower fields throughout the state. Although solutions to herbicide resistance are not simple and are affected by many biological, economic, regulatory and social factors, California stakeholders need information, training and solutions to address new weed management problems as they arise. Coordinated efforts conducted under the Endemic and Invasive Pests and Disease Strategic Initiative directly address weed management challenges in California's agricultural industries. E ndemic and invasive weeds are important management concerns in California due to their direct and indirect costs to agriculture, the environment and society. Pimentel et al. (2005) estimated that weeds cost U.S. crop producers and pasture managers over $30 billion in control-related expenses and reduced productivity. Although specific data are not available for California's portion of these losses, weed management costs for the state's 40 million acres of crop and grazing lands, as well as the remaining 60 million acres of land area, amount, undoubtedly, to several billion dollars annually. In addition to the direct cost of weed control and lost agricultural productivity, weeds also affect ecosystem quality and function, reduce recreational access and degrade aesthetics in natural areas, change wildland fire regimes and severity, and impede water flow through rivers and canals, among other negative impacts.Although crop weeds are seldom considered as being "invasive" in the traditional sense, novel biotypes can develop, spread and subsequently occupy a greater proportion of crop acreage than might normally be expected. For example, when a weed population evolves resistance to an herbicide or any other control measure, a "routine" pest can become a new and serious problem. The first case of an herbicide-resistant weed in California was reported in 1981 by UC scientists (Holt et al. 1981); in recent years, additional species have evolved resistance to various herbicide chemistries ( A stone fruit orchard in Fresno County is dominated by glyphosate-resistant horseweed. Reliance on one method of weed control imposes selection pressure, which can lead to population shifts to tolerant species or selection of resistant biotypes. Anil ShresthaO nce pests and diseases become established, their interactions with crops, landscapes or an...

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“…米国カリフォルニア州で発見された除草剤抵抗性タイヌビエ（Echinochloa phyllopogon = E. oryzicola）は，異なる作用機構の除草剤に抵抗性を示す多剤抵抗性型であることが知られていた（Fischer et al 2000;Osuna et al 2002;Ruiz-Santaella et al 2006;Bakkali et al 2007;Yasuor et al 2008Yasuor et al , 2009 …”

Section: ．タイヌビエの非作用点抵抗性unclassified

Study on the molecular mechanism of non-target-site resistance in several paddy weeds

Iwakami

2015

J. Weed Sci. Tech

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Responses to clomazone and 5‐ketoclomazone by Echinochloa phyllopogon resistant to multiple herbicides in Californian rice fields

Cited by 60 publications

References 34 publications

Differential Oxidative Metabolism and 5-Ketoclomazone Accumulation Are Involved in Echinochloa phyllopogon Resistance to Clomazone

Differential Oxidative Metabolism and 5-Ketoclomazone Accumulation Are Involved in Echinochloa phyllopogon Resistance to Clomazone

Herbicide-resistant weeds challenge some signature cropping systems

Study on the molecular mechanism of non-target-site resistance in several paddy weeds

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