High survival frequencies at low herbicide use rates in populations of Lolium rigidum result in rapid evolution of herbicide resistance

Neve, Paul; Powles, Stephen B.

doi:10.1038/sj.hdy.6800751

Cited by 154 publications

(151 citation statements)

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“…Além disso, o mesmo biótipo resistente normalmente apresenta níveis de resistência distintos a herbicidas de igual mecanismo de ação (Gelmini et al, 2002;Vargas et al, 2007a e b;Gazziero et al, 2006). A DL 50 de bentazon -dose necessária para efetivamente eliminar 50% das plantas de determinado biótipo (Neve & Powles, 2005) -foi inferior a 50% da dose recomendada, tanto para o biótipo resistente como para o suscetível aos inibidores da ALS (Figura 1D). No entanto, a DL 50 de pyrazosulfuron-ethyl para o biótipo S foi inferior a 25% da dose comercial, demonstrando sua elevada eficácia para esse biótipo, enquanto para o biótipo R foi necessário mais de 600% da dose comercial.…”

Section: Resultsunclassified

Resistência de Cyperus difformis a herbicidas inibidores da ALS em lavoura de arroz irrigado em Santa Catarina

Galon

Panozzo

Noldin³

et al. 2008

Planta daninha

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RESUMO -A resistência de plantas daninhas a herbicidas tornou-se preocupação mundial nas últimas décadas. Esse fenômeno caracteriza-se pela capacidade de um biótipo de sobreviver a um tratamento com herbicida que controla os demais indivíduos da mesma população em condições normais de campo e na dose recomendada pelo fabricante na bula. Objetivou-se com este trabalho determinar o nível de resistência de biótipos de Cyperus difformis a herbicidas inibidores da enzima ALS e do fotossistema II. Os tratamentos foram constituídos pelos herbicidas bispyribac-sodium e pyrazosulfuron-ethyl (inibidores da ALS) e bentazon (inibidor do fotossistema II), aplicados em sete doses múltiplas da dose comercial (0,0x, 0,5x, 1x, 2x, 4x, 8x e 16x), sobre duas populações de plantas de C. difformis, quando estas apresentavam de quatro a seis folhas. O biótipo de C. difformis (CYPDI-10) apresentou resistência cruzada aos inibidores da ALS pyrazosulfuron-ethyl e bispyribac-sodium, enquanto o bentazon proporcionou controle eficiente das populações resistente e suscetível. Conclui-se que para manejo das populações de C. difformis resistentes aos inibidores da ALS, em áreas de arroz irrigado de Santa Catarina, devem-se utilizar herbicidas com diferentes mecanismos de ação, associado a outras práticas de manejo, para restringir a expansão das populações resistentes de C. difformis.Palavras-chave: resistência cruzada, pyrazosulfuron-ethyl, bispyribac-sodium, junquinho.ABSTRACT -Herbicide resistance is a worldwide phenomenon of great concern to scientists, technicians and producers. It is characterized as the capacity of a biotype to survive a treatment using herbicide that controls the other individuals of the same population under normal field conditions and at the dose recommended by the manufacturer. The objective of this research was to determine the resistance level of two Cyperus difformis biotypes to ALS-inhibiting herbicides. The herbicide treatments consisted of the application of bispyribac-sodium, pyrazosulfuron-ethyl, (ALS-inhibitors) and bentazon (photosystem II inhibitor) sprayed at seven multiple commercial doses (0,0x; 0.5x; 1x; 2x; 4x; 8x and 16x), on two plant populations of C. difformis, at the stage of four to six leaves. The CYPDI-10 biotype showed a crossed-resistance to the ALS-inhibiting herbicides pyrazosulfuron-ethyl and bispyribac-sodium, while bentazon showed an efficient control of the resistant and susceptible populations. It was concluded that for the correct management of ALSresistant C. difformis biotypes in flooded rice areas of Santa Catarina, Brazil, the use of herbicides with different action mechanisms should be adopted, as well as other management practices in order to restrict the expansion of resistant populations of C. difformis.

