Adaptive value of ryegrass biotypes with low-level resistance and susceptible to the herbicide fluazifop and competitive ability with the wheat culture

Fraga, D.S.; Agostinetto, Dirceu; Várgas, Leandro; Nohatto,; Thürmer, L.; Holz, Marcelo Timm

doi:10.1590/s0100-83582013000400014

Cited by 8 publications

(9 citation statements)

References 20 publications

(23 reference statements)

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“…(Lamego et al, 2011), Cyperus difformis L. (Dal Magro, 2011), B. pilosa (Christoffoleti, 2001) e Raphanus raphanistrum L. (Li et al, 2013). Em biótipos de azevém suscetível e com resistência de nível baixo ao fluazifop, também foi verificado valor adaptativo similar entre biótipos (Fraga et al, 2013). Para biótipos de Fimbristylis miliacea (L.) Vahl resistente e suscetível a inibidores da enzima ALS, houve diferenças quanto aos seus valores adaptativos no início do florescimento; contudo, não foram relatadas diferenças em estádios iniciais de desenvolvimento (Schaedler et al, 2013).…”

Section: Resultsunclassified

“…Entretanto, não foram observadas grandes diferenças no valor adaptativo entre biótipos para explicar esse resultado. Em estudo em que o trigo competiu com azevém suscetível e com resistência de nível baixo ao herbicida fluazifop, também verificou-se que a habilidade competitiva do trigo foi superior à do biótipo com resistência de nível baixo mas equivalente à do biótipo suscetível (Fraga et al, 2013).…”

Section: Resultsunclassified

“…Contudo, em 50% das comparações, não foram observadas diferenças significativas. Fraga et al (2013), ao avaliar azevém em competição com trigo, encontraram resultados semelhantes, em que a cultura preferiu dividir o nicho com outra espécie a competir com plantas da mesma espécie.…”

Section: Resultsunclassified

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Valor adaptativo e habilidade competitiva de azevém resistente e suscetível ao iodosulfuron em competição com o trigo

Mariani

Várgas

Agostinetto

et al. 2016

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi identificar e comparar valores adaptativos dos biótipos de azevém (Lolium multiflorum) resistente e suscetível ao herbicida iodosulfuron e avaliar sua habilidade competitiva com o trigo (Triticum aestivum). Para avaliar o valor adaptativo, os biótipos foram semeados em vasos e coletados a cada 10 dias após a emergência, até os 80 dias. Em cada coleta, avaliaram-se estatura, área foliar e massa seca da parte aérea, e, a partir destas avaliações, foram calculadas variáveis indiretas para comparar o crescimento entre os biótipos. A habilidade competitiva foi determinada em experimento de série de substituição, tendo-se variado a proporção da cultura e do competidor. As proporções testadas foram: 100:0 (estande puro do trigo), 75:25, 50:50, 25:75 e 0:100% (estande puro do biótipo de azevém resistente ou suscetível); já as variáveis avaliadas foram área foliar e massa seca. Os resultados dos estudos comparativos de crescimento mostraram similaridade entre os biótipos de azevém resistente e suscetível ao iodosulfuron, o que não caracterizou efeito pleiotrópico decorrente da resistência. Quanto à habilidade competitiva, a competição interespecífica é prejudicial para o biótipo resistente, enquanto, para o biótipo suscetível, independe o competidor. A cultura do trigo mostra habilidade competitiva superior a dos biótipos de azevém resistente e suscetível.Termos para indexação: Lolium multiflorum, Triticum aestivum, competição interespecífica, herbicida, planta daninha.Adaptive value and competitive ability of ryegrass resistant and susceptible to iodosulfuron in competition with wheat Abstract -The objective of this work was to identify and compare adaptive values of ryegrass (Lolium multiflorum) biotypes resistant and susceptible to the herbicide iodosulfuron and to evaluate their competitive ability with wheat (Triticum aestivum). To evaluate the adaptive value, the biotypes were sown in pots and collected every 10 days after emergence, up to 80 days. At each collection, height, leaf area, and dry matter of shoots were assessed, and, from these evaluations, indirect variables were calculated to compare the growth between the biotypes. The competitive ability was determined in a replacement series experiment, varying the proportion of the culture and of the competitor. The proportions tested were: 100:0 (wheat in pure stand), 75:25, 50:50, 25:75, and 0:100% (resistant or susceptible ryegrass biotype under pure stand); the evaluated variables were leaf area and dry matter. The results of the comparative studies of growth showed similarity between ryegrass biotypes resistant and susceptible to iodosulfuron, which does not characterize pleitropic effect due to resistance. Regarding competitive ability, interspecific competition is harmful to the resistant biotype, whereas, for the susceptible biotype, there is no effect of the competitor. The wheat crop shows greater competitive ability than resistant and susceptible ryegrass biotypes.Index terms: Lolium multiflorum, Triticum aestivu...

