Sistemas primários de transporte de prótons integram os mecanismos de desintoxicação do mesotrione em plantas de milho

Ogliari, Juares; Freitas, Suely Pereira; Ramos, Alessandro Coutinho; Smith, R.E. Bressan; Façanha, Arnoldo Rocha

doi:10.1590/s0100-83582009000400018

Cited by 7 publications

(11 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The higher Ic/Ac ratio in herbicide-treated plants indicates that plants fixed low CO2 concentrations in the substomatal chamber, showing that photosynthesis reduction is a result of damages during the photosynthetic process (Table 1). Ogliari et al (2009) noticed that the mesotrione herbicide reduced the photosynthetic rate in corn plants by 78% on the first, 66% on the second, and 75% on the third day after application relative to the control.…”

Section: Resultsmentioning

confidence: 97%

Physiologic characteristics of corn and Urochloa brizantha (Hochst. ex A. Rich.) R.D. Webster in intercropping cultivation

Rodrigues

Galvão²,

Ferreira

et al. 2014

Chilean J. Agric. Res.

View full text Add to dashboard Cite

Competition between weeds and crops results in a lower availability of some resources to crop species, which causes deficiencies, such as water and nutritional deficiencies and low light quality or quantity. The aims of this study were to evaluate the effects of Urochloa brizantha (Hochst. ex A. Rich.) R.D. Webster, cv. Xaraés (brachiaria) emergence times comparing with corn (Zea mays L.), in addition to the fertilization and application of different nicosulfuron and atrazine herbicides levels, on the physiological characteristics of intercropped species. The physiological characteristics Brachiaria plants that were treated with herbicides were negatively affected. The emergence time of Brachiaria plants in comparison with corn altered the physiological characteristics of both. The Brachiaria plants that emerged before corn presented higher photosynthetic and transpiration rates and reduced the intensity of these characteristics in corn. Thus, the Brachiaria plants that emerged before the corn crop presented a higher physiological efficiency, and they were more competitive than the weeds that emerged during other seasons.

show abstract

Section: Resultsmentioning

confidence: 97%

Physiologic characteristics of corn and Urochloa brizantha (Hochst. ex A. Rich.) R.D. Webster in intercropping cultivation

Rodrigues

Galvão²,

Ferreira

et al. 2014

Chilean J. Agric. Res.

View full text Add to dashboard Cite

show abstract

“…However, although mesotrione is a selective herbicide for use in maize, it can cause up to 35% intoxication (Bulegon et al, 2017), which is characterized by white spots in the new leaves of maize plants. Such spots become chlorotic and there is subsequent necrosis of the leaf tissue in the most extreme conditions (Barchanska et al, 2014), thereby interfering with crop plant metabolism (O'Sullivan et al, 2002;Ogliari et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Intoxication of Mesotrione in Corn Inoculated with Azospirillum brasilense and with Application of Plant Growth Regulators

et al. 2019

View full text Add to dashboard Cite

The objective of this study was to evaluate the effect of intoxication by mesotrione herbicide on the initial development and yield of maize after seed inoculation or foliar spray application with Azospirillum brasilense and application of plant regulators. Therefore, three experiments were performed: one under greenhouse conditions and two under field conditions, in different locations. In all experiments, a randomized block design was used with a 2 x 4 factorial arrangement, representing presence (192 g ha-1) or absence of mesotrione and four treatments corresponding to the control; seed inoculation with A. brasilense; foliar spray application of A. brasilense; foliar spay application of auxin + gibberellin + cytokine (AX + GA + CK), and foliar spay applications with mesotrione were carried out at the V3 stage of the crop. The results from the greenhouse experiment, with mesotrione application, were intoxication of 7.12%, which reduced total chlorophyll content by 10.15% and carotenoid content by 75.86%, leading to reductions in gas exchange and chlorophyll a fluorescence, and increased activity of antioxidative enzymes. Under field conditions, the treatments did not reduce the effects of intoxication during the initial development of maize crop and did not increase crop yield. It was concluded that the use of A. brasilense and plant regulators did not protect maize against mesotrione intoxication in the initial development, nor did it increase yield.

show abstract

“…Através da capacidade de metabolização rápida da molécula de mesotriona, em moléculas sem atividade herbicida, as plantas de milho apresentam tolerância a este herbicida. O sistema de desintoxicação se torna eficaz pela utilização de transportadores primários de H + (Ogliari et al, 2009). Apesar da tolerância do milho ao mesotriona, a aplicação deste herbicida causa o branqueamento ou amarelecimento em folha novas, devido a fotooxidação das moléculas de clorofila, reduzindo a atividade fotossintética, o que em cultivares menos tolerantes pode resultar na morte do tecido vegetal (Barchanska et al, 2014).…”

