Respostas de plantas de Eleusine indica sob diferentes condições hídricas a herbicidas inibidores da ACCase

Pereira, María Renata Rocha; Souza, Gustavo Soares de; Martins, D.; Filho, André Luiz Melhorança; Klar, Antônio Evaldo

doi:10.1590/s0100-83582011000200017

Cited by 10 publications

(7 citation statements)

References 8 publications

(10 reference statements)

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“…Plants without water stress transpire more due to increased stomatal opening, which is inversely proportional to leaf temperature; with increased perspiration, the leaf temperatures decrease. Coinciding with these results, Pereira et al (2011) described that the rate of photosynthesis, transpiration and stomatal conductance were higher in Eleusine indica plants kept without water stress (only with the potential of -0.03 MPa), which presented the lowest leaf temperatures compared to the environment and, consequently, presented higher dry matter and higher values of phytotoxicity with the application of the herbicide sethoxydim.…”

Section: Resultssupporting

confidence: 59%

“…According to Deuba (1992), the amount of herbicide that penetrates the leaf cuticle of weeds is affected by conditions such as soil moisture, herbicide characteristics and developmental state of the weed. Corroborating these data, Pereira et al (2011) found that the control effectiveness of Eleusine indica using the herbicide sethoxydim was lower in plants grown under water deficit conditions.…”

Section: Introductionmentioning

confidence: 81%

“…There are few research studies in the international literature that address this topic; for example, the extant studies are based on other weed species (Pereira, 2010 and2011).…”

Section: Introductionmentioning

confidence: 99%

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Effect of water stress on herbicide efficiency applied to Urochloa decumbens

et al. 2012

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The experimental design was a completely randomized design with four replications, consisting of a 9 x 4 factorial, combined with three water management systems (-0.03, -0.07 and -1.5 MPa) and three herbicides (fluazifop-p-butyl, haloxyfop-methyl and sethoxydim + oil using four doses (100, 50, 25 and 0% of the recommended dose). Herbicide applications were conducted at two vegetative stages for all species: a 4-6 leaf stage and a 2-3 tiller stage. The physiological parameters evaluated were as follows: photosynthetic rate, stomatal conductance, transpiration, leaf temperature and plant dry matter. The visual assessments of phytotoxicity were performed 28 days after herbicide application. The control efficiency was lower in plants grown under soil water potential conditions of -1.5 MPa, regardless of the herbicide used during the two application stages; however, none reached 100% control. Fractionation of the recommended herbicide doses reduced effectiveness, with the exception of the 50%-dose application of sethoxydim and fluazifop-p-butyl herbicides, which were also effective in the 4-6 leaf plant control under normal water conditions.

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Section: Resultssupporting

confidence: 59%

Section: Introductionmentioning

confidence: 81%

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Effect of water stress on herbicide efficiency applied to Urochloa decumbens

et al. 2012

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“…The ACCase present in poaceae is sensitive to inhibition by these herbicides (Rodrigues, 1994). However, some conditions are recommended so that the herbicides can reach a higher efficiency, such as the application when the plants present an elevated metabolic activity (Pereira et al, 2011).…”

Section: Resultsmentioning

confidence: 99%

Geographic Distribution of Ryegrass Resistent to the Clethodim Herbicide in Rio Grande do Sul1

et al. 2016

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-Ryegrass is a weed of annual cycle that is present in winter crops, in orchards and vineyards of the South region of Brazil. The species is normally controlled by the glyphosate herbicide, but the continuous use of this product caused the selection of resistant biotypes. The use of ACCase inhibitor herbicides is the main alternative for the control of this species, but it has not been satisfactory in some places, thus causing suspicion of resistance to this action mechanism. Thus, the objective of this paper was to evaluate the occurrence and geographic distribution of ryegrass biotypes that are resistant to the clethodim herbicide in the state of Rio Grande do Sul. For that, seeds of ryegrass plants that survived the application of clethodim were collected in crops from the north region of RS, summing up to a total of 152 samples from 72 cities. The biotypes were submitted to the application of 120 g i.a. ha -1 (maximum registered dose) and 60 g i.a. ha -1 de clethodim (half the maximum registered dose). According to the results, among the samples of ryegrass seeds collected, there were no biotypes resistant to the clethodim herbicide when the maximum registered dose was applied and in the stage of three to four leaves. However, there were biotypes with lower susceptibility that survived half the maximum registered dose.