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Section: Resultsunclassified

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Valor adaptativo e habilidade competitiva de azevém resistente e suscetível ao iodosulfuron em competição com o trigo

Mariani

Várgas

Agostinetto

et al. 2016

Pesq. agropec. bras.

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“…LAI presented a behavior similar to that of LA since the growth of both genotypes occurred in a limited area free of competition and under the same availability of resources ( Figure 3B). LA and LAI values are directly related to light interception and photosynthetic capacity, once plants with higher LAI and LA are more efficient in fixing CO 2 , with advantages when submitted to the competition (Fraga et al, 2012). Thus, tetraploid ryegrass may have less impaired growth when in competition.…”

Section: Fitness Costmentioning

confidence: 99%

Fitness Cost and Competitive Ability to Different Ploidy Levels in Ryegrass Genotypes

et al. 2019

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The intergenotypic competition of tetraploid ryegrass with natural diploid population may be a tool to reduce the frequency of resistant individuals in an area. This study aimed to identify and compare the phenological development, fitness cost, and competitive ability between diploid and tetraploid ryegrass genotypes. Genotypes were grown in pots, and the morphological variables of genotype growth were assessed every 15 days up to 120 days after emergence to evaluate the fitness cost. Phenological development and seed yield components were measured in a single time together with the fitness cost. Competitive ability was determined in a replacement-series experiment with proportions of tetraploid and diploid ryegrass, in which the number of tillers, plant height, leaf area, and shoot dry weight were assessed at 50 days after emergence. The results of fitness cost showed that the number of tillers, leaf area, root dry weight, and the number of seeds were higher for tetraploid ryegrass, which presented a higher competitive ability than the diploid genotype regardless of the tested proportions. Tetraploid ryegrass may be useful for reducing the frequency of herbicide-resistant diploid ryegrass because of its higher competitive potential.

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“…Failure was observed in areas treated with herbicides aryloxyphenoxypropionates and cyclohexanediones on isolated plants (Fraga et al, 2013). Case analysis did not reveal any plausible explanation for the failure, since the application factors such as the herbicide dose, vegetative stage, environmental conditions, and equipment aids used were suitable.…”

Section: Introductionmentioning

confidence: 96%

Resistance characterization of Italian ryegrass (Lolium multiflorum) biotypes to clethodim herbicide

Schneider¹,

Várgas²,

Agostinetto³

et al. 2016

Afr. J. Agric. Res.

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The objective of this study is to determine the dose required to control 50% population (C 50 ) and to reduce 50% dry matter production (GR 50 ) of resistant biotypes of ryegrass in comparison to that of a susceptible biotype as well as to evaluate the mechanism of resistance by cyt-P450 inhibitor application. The study was conducted in a greenhouse in Rio Grande do Sul, Brazil on plants that survived clethodim herbicide application, which were suspected of possessing resistance. For plants surviving field application, the biotypes were 50% controlled with herbicide dose of 28.4-and 29.5-times greater compared to that of susceptible biotypes; 50% of dry matter reduction occurred with doses of 540-and 574-times greater than the susceptibility dose of a biotype, since the dose required to reduce 50% of susceptible biotype was 0.2 g a.i. ha -1 . The biotypes showed metabolism of clethodim herbicide as regards the inhibition by piperonyl butoxide, indicating that metabolism is the probable cause of control failures in the field.

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Adaptive value of ryegrass biotypes with low-level resistance and susceptible to the herbicide fluazifop and competitive ability with the wheat culture

Cited by 8 publications

References 20 publications

Valor adaptativo e habilidade competitiva de azevém resistente e suscetível ao iodosulfuron em competição com o trigo

Valor adaptativo e habilidade competitiva de azevém resistente e suscetível ao iodosulfuron em competição com o trigo

Fitness Cost and Competitive Ability to Different Ploidy Levels in Ryegrass Genotypes

Resistance characterization of Italian ryegrass (Lolium multiflorum) biotypes to clethodim herbicide

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