Section: Introductionunclassified

“…Tal condição está associada ao aumento da taxa de assimilação líquida de CO 2 em até 38% em plantas de cana-de-açúcar (Jin et al, 2015). Este incremento pode estar relacionado à eficiência de desintoxicação e recuperação de plantas de milho tratadas com mesotriona (Ogliari et al, 2009). Estudos envolvendo a combinação da aplicação de mesotriona e nitrogênio não elevaram os níveis de fitotoxidez no milho (Nicolai et al, 2006).…”

Section: Introductionunclassified

Fitotoxidez de mesotriona em milho inoculado com Azospirillum brasilense associado a adubação nitrogenada

Bulegon

Inagaki

Moratelli

et al. 2017

Agraria

View full text Add to dashboard Cite

RESUMOEste estudo objetivou avaliar a fitotoxidez do herbicida mesotriona no desenvolvimento inicial do milho inoculado com Azospirillum brasilense, associado à adubação nitrogenada. O delineamento utilizado foi o de blocos casualizados, em esquema fatorial 2x3, representado por milho com e sem aplicação do mesotriona (192 g ha) e os tratamentos: 1-inoculação das sementes com A. brasilense; 2-aplicação em cobertura de 140 kg ha -1 de N; e 3-A. brasilense + 140 kg ha -1 de N em cobertura aplicado aos 26 dias após a semeadura (DAS). A aplicação do mesotriona foi realizada aos 21 DAS, com avaliações realizadas por 28 dias após a aplicação (DAA). Aos 7 DAA constatou-se redução da taxa de assimilação líquida de CO 2 em 35% nas plantas que receberam aplicação de mesotriona, bem como aumento da atividade da peroxidase e maior degradação de carotenoides. Aos 14 DAA de mesotriona resultou em redução na taxa de assimilação líquida de CO 2 e na transpiração, enquanto aos 28 DAA foi verificado menor altura de plantas, área foliar e massa seca de parte aérea nas plantas com herbicida. A inoculação com A. brasilense + N elevou a atividade das peroxidases aos 7 DAA e auxiliou a manutenção da taxa transpiratória aos 14 DAA. Conclui-se que a inoculação com A. brasilense + N pode minimizar os efeitos danosos causados pelo mesotriona no desenvolvimento inicial do milho.Palavras-chave: bactérias promotoras de crescimento vegetal; herbicida; inibidor dos carotenoides; trocas gasosas Phytotoxicity of mesotriona in corn with Azospirillum brasilense associated nitrogen fertilization ABSTRACTThis study aimed to evaluate the phytotoxicity of the mesotrione herbicide in the initial development of maize inoculated with Azospirillum brasilense and associated with nitrogen fertilization. The treatments were: randomized blocks in a 2x3 factorial scheme, represented by maize with and without mesotrione application (192 g ha -1 ) and treatments: 1-inoculation of the seeds with A. brasilense; 2-Application in coverage of 140 kg ha -1 of N; And 3-A. brasilense + 140 kg ha-1 of N in cover applied at 26 days after sowing (DAS). The application of mesotrione was performed at 21 DAS, with evaluations performed up to 28 days after application (DAA). At 7 DAA a reduction of the net assimilation rate of CO 2 in 35% in the plants with mesotrione was observed, as well as increase of the peroxidases activity and greater degradation of carotenoids in the mesotrione plants. At 14 DAA the mesotrione reduced the rate of CO 2 net assimilation and transpiration, while at 28 DAA, lower plant height, leaf area and shoot dry mass were verified in herbicide plants. The inoculation with A. brasilense + N increased peroxidase activity at 7 DAA and helped maintain the transpiratory rate at 14 DAA. It is concluded that inoculation with A. brasilense + N can minimize the harmful effects caused by mesotrione in the initial development of corn.

show abstract

Sistemas primários de transporte de prótons integram os mecanismos de desintoxicação do mesotrione em plantas de milho

Cited by 7 publications

References 31 publications

Physiologic characteristics of corn and Urochloa brizantha (Hochst. ex A. Rich.) R.D. Webster in intercropping cultivation

Physiologic characteristics of corn and Urochloa brizantha (Hochst. ex A. Rich.) R.D. Webster in intercropping cultivation

Intoxication of Mesotrione in Corn Inoculated with Azospirillum brasilense and with Application of Plant Growth Regulators

Fitotoxidez de mesotriona em milho inoculado com Azospirillum brasilense associado a adubação nitrogenada

Contact Info

Product

Resources

About