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Section: Resultsunclassified

Resistência de Cyperus difformis a herbicidas inibidores da ALS em lavoura de arroz irrigado em Santa Catarina

Galon

Panozzo

Noldin³

et al. 2008

Planta daninha

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“…However, it is argued that resistance alleles will have pleiotropic fitness costs when the stress factor is removed from the environment-the so-called 'cost of resistance'. Pleiotropic costs of resistance may pose limits on evolution by natural selection and their likely existence is based on observed polymorphism at alleles for pathogen, herbivore and herbicide resistance in natural and agricultural systems (Fritz and Simms, 1992;Preston and Powles, 2002;Neve and Powles, 2005).…”

Section: Introductionmentioning

confidence: 99%

A unified approach to the estimation and interpretation of resistance costs in plants

2011

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International audiencePlants exhibit a number of adaptive defence traits that endow resistance to past and current abiotic and biotic stresses. It is generally accepted that these adaptations will incur a cost when plants are not challenged by the stress to which they have become adapted--the so-called 'cost of adaptation'. The need to minimise or account for allelic variation at other fitness-related loci (genetic background control) is frequently overlooked when assessing resistance costs associated with plant defence traits. We provide a synthesis of the various experimental protocols that accomplish this essential requirement. We also differentiate those methods that enable the identification of the trait-specific or mechanistic basis of costs (direct methods) from those that provide an estimate of the impact of costs by examining the evolutionary trajectories of resistance allele frequencies at the population level (indirect methods). The advantages and disadvantages for each proposed experimental design are discussed. We conclude that plant resistance systems provide an ideal model to address fundamental questions about the cost of adaptation to stress. We also propose some ways to expand the scope of future studies for further fundamental and applied insight into the significance of adaptation costs

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“…The selection and subsequent enrichment of gene traits progressively led to polygenic resistance to diclofopmethyl and concomitant low-level cross-resistance to some other herbicide modes of action. In a separate study, even a single cycle of selection with diclofopmethyl moved susceptible L. rigidum populations (five) toward resistance (Neve and Powles, 2005a). Notwithstanding these results, there is still an ongoing discussion on the effect and relevance of sublethal herbicide doses leading to polygenic herbicide resistance evolution by the accumulation of several minor genes (genes of small effect) vis-à-vis resistance due to a single major gene with a large phenotypic effect (typically a discrete Mendelian gene).…”

Section: Introductionmentioning

confidence: 99%

Evolution of glyphosate resistance in a Lolium rigidum population by glyphosate selection at sublethal doses

2009

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The majority of the documented cases of field-evolved herbicide-resistant weed biotypes established that single major genes confer glyphosate resistance. However, the contribution of minor genes endowing substantial plant survival at sublethal herbicide doses may be a potential complementary path to herbicide resistance evolution in weed populations under selection. Here, we subjected a number of susceptible individuals of Lolium rigidum to recurrent glyphosate selection to test the potential for sublethal glyphosate doses to additively select for glyphosate resistance. After 3-4 cycles of glyphosate selection in two distinct environments, the progenies of the initially susceptible population were shifted toward glyphosate resistance. The results indicate progressive enrichment of minor gene trait(s) contributing toward plant survival in the glyphosate-selected progenies. After three generations of selection, the estimated LD 50 values were doubled compared with the original population and up to 33% plant survival was obtained in the glyphosate-selected progeny at the recommended glyphosate label rate. This level of resistance probably was the maximum shift achievable with sublethal glyphosate dose selection in this small population. Cross-pollination was a crucial factor enabling the rapid rate of accumulation of minor glyphosate resistance gene trait(s) that are likely to be present at a relatively high frequency in a small susceptible population. The mechanistic basis of the moderate glyphosate resistance level selected by sublethal glyphosate doses remains unknown and warrants future research. Studying the main factors influencing the evolution of resistant weed populations is crucial for understanding, predicting and managing herbicide resistance.

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High survival frequencies at low herbicide use rates in populations of Lolium rigidum result in rapid evolution of herbicide resistance

Cited by 154 publications

References 28 publications

Resistência de Cyperus difformis a herbicidas inibidores da ALS em lavoura de arroz irrigado em Santa Catarina

Resistência de Cyperus difformis a herbicidas inibidores da ALS em lavoura de arroz irrigado em Santa Catarina

A unified approach to the estimation and interpretation of resistance costs in plants

Evolution of glyphosate resistance in a Lolium rigidum population by glyphosate selection at sublethal doses

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