Crescimento e competitividade de biótipos de capim-colchão resistente e suscetível aos herbicidas inibidores da acetil coenzima A carboxilase

Ovejero, R. F. Lopez; Novo, Maria do Carmo de Salvo Soares; Carvalho, Saul Jorge Pinto de; Nicolai, Marcelo; Christoffoleti, Pedro Jacob

doi:10.1590/s0100-204x2007000100001

Cited by 13 publications

(9 citation statements)

References 19 publications

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“…Regarding the total relative productivity, if it results in a straight line, being equal to 1, it means the competition occurs by the same environmental resources; when it is above 1 (convex), there is no competition, due to the fact that the resources supply overcome the demand or because the species have different ecological niches; and, when it is below 1 (concave), it means there is conflict, with mutual harm of the species involved (Radosevich et al, 1997). Ovejero et al (2007) confirmed that crabgrass biotypes that are susceptible and resistant to herbicides presented equivalent competitive abilities and similar ecological adaptation. However, the soybean was more competitive than both biotypes.…”

Section: Resultssupporting

confidence: 60%

Interference of Sorghum sudanense and Eleucine indica in the soybean and corn cultivation

Rizzardi

Wandscheer

2014

Planta daninha

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-The natural infestations are composed of numerous species that compete for environmental resources such as water, light, nutrients and space. The objective of this study was to evaluate the interference of mixed infestations Sorghum sudanense (sudangrass) and Eleusine indica (goosegrass) in the presence of soybean and corn. The experimental design was completely randomized with four replications and the experimental units consisted of plastic pots with a volume capacity of 8 L. The treatments were associations of plants S. sudanense and E. indica in the proportions 8:0, 6:2, 4:4,2:6 and 0:8, respectively, corresponding to 100, 75, 50, 25 and 0% S. sudanense and the reverse for E. indica. In all treatments remained constant four soybean or corn plants per experimental unit. The variables analyzed in the weeds were shoot dry weight, root, total and height of plants. The competitive analysis was accomplished through diagrams applied to replacement series experiment and indexes of competiveness. The results indicated that E. indica was more competitive than S. sudanense in mixed infestations with corn. Rather, S. sudanense was more competitive than E. indica, in mixed infestations with soybean, demonstrating differences in competitiveness among the weeds.Keywords: competition, Sorghum sudanense, Eleusine indica, competitive hability. RESUMO -O objetivo deste trabalho foi avaliar a interferência de infestações mistas de Sorghum sudanense (sudangrass) e Eleusine indica (goosegrass) na

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Section: Resultssupporting

confidence: 60%

Interference of Sorghum sudanense and Eleucine indica in the soybean and corn cultivation

Rizzardi

Wandscheer

2014

Planta daninha

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“…The competitive ability of Digitaria ciliaris biotypes that are resistant and susceptible to ACCase inhibitors is similar, and both species have the same ecological adaptability but lower competitive ability compared with soybean (Ovejero et al, 2007). There were no significant differences in the competitive ability between resistant and susceptible biotypes of Bidens subalternans Vidal;Burgos, 2011).…”

Section: Resultsmentioning

confidence: 96%

COMPETITIVE ABILITY OF WHEAT IN ASSOCIATION WITH BIOTYPES OF Raphanus raphanistrum L. RESISTANT AND SUSCEPTIBLE TO ALS-INHIBITOR HERBICIDES

Costa

Rizzardi

2015

Ciênc. agrotec.