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“…Increases environmental stress on crops may make them more vulnerable to attack by insects and plant pathogens and less competitive with weeds (Patterson, 1995). Pereira et al, (2011) found that the efficacy of sethoxydim was lower in goosegrass (E. indica) plants grown under water-deficit conditions. Similarly, plantain signalgrass (Urochloa plantaginea) plants grown under water stress were not effectively controlled by ACCase-inhibiting herbicides when applied during the later growth stages (Pereira, 2010).…”

Section: Effect Of Precipitationmentioning

confidence: 99%

Climate Change’s Impacts on Weeds and Herbicide Efficacy: A Review

Kumar¹,

Kumar²

2017

Int.J.Curr.Microbiol.App.Sci

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Climate change is a natural and continuous process. But recent relatively rapid change in climate occurs due to anthropogenic activities which makes alarming attention because it contributes largely to global warming by affecting the greenhouse gases (GHGs) and aerosols. GHGs mainly CO 2 , methane, nitrous oxide CFC11, CFC12, HCFC22and HFC23 with different global warming potential accumulate in atmosphere and increase in concentration over time creating the so called "greenhouse effect". This effect can alters balance by transmitting incoming solar radiation but absorbing outgoing thermal radiation from surface. Atmospheric CO 2 rose from 280 to 387 μmolmol -1 from 1750 to 2007 and expected to reach 600 μmolmol -1 by 2050 and global earth surface temperature is likely to rise in a range of 1.1 to 6.4°C during the 21st century due to the rising CO 2 concentration. Weeds are complex in nature and have significant negative effect on agriculture. Chemical weed control becomes major choice/tool because of its economic, easy to use, greater efficacy, due to scarcity of labour and time saving. Climate component viz., light, CO 2 , temperature, precipitation, humidity, wind, environmental stress etc. affect crop-weed competition and efficacy of applied herbicides. Light stimulates weed seed development and leaf shape. Light is the source of energy for photosynthesis and the rate of photosynthesis determines the rate of phloem translocation of assimilates and subsequent phloem translocation will increase the movement of foliar-applied systemic herbicides. Most crops are C 3 and most weeds are C 4 , and hence weed competition will consequently decrease as CO 2 increases, should not be viewed as universal axiom as there are four major C 4 crops of economic importance (corn, pearlmillet, sorghum, and sugarcane), and their many important C 3 weeds. Increasing CO 2 concentration increases the starch concentration in tissue and reduces the protein content leads to less demand of amino acids synthesis which alters the efficacy of ALS inhibitors herbicides. High temperature shortens the growth phases, stimulate stomata conductance and lowers the viscosity of cuticular lipids leads to increase permeability and diffusion of herbicides through the cuticle. Warmer temperature also reduce uptake of herbicides due to rapid drying of droplets. Increasing temperatures may mean an expansion of weeds into higher latitudes or higher altitudes.. Increased cuticle thickness and leaf pubescence in response to drought, will also reduce herbicide entry into leaves. At higher humidity leaf retention time of herbicides mainly hydrophilic increases. Blowing wind may cause spray drift or dry up the spray droplet. So there is need to pay special attention and to study the impact of climate factors on weed life, crop-weed competition and herbicide efficacy so that adaptation and mitigation strategies can be developed for changing climate. K e y w o r d sClimate changes, Natural process, Greenhouse effect, Environment.

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Respostas de plantas de Eleusine indica sob diferentes condições hídricas a herbicidas inibidores da ACCase

Cited by 10 publications

References 8 publications

Effect of water stress on herbicide efficiency applied to Urochloa decumbens

Effect of water stress on herbicide efficiency applied to Urochloa decumbens

Geographic Distribution of Ryegrass Resistent to the Clethodim Herbicide in Rio Grande do Sul1

Climate Change’s Impacts on Weeds and Herbicide Efficacy: A Review

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