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The occurrence of Raphanus raphanistrum ALS herbicide-resistant in wheat crops causes crop yield losses, which makes it necessary to understand the factors that influence the interference of this weed to develop safer management strategies. This study aimed to evaluate the competitive ability of wheat in coexistence with biotypes of R. raphanistrum that are resistant (R biotype) and susceptible (S biotypes) to ALS herbicides and to determine whether there are differences in the competitiveness of these biotypes. The experiments were conducted in a greenhouse using a completely randomized design with four replications. The treatments were placed in pots and arranged in replacement series for three experiments (1 -wheat with the R biotype; 2 -wheat with the S biotype; and 3 -the R biotype with the S biotype) at the following ratios: 100:0, 75:25, 50:50, 25:75, and 0:100. The competitiveness was analyzed through diagrams applied to replacement experiments and competitiveness indices, including the evaluation of the shoot dry matter of the plants (experiments 1, 2, and 3) and the leaf area (experiment 3). The R and S biotypes significantly decreased the shoot dry matter of the wheat cultivar and demonstrated superior competitive ability compared with the culture. The interspecific competition was more important for the wheat and for the S biotype. The competitiveness of the R biotype compared to the S biotype was similar, with synergism in the leaf area production, which indicates the predominant intraspecific competition exhibited by the R biotype. Index terms:Resistance; competition; replacement series. RESUMOA ocorrência de Raphanus raphanistrum resistente aos herbicidas ALS, em lavouras de trigo, ocasiona perdas de rendimento na cultura, sendo necessário conhecer os fatores que influenciam na interferência dessa planta daninha, para, assim, desenvolver estratégias de manejo com maior segurança. Objetivou-se avaliar a habilidade competitiva de trigo em convivência com biótipos de R. raphanistrum resistente (biótipo R) e suscetível (biótipo S) aos herbicidas ALS e se há diferenças de competitividade entre os biótipos. Os experimentos foram realizados em casa de vegetação, em delineamento inteiramente casualizado, com quatro repetições. Os tratamentos foram alojados em vasos e arranjados em série de substituição, em três experimentos: 1-trigo com biótipo R, 2-trigo com biótipo S e 3-biótipo R com biótipo S, nas proporções: 100:0, 75:25, 50:50, 25:75 e 0:100. A competitividade foi analisada por meio de diagramas aplicados a experimentos substitutivos e índices de competitividade, com avaliação da matéria seca da parte aérea das plantas (experimentos 1, 2 e 3) e área foliar (experimento 3). Os biótipos R e S diminuíram, significativamente, a matéria seca da parte aérea do cultivar de trigo e demonstraram habilidade competitiva superior à cultura. A competição interespecífica foi mais importante para o trigo e para o biótipo S. A competitividade do biótipo R em relação ao biótipo S foi semelhante, havendo sine...

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“…Also, for ACCase-susceptible and -resistant biotypes of Digitaria ciliaris there were no differences in plant development and biomass (López-Ovejero et al, 2007). However, for green pigweed (Amarathus powellii), the Trp 574 Leu ALS mutation caused significant pleiotropic effects on the early growth and development of the plants which, in competitive conditions, greatly reduced fitness (Tardif et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

“…Different methods of weed management should be used by farmers to avoid the evolution of herbicide resistance. However, when herbicide resistance already occurs, it is necessary to know the biology of R and S biotypes to develop an efficient alternative management strategy (López-Ovejero et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Competitiveness of ALS inhibitors resistant and susceptible biotypes of Greater Beggarticks (Bidens subalternans)

2011

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The continuous use of ALS-inhibiting herbicides has led to the evolution of herbicide-resistant weeds worldwide. Greater beggarticks is one of the most troublesome weeds found in the soybean production system in Brazil. Recently, a greater beggarticks biotype that is resistant (R) to ALS inhibitors due to Trp574Leu mutation in the ALS gene was identified. Also, the adaptive traits between susceptible (S) and R to ALS inhibitors biotypes of greater beggarticks were compared. Specifically, we aimed to: (1) evaluate and compare the relative growth rates (RGR) between the biotypes; (2) analyze the seed germination characteristics of R and S biotypes under different temperature conditions; and (3) evaluate their competitive ability in a replacement series study. The experiments were conducted at the University of Arkansas, USA, in 2007 and at Universidade Federal do Rio Grande do Sul (Federal University of Rio Grande do Sul), Brazil, in 2008. Plant proportions for replacement series studies were respectively 100:0, 75:25, 50:50, 25:75 and 0:100, with a total population of 150 plants m-2. There was no difference in RGR between R and S biotypes. The R-biotype germination rate was lower than that of the S biotype. However, at low temperature conditions (15 ºC), the reverse was observed. In general, there is no difference in the competitive ability between R and S greater beggarticks biotypes.

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Crescimento e competitividade de biótipos de capim-colchão resistente e suscetível aos herbicidas inibidores da acetil coenzima A carboxilase

Cited by 13 publications

References 19 publications

Interference of Sorghum sudanense and Eleucine indica in the soybean and corn cultivation

Interference of Sorghum sudanense and Eleucine indica in the soybean and corn cultivation

COMPETITIVE ABILITY OF WHEAT IN ASSOCIATION WITH BIOTYPES OF Raphanus raphanistrum L. RESISTANT AND SUSCEPTIBLE TO ALS-INHIBITOR HERBICIDES

Competitiveness of ALS inhibitors resistant and susceptible biotypes of Greater Beggarticks (Bidens subalternans